2021/04/12 更新

写真a

ナルミ タカツネ
鳴海 敬倫
NARUMI Takatsune
所属
教育研究院 自然科学系 生産デザイン工学系列 教授
自然科学研究科 材料生産システム専攻 教授
工学部 工学科 教授
職名
教授
外部リンク

学位

  • 博士(工学) ( 1992年11月   東京工業大学 )

  • 工学修士 ( 1980年3月   新潟大学 )

研究分野

  • ものづくり技術(機械・電気電子・化学工学) / 流体工学  / 複雑流体

  • ナノテク・材料 / 複合材料、界面  / 機能性材料

経歴(researchmap)

  • 新潟大学   自然科学系(創生学部)   教授

    2017年4月 - 現在

      詳細を見る

  • 新潟大学   自然科学系(工学部)   教授

    2009年1月 - 現在

      詳細を見る

  • 新潟大学   自然科学系(工学部)   准教授

    2004年4月 - 2008年12月

      詳細を見る

  • シドニー大学   客員研究員

    1998年4月 - 1999年2月

      詳細を見る

  • 新潟大学   工学部   助教授

    1993年10月 - 2004年3月

      詳細を見る

  • 新潟大学   工学部   講師

    1992年10月 - 1993年9月

      詳細を見る

  • 新潟大学

    1992年 - 1993年

      詳細を見る

  • 新潟大学   工学部   助手

    1981年5月 - 1992年9月

      詳細を見る

  • Niigata University, Research Associate

    1981年 - 1992年

      詳細を見る

▶ 全件表示

経歴

  • 新潟大学   創生学部   教授

    2017年4月 - 現在

  • 新潟大学   工学部 工学科   教授

    2017年4月 - 現在

  • 新潟大学   自然科学研究科 材料生産システム専攻   教授

    2009年1月 - 現在

  • 新潟大学   機械システム工学科   教授

    2009年1月 - 2017年3月

  • 新潟大学   機械システム工学科   准教授

    2004年4月 - 2008年12月

  • 新潟大学   工学部   講師

    1992年1月 - 1993年9月

  • 新潟大学   工学部   助手

    1981年5月 - 1992年9月

▶ 全件表示

学歴

  • 新潟大学    

    1978年4月 - 1980年3月

      詳細を見る

    国名: 日本国

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  • 新潟大学   Graduate School, Division of Engineering  

    - 1980年

      詳細を見る

  • 新潟大学   工学部   機械工学科

    1974年4月 - 1978年3月

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    国名: 日本国

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  • 新潟大学   Faculty of Engineering  

    - 1978年

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所属学協会

▶ 全件表示

 

論文

  • 変形回復過程を用いたハイドロゲル微粒子の変形特性の算定 査読

    石井 治彦, 鳴海 敬倫, 鈴木 大介, 湊 遥香, 浦山 健治, 牛田 晃臣, 佐藤 大祐

    日本レオロジー学会誌,46 ( 5 ) 227 - 231   2018年12月

     詳細を見る

  • Pseudo-laminarization effect of dilute and ultra-dilute polymer solutions on flows in narrow pipes 査読

    Ushida Akiomi, Ogawa Shuichi, Narumi Takatsune, Sato Taisuke, Hasegawa Tomiichi

    EXPERIMENTAL THERMAL AND FLUID SCIENCE99   233 - 241   2018年12月

  • 変形回復過程を用いたハイドロゲル微粒子の変形特性の算定 査読

    石井 治彦, 鳴海 敬倫, 鈴木 大介, 湊 遥香, 浦山 健治, 牛田 晃臣, 佐藤 大祐

    日本レオロジー学会誌,46 ( 5 ) 227 - 231   2018年12月

     詳細を見る

  • Pseudo-laminarization effect of dilute and ultra-dilute polymer solutions on flows in narrow pipes 査読

    Ushida Akiomi, Ogawa Shuichi, Narumi Takatsune, Sato Taisuke, Hasegawa Tomiichi

    EXPERIMENTAL THERMAL AND FLUID SCIENCE99   233 - 241   2018年12月

  • Differential Response Pattern of Oropharyngeal Pressure by Bolus and Dry Swallows 査読

    Mana Hasegawa, Masayuki Kurose, Keiichiro Okamoto, Yoshiaki Yamada, Takanori Tsujimura, Makoto Inoue, Taisuke Sato, Takatsune Narumi, Noritaka Fujii, Kensuke Yamamura

    Dysphagia33 ( 1 ) 83 - 90   2018年2月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Springer New York LLC  

    The aim of this study was to determine if bolus and dry swallow showed similar pressure changes in the oropharynx using our newly developed device. A unique character of it includes that baropressure can be measured with the sensor being placed in the balloon and can assess the swallowing mechanics in terms of pressure changes in the oropharynx with less influences of direct contacts of boluses and oropharyngeal structures during swallow indirectly. Fifteen healthy subjects swallowed saliva (dry), 15 ml of water, 45 ml of water, and 15 ml of two different types of food in terms of viscosity (potage soup-type and mayonnaise-type foods). Suprahyoid muscle activity was recorded simultaneously. Three parameters, area under the curve (AUC), peak amplitude, and duration of pressure, were analyzed from each swallow. Almost all of the bolus swallowing events had biphasic baropressure responses consisting of an early phase and late phase (99%), whereas 90% of the saliva swallowing events had a single phase. AUC, peak, and duration displayed greater effects during the late phase than during the early phase. Baropressure of the early phase, but not of the late phase, significantly increased with increasing volume
    however, small but significant viscosity effects on pressure were seen during both phases. Peak pressure of the late phase was preceded by maximum muscle activity, whereas that of the early phase was seen when muscle activity displayed a peak response. These findings indicated that our device with the ability to measure baropressure has the potential to provide additional parameter to assess the swallow physiology, and biphasic baropressure responses in the early and late phases could reflect functional aspects of the swallowing reflexes.

    DOI: 10.1007/s00455-017-9836-9

    Web of Science

    Scopus

    PubMed

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  • Differential Response Pattern of Oropharyngeal Pressure by Bolus and Dry Swallows 査読

    Mana Hasegawa, Masayuki Kurose, Keiichiro Okamoto, Yoshiaki Yamada, Takanori Tsujimura, Makoto Inoue, Taisuke Sato, Takatsune Narumi, Noritaka Fujii, Kensuke Yamamura

    Dysphagia33 ( 1 ) 83 - 90   2018年2月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Springer New York LLC  

    The aim of this study was to determine if bolus and dry swallow showed similar pressure changes in the oropharynx using our newly developed device. A unique character of it includes that baropressure can be measured with the sensor being placed in the balloon and can assess the swallowing mechanics in terms of pressure changes in the oropharynx with less influences of direct contacts of boluses and oropharyngeal structures during swallow indirectly. Fifteen healthy subjects swallowed saliva (dry), 15 ml of water, 45 ml of water, and 15 ml of two different types of food in terms of viscosity (potage soup-type and mayonnaise-type foods). Suprahyoid muscle activity was recorded simultaneously. Three parameters, area under the curve (AUC), peak amplitude, and duration of pressure, were analyzed from each swallow. Almost all of the bolus swallowing events had biphasic baropressure responses consisting of an early phase and late phase (99%), whereas 90% of the saliva swallowing events had a single phase. AUC, peak, and duration displayed greater effects during the late phase than during the early phase. Baropressure of the early phase, but not of the late phase, significantly increased with increasing volume
    however, small but significant viscosity effects on pressure were seen during both phases. Peak pressure of the late phase was preceded by maximum muscle activity, whereas that of the early phase was seen when muscle activity displayed a peak response. These findings indicated that our device with the ability to measure baropressure has the potential to provide additional parameter to assess the swallow physiology, and biphasic baropressure responses in the early and late phases could reflect functional aspects of the swallowing reflexes.

    DOI: 10.1007/s00455-017-9836-9

    Web of Science

    Scopus

    PubMed

    researchmap

  • Anomalous Flow Properties of Several Types of Rod-Like Micelle Surfactant Solutions Passing through Small Apertures 査読

    Ushida Akiomi, Ogata Naoki, Sato Taisuke, Narumi Takatsune, Hasegawa Tomiichi

    NIHON REOROJI GAKKAISHI46 ( 2 ) 99 - 106   2018年

  • Anomalous Flow Properties of Several Types of Rod-Like Micelle Surfactant Solutions Passing through Small Apertures 査読

    Ushida Akiomi, Ogata Naoki, Sato Taisuke, Narumi Takatsune, Hasegawa Tomiichi

    NIHON REOROJI GAKKAISHI46 ( 2 ) 99 - 106   2018年

  • Deformation Characteristics of Cultured Single Viable Cells by Squeezing Tests 査読

    Ishii Haruhiko, Ishii Tatsuji, Narumi Takatsune, Izumi Kenji, Ushida Akiomi, Sato Taisuke

    NIHON REOROJI GAKKAISHI46 ( 4 ) 179 - 184   2018年

  • Deformation Characteristics of Cultured Single Viable Cells by Squeezing Tests 査読

    Ishii Haruhiko, Ishii Tatsuji, Narumi Takatsune, Izumi Kenji, Ushida Akiomi, Sato Taisuke

    NIHON REOROJI GAKKAISHI46 ( 4 ) 179 - 184   2018年

  • Antimicrobial effectiveness of ultra-fine ozone-rich bubble mixtures for fresh vegetables using an alternating flow 査読

    Akiomi Ushida, Takahiro Koyama, Yoshinori Nakamoto, Takatsune Narumi, Taisuke Sato, Tomiichi Hasegawa

    JOURNAL OF FOOD ENGINEERING206   48 - 56   2017年8月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCI LTD  

    The consumption of fresh vegetables has been increasing in part owing to an increase in awareness of their health benefits. Chemicals are used for washing fresh vegetables in washing fresh vegetables to remove surface micro-organisms. However, the effect of these chemicals on human health must be considered, and the chemical concentrations used should be minimal. Previous studies have examined washing fresh vegetables with electrolyzed water, fine bubbles, and ultra-fine bubbles with strong mechanical action. A technique using fine and ultra-fine bubbles containing ozone and chlorine has also been developed. Although the efficiency of these techniques for washing fresh vegetable was high, the observations of fine and ultra-fine bubbles were limited. In the present study, the effect of fine and ultra fine bubbles on the washing rate of fresh vegetables in an alternating flow, which has a stronger mechanical action for washing, was investigated. Although all results in no mechanical action were the almost same(= 6.1 log cfu/g), the difference between the washing result (5.9 log cfu/g) for deionized water and those (5.3 log cfu/g) for ultra-fine bubble was obtained in an alternating flow. Moreover, the resultant viable bacterial count (3.7 log cfu/g) for ultra-fine ozone-rich bubble was less than that (4.6 log cfu/g) for sodium hypochlorite alone. There were substantial differences between washing with deionized water alone and with ultra-fine (ozone-rich) bubble mixtures. Stronger washing effects were obtained when ultra-fine (ozone-rich) bubble mixtures were combined with an alternating flow. Furthermore, surface tension, free radicals, mechanical action, and limitation of the effect was discussed for understanding the experimental results. (C) 2017 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jfoodeng.2017.03.003

    Web of Science

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  • Antimicrobial effectiveness of ultra-fine ozone-rich bubble mixtures for fresh vegetables using an alternating flow 査読

    Akiomi Ushida, Takahiro Koyama, Yoshinori Nakamoto, Takatsune Narumi, Taisuke Sato, Tomiichi Hasegawa

    JOURNAL OF FOOD ENGINEERING206   48 - 56   2017年8月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCI LTD  

    The consumption of fresh vegetables has been increasing in part owing to an increase in awareness of their health benefits. Chemicals are used for washing fresh vegetables in washing fresh vegetables to remove surface micro-organisms. However, the effect of these chemicals on human health must be considered, and the chemical concentrations used should be minimal. Previous studies have examined washing fresh vegetables with electrolyzed water, fine bubbles, and ultra-fine bubbles with strong mechanical action. A technique using fine and ultra-fine bubbles containing ozone and chlorine has also been developed. Although the efficiency of these techniques for washing fresh vegetable was high, the observations of fine and ultra-fine bubbles were limited. In the present study, the effect of fine and ultra fine bubbles on the washing rate of fresh vegetables in an alternating flow, which has a stronger mechanical action for washing, was investigated. Although all results in no mechanical action were the almost same(= 6.1 log cfu/g), the difference between the washing result (5.9 log cfu/g) for deionized water and those (5.3 log cfu/g) for ultra-fine bubble was obtained in an alternating flow. Moreover, the resultant viable bacterial count (3.7 log cfu/g) for ultra-fine ozone-rich bubble was less than that (4.6 log cfu/g) for sodium hypochlorite alone. There were substantial differences between washing with deionized water alone and with ultra-fine (ozone-rich) bubble mixtures. Stronger washing effects were obtained when ultra-fine (ozone-rich) bubble mixtures were combined with an alternating flow. Furthermore, surface tension, free radicals, mechanical action, and limitation of the effect was discussed for understanding the experimental results. (C) 2017 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jfoodeng.2017.03.003

    Web of Science

    researchmap

  • Investigation of Screen Printed Micro-Electrodes and Paste Rheology 査読

    Noriyuki Sakai, Takatsune Narumi, Ryutaro Takahashi, Akiomi Ushida

    NIHON REOROJI GAKKAISHI45 ( 4 ) 167 - 173   2017年

     詳細を見る

    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    This study examines the relationship between paste properties and screen-printing phenomena. Since the printing includes multiple processes those are generated almost simultaneously, it is necessary to investigate respective processes. In this report, we have focused transfer printing processes from the screen to a substrate. We have tested model silver pastes with different surface treatment to the silver particles. Several kinds of rheological properties of test pastes were measured and results of model printing experiments and real fine line electrode printings were correlated to the properties. It was found that the shear stress characteristics in the bulk form did not directly relate to printing performance and the other factors, such as oil absorption volume which affected flowability of the paste surface, must be further important. The study also confirmed that the tendency in oil absorption volume agreed with the conventional size electrode printing performance. But, paste residual phenomena was generated in the case of ultrafine line printing with 30 pm width and printing performance was influenced with other factors because of very narrow gap generated with a mesh and open area in the screen.

    DOI: 10.1678/rheology.45.167

    Web of Science

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  • Development of Engineering Education Program for Students before Starting Graduation Researches on Forefront Technologies 査読

    Tetsuo Oka, Takamasa Suzuki, Kazuhisa Abe, Takeshi Yamauchi, Kazuaki Yamagiwa, Takashi Sato, Yuji Tanabe, Takatsune Narumi

    2017 7TH WORLD ENGINEERING EDUCATION FORUM (WEEF)   136 - 139   2017年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    The university students from freshman to junior grades before starting their graduation studies have participated in the forefront researches conducted in the academic/scientific research laboratories in Niigata University. Since the practical research activities conducted in the laboratories must intrinsically contain the educational elements for the university students, it should be effective for the students to obtain the proper skills, abilities, attitudes, and knowledge of engineering even before the acquisition of their basic skills and knowledge of science. This education program called "Smart Dormitory" project has been carried out as one of the novel educational reform activities. There, the students from the freshman to junior make their teams together, and studies the forefront scientific researches about the topics they freely chose. In the process, the students have been assigned the scientific presentations about the results of their on-going investigations in the international meetings, which have been held in the domestic areas or overseas. The students are well motivated to their scientific researches through the presentations when they were given the opportunities in their early stage of university life. This engineering education program is characterized as one of the leadership programs for the scientific engineering leaders in the internationalized practical industries. Actually, the averaged academic score of dormitory students has firmly raised through the planned period, which means the program stimulated the student' motivation to their academic studies.

    Web of Science

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  • Development of Engineering Education Program for Students before Starting Graduation Researches on Forefront Technologies 査読

    Tetsuo Oka, Takamasa Suzuki, Kazuhisa Abe, Takeshi Yamauchi, Kazuaki Yamagiwa, Takashi Sato, Yuji Tanabe, Takatsune Narumi

    2017 7TH WORLD ENGINEERING EDUCATION FORUM (WEEF)   136 - 139   2017年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    The university students from freshman to junior grades before starting their graduation studies have participated in the forefront researches conducted in the academic/scientific research laboratories in Niigata University. Since the practical research activities conducted in the laboratories must intrinsically contain the educational elements for the university students, it should be effective for the students to obtain the proper skills, abilities, attitudes, and knowledge of engineering even before the acquisition of their basic skills and knowledge of science. This education program called "Smart Dormitory" project has been carried out as one of the novel educational reform activities. There, the students from the freshman to junior make their teams together, and studies the forefront scientific researches about the topics they freely chose. In the process, the students have been assigned the scientific presentations about the results of their on-going investigations in the international meetings, which have been held in the domestic areas or overseas. The students are well motivated to their scientific researches through the presentations when they were given the opportunities in their early stage of university life. This engineering education program is characterized as one of the leadership programs for the scientific engineering leaders in the internationalized practical industries. Actually, the averaged academic score of dormitory students has firmly raised through the planned period, which means the program stimulated the student' motivation to their academic studies.

    Web of Science

    researchmap

  • Effect of Fluid Properties on Flow-induced Orientational Changes of Polymer Solutions in a Planar Channel with an Abrupt Expansion 査読

    Shota Yanagiya, Takatsune Narumi, Taisuke Sato, Akiomi Ushida

    NIHON REOROJI GAKKAISHI45 ( 2 ) 125 - 132   2017年

     詳細を見る

    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Flow-induced orientational changes of xanthan gum aqueous solutions and hydroxypropyl cellulose aqueous solutions in a planar channel with an abrupt expansion were examined by measurements of the flow-induced birefringence changes and velocity fields along the centerline of the channel. Four kinds of the xanthan gum (X-gum, M-w > 2,000,000) solutions with different concentrations (0.45 0.5 0.7 0.9 wt%) and two kinds of the hydroxypropyl cellulose solutions with different molecular weights (HPC-M, M-w = 620,000 / HPC-H, M-w = 910,000) were tested in this experiment. Characteristic times were evaluated from G' and G" curves respectively. The birefringence changes were delayed corresponding to the characteristic times. Typical sizes of regions where the flow structure of polymers were affected by the abrupt expansion were estimated with the birefringence changes. The normalized sizes have a good correlation with a viscoelastic factor (apparent Weissenberg number) estimated in upstream region regardless of the concentrations of the solutions nor the polymer types.

    DOI: 10.1678/rheology.45.125

    Web of Science

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  • Effect of Fluid Properties on Flow-induced Orientational Changes of Polymer Solutions in a Planar Channel with an Abrupt Expansion 査読

    Shota Yanagiya, Takatsune Narumi, Taisuke Sato, Akiomi Ushida

    NIHON REOROJI GAKKAISHI45 ( 2 ) 125 - 132   2017年

     詳細を見る

    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Flow-induced orientational changes of xanthan gum aqueous solutions and hydroxypropyl cellulose aqueous solutions in a planar channel with an abrupt expansion were examined by measurements of the flow-induced birefringence changes and velocity fields along the centerline of the channel. Four kinds of the xanthan gum (X-gum, M-w > 2,000,000) solutions with different concentrations (0.45 0.5 0.7 0.9 wt%) and two kinds of the hydroxypropyl cellulose solutions with different molecular weights (HPC-M, M-w = 620,000 / HPC-H, M-w = 910,000) were tested in this experiment. Characteristic times were evaluated from G' and G" curves respectively. The birefringence changes were delayed corresponding to the characteristic times. Typical sizes of regions where the flow structure of polymers were affected by the abrupt expansion were estimated with the birefringence changes. The normalized sizes have a good correlation with a viscoelastic factor (apparent Weissenberg number) estimated in upstream region regardless of the concentrations of the solutions nor the polymer types.

    DOI: 10.1678/rheology.45.125

    Web of Science

    researchmap

  • Investigation of Screen Printed Micro-Electrodes and Paste Rheology 査読

    Noriyuki Sakai, Takatsune Narumi, Ryutaro Takahashi, Akiomi Ushida

    NIHON REOROJI GAKKAISHI45 ( 4 ) 167 - 173   2017年

     詳細を見る

    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    This study examines the relationship between paste properties and screen-printing phenomena. Since the printing includes multiple processes those are generated almost simultaneously, it is necessary to investigate respective processes. In this report, we have focused transfer printing processes from the screen to a substrate. We have tested model silver pastes with different surface treatment to the silver particles. Several kinds of rheological properties of test pastes were measured and results of model printing experiments and real fine line electrode printings were correlated to the properties. It was found that the shear stress characteristics in the bulk form did not directly relate to printing performance and the other factors, such as oil absorption volume which affected flowability of the paste surface, must be further important. The study also confirmed that the tendency in oil absorption volume agreed with the conventional size electrode printing performance. But, paste residual phenomena was generated in the case of ultrafine line printing with 30 pm width and printing performance was influenced with other factors because of very narrow gap generated with a mesh and open area in the screen.

    DOI: 10.1678/rheology.45.167

    Web of Science

    researchmap

  • Anomalous flow properties of spherical micelle surfactant solutions passing through small-sized slits 査読

    Akiomi Ushida, Takatsune Narumi, Keiko Amaki, Taisuke Sato, Tomiichi Hasegawa

    INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW61   562 - 574   2016年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE INC  

    The flow properties of complex fluids, such as aqueous solutions of polymers and surfactants, have been investigated in many studies, which revealed interesting and anomalous tendencies for several types of complex fluids in abrupt contraction and expansion flows, such as flows passing through small-sized orifices and slits. In the study, the jet thrust and excess pressure drop (net differential pressure) for experimentally observing their flow properties of water and aqueous solutions of several types of surfactants with spherical micelles in slit flows were measured. Different properties were observed for various surfactant solutions depending on the charge of the solute. The resultant jet thrust and excess pressure drop of cationic and non-ionic surfactant solutions were lower than the experimental values of water. For anionic surfactant solutions, the experimental results were similar to those of water. The types can be arranged as cationic > non-ionic > anionic in order of diminishing the jet thrust and excess pressure drop. Moreover, the effect of strong strain, boundary slip, contraction ratio, size effect, concentration, and interface phenomena was discussed. (C) 2016 Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.ijheatfluidflow.2016.07.002

    Web of Science

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  • Anomalous flow properties of spherical micelle surfactant solutions passing through small-sized slits 査読

    Akiomi Ushida, Takatsune Narumi, Keiko Amaki, Taisuke Sato, Tomiichi Hasegawa

    INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW61   562 - 574   2016年10月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE INC  

    The flow properties of complex fluids, such as aqueous solutions of polymers and surfactants, have been investigated in many studies, which revealed interesting and anomalous tendencies for several types of complex fluids in abrupt contraction and expansion flows, such as flows passing through small-sized orifices and slits. In the study, the jet thrust and excess pressure drop (net differential pressure) for experimentally observing their flow properties of water and aqueous solutions of several types of surfactants with spherical micelles in slit flows were measured. Different properties were observed for various surfactant solutions depending on the charge of the solute. The resultant jet thrust and excess pressure drop of cationic and non-ionic surfactant solutions were lower than the experimental values of water. For anionic surfactant solutions, the experimental results were similar to those of water. The types can be arranged as cationic > non-ionic > anionic in order of diminishing the jet thrust and excess pressure drop. Moreover, the effect of strong strain, boundary slip, contraction ratio, size effect, concentration, and interface phenomena was discussed. (C) 2016 Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.ijheatfluidflow.2016.07.002

    Web of Science

    researchmap

  • Is the water flow more or less than that predicted by the Navier-Stokes equation in micro-orifices? 査読

    Tomiichi Hasegawa, Akiomi Ushida, Takatsune Narumi, Masaki Goda

    PHYSICS OF FLUIDS28 ( 9 )   2016年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER INST PHYSICS  

    Micro-fluid mechanics is an important field in modern fluid mechanics. However, flows through microscale short tubes (micro-orifices) are not yet fully understood. Thus far, experiments on the flow through micro-orifices have been conducted by two methods: the pressure-given method (PGM), in which the pressure is given and the rate of flow is measured, and the flow-given method (FGM), in which the flow rate is given and the pressure is measured. According to conventional fluid mechanics, these two methods should give the same result; however, studies have found lower fluidity (lower flow rate) in PGM and higher fluidity (lower pressure drop) in FGM than that predicted by the Navier-Stokes equation, suggesting that the difference is caused by the method used. To clarify the cause of this difference, we examined the flow of ultra-pure water (UPW) with elapsed time by PGM. UPW was passed through Ni or Ti micro-orifices with 20-mu m diameter at applied pressures of 50-1000 Pa. The difference in the shape and material of the orifices did not have a great effect on the flow property. The flow rate was frequently higher than that predicted at the start of the flow experiment; however, it subsequently fell and finally reached zero as time elapsed. This fact suggests that UPW inherently flows at velocities higher than those predicted by the Navier-Stokes equation; however, the flow is then resisted by something that develops over time. We removed an orifice in which flow had stopped from the experimental apparatus, observed it by phase contrast microscope and electron probe micro analyzer, and revealed that a visible membrane, a transparent lattice-like structure, or nothing existed in the orifice. Dissolved air was reduced by deaerating the air from UPW (deaeration), bubbling UPW with Ar (Ar-bubbling), or preventing UPW from contact with air after UPW production (air-prevention). Deaeration, Ar-bubbling, and air-prevention reduced the probability of formation of the visible membrane. UPW treated by a combination of air-prevention and Ar-bubbling showed no visible membrane. Furthermore, we passed UPW through an electrically grounded orifice (grounding) and found that grounding also reduces the probability of formation of the visible membrane. These findings suggest that the membrane formation was related to the presence of air dissolved in UPW and the action of charges generated in the flow. The reduction of the dissolved air by Ar-bubbling and air-prevention provided a higher flow rate, although deaeration provided a slightly lower flow rate than seen in the case without deaeration. Grounding yielded a higher average flow rate. A combination of Ar-bubbling and grounding provided flow rates considerably larger than the predicted ones. We found a correlation between the probability of the membrane formation and the magnitude of the fall in flow rates. We concluded that the membranes, whether visible or invisible, came from the dissolved air by the action of charges generated at the orifice by the flow. Furthermore, the membrane developed naturally in PGM; in contrast, the membrane, even if it developed, was flushed away from the orifice in FGM because of the constant flow supplied. Therefore, the UPW flows in PGM with fluidity lower than the predicted value owing to the resistance of the membrane, whereas the UPW flows in FGM with fluidity higher than the predicted value owing to the inherent characteristics of UPW. Published by AIP Publishing.

    DOI: 10.1063/1.4962304

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  • Is the water flow more or less than that predicted by the Navier-Stokes equation in micro-orifices? 査読

    Tomiichi Hasegawa, Akiomi Ushida, Takatsune Narumi, Masaki Goda

    PHYSICS OF FLUIDS28 ( 9 )   2016年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER INST PHYSICS  

    Micro-fluid mechanics is an important field in modern fluid mechanics. However, flows through microscale short tubes (micro-orifices) are not yet fully understood. Thus far, experiments on the flow through micro-orifices have been conducted by two methods: the pressure-given method (PGM), in which the pressure is given and the rate of flow is measured, and the flow-given method (FGM), in which the flow rate is given and the pressure is measured. According to conventional fluid mechanics, these two methods should give the same result; however, studies have found lower fluidity (lower flow rate) in PGM and higher fluidity (lower pressure drop) in FGM than that predicted by the Navier-Stokes equation, suggesting that the difference is caused by the method used. To clarify the cause of this difference, we examined the flow of ultra-pure water (UPW) with elapsed time by PGM. UPW was passed through Ni or Ti micro-orifices with 20-mu m diameter at applied pressures of 50-1000 Pa. The difference in the shape and material of the orifices did not have a great effect on the flow property. The flow rate was frequently higher than that predicted at the start of the flow experiment; however, it subsequently fell and finally reached zero as time elapsed. This fact suggests that UPW inherently flows at velocities higher than those predicted by the Navier-Stokes equation; however, the flow is then resisted by something that develops over time. We removed an orifice in which flow had stopped from the experimental apparatus, observed it by phase contrast microscope and electron probe micro analyzer, and revealed that a visible membrane, a transparent lattice-like structure, or nothing existed in the orifice. Dissolved air was reduced by deaerating the air from UPW (deaeration), bubbling UPW with Ar (Ar-bubbling), or preventing UPW from contact with air after UPW production (air-prevention). Deaeration, Ar-bubbling, and air-prevention reduced the probability of formation of the visible membrane. UPW treated by a combination of air-prevention and Ar-bubbling showed no visible membrane. Furthermore, we passed UPW through an electrically grounded orifice (grounding) and found that grounding also reduces the probability of formation of the visible membrane. These findings suggest that the membrane formation was related to the presence of air dissolved in UPW and the action of charges generated in the flow. The reduction of the dissolved air by Ar-bubbling and air-prevention provided a higher flow rate, although deaeration provided a slightly lower flow rate than seen in the case without deaeration. Grounding yielded a higher average flow rate. A combination of Ar-bubbling and grounding provided flow rates considerably larger than the predicted ones. We found a correlation between the probability of the membrane formation and the magnitude of the fall in flow rates. We concluded that the membranes, whether visible or invisible, came from the dissolved air by the action of charges generated at the orifice by the flow. Furthermore, the membrane developed naturally in PGM; in contrast, the membrane, even if it developed, was flushed away from the orifice in FGM because of the constant flow supplied. Therefore, the UPW flows in PGM with fluidity lower than the predicted value owing to the resistance of the membrane, whereas the UPW flows in FGM with fluidity higher than the predicted value owing to the inherent characteristics of UPW. Published by AIP Publishing.

    DOI: 10.1063/1.4962304

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  • Pseudo-laminarization effect of several types of surfactant solutions in small-sized pipe flows 査読

    Akiomi Ushida, Akira Ichijo, Taisuke Sato, Tomiichi Hasegawa, Takatsune Narumi

    ACTA MECHANICA227 ( 8 ) 2061 - 2074   2016年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER WIEN  

    Fluid mechanics at a very small scale, particularly micro-flows and nano-flows, have many technical applications, and the elastic properties of small-scale flows are strongly expressed even for dilute aqueous solutions of non-Newtonian fluids. We have investigated the flow properties of water and several types of surfactant solutions with spherical or rod-like micelles. Before the flow property investigations, Newtonian and non-Newtonian viscosities for the test fluids were observed by using a capillary viscosity meter. Pressure drops were experimentally measured, and the frictional coefficient of the pipe was estimated in flows through capillaries ranging from 133 m to 2.87 mm in diameter. For water flow, good agreement was obtained between the experimental results and the predictions for Hagen-Poiseuille flow and the Blasius expression. The flow properties of the spherical micelle surfactant solutions agreed with those of water. However, the rod-like micelle surfactant solutions maintained laminar flows in the transition regions. Thus, a pseudo-laminarization effect for surfactant solutions with rod-like micelles is indicated. A relationship between these experimental results and estimated first normal stress differences is also strongly suggested.

    DOI: 10.1007/s00707-016-1616-3

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  • Pseudo-laminarization effect of several types of surfactant solutions in small-sized pipe flows 査読

    Akiomi Ushida, Akira Ichijo, Taisuke Sato, Tomiichi Hasegawa, Takatsune Narumi

    ACTA MECHANICA227 ( 8 ) 2061 - 2074   2016年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER WIEN  

    Fluid mechanics at a very small scale, particularly micro-flows and nano-flows, have many technical applications, and the elastic properties of small-scale flows are strongly expressed even for dilute aqueous solutions of non-Newtonian fluids. We have investigated the flow properties of water and several types of surfactant solutions with spherical or rod-like micelles. Before the flow property investigations, Newtonian and non-Newtonian viscosities for the test fluids were observed by using a capillary viscosity meter. Pressure drops were experimentally measured, and the frictional coefficient of the pipe was estimated in flows through capillaries ranging from 133 m to 2.87 mm in diameter. For water flow, good agreement was obtained between the experimental results and the predictions for Hagen-Poiseuille flow and the Blasius expression. The flow properties of the spherical micelle surfactant solutions agreed with those of water. However, the rod-like micelle surfactant solutions maintained laminar flows in the transition regions. Thus, a pseudo-laminarization effect for surfactant solutions with rod-like micelles is indicated. A relationship between these experimental results and estimated first normal stress differences is also strongly suggested.

    DOI: 10.1007/s00707-016-1616-3

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  • Microfluidic mixing using unsteady electroosmotic vortices produced by a staggered array of electrodes 査読

    Koji Matsubara, Takatsune Narumi

    CHEMICAL ENGINEERING JOURNAL288   638 - 647   2016年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    This paper proposes the improvement of microfluidic mixture using the unsteady electroosmotic vortices induced by a staggered array of electrodes. The unsteady electroosmotic forces near two walls, having opposite directions near two walls, were shown to drive organized vortices to contribute for the enhanced mixing. Examination was given to the flow field involving unsteady vortices and their role for the particle mixing. Numerical simulation was made to evaluate the particle mixing process and to reveal how the particle mixing occurred under influence of disturbance by unsteady vortices. The Reynolds number was set to 0.005 and 1.0 changing the oscillation frequency and the electric field intensity. Efficiency of particle mixing was evaluated by the variance intensity of particle number fraction. The agreement between the simulation for the steady electroosmotic flow and the existing paper, and the grid convergence vindicated the simulation code presently used. The numerical results for unsteady electroosmotic flow demonstrated that the particle mixing was controlled by the oscillation frequency and the balanced time scales of the flow perturbation and convection was essential to the particle mixing. The particle flow was displayed to discuss the phenomenology related to the particle mixing. This revealed that the intermingling of particles within main and secondary vortices crucial for the mixing process whereas the outside streams exerted by the vortices were not effective on it. (C) 2015 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.cej.2015.12.013

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  • Microfluidic mixing using unsteady electroosmotic vortices produced by a staggered array of electrodes 査読

    Koji Matsubara, Takatsune Narumi

    CHEMICAL ENGINEERING JOURNAL288   638 - 647   2016年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    This paper proposes the improvement of microfluidic mixture using the unsteady electroosmotic vortices induced by a staggered array of electrodes. The unsteady electroosmotic forces near two walls, having opposite directions near two walls, were shown to drive organized vortices to contribute for the enhanced mixing. Examination was given to the flow field involving unsteady vortices and their role for the particle mixing. Numerical simulation was made to evaluate the particle mixing process and to reveal how the particle mixing occurred under influence of disturbance by unsteady vortices. The Reynolds number was set to 0.005 and 1.0 changing the oscillation frequency and the electric field intensity. Efficiency of particle mixing was evaluated by the variance intensity of particle number fraction. The agreement between the simulation for the steady electroosmotic flow and the existing paper, and the grid convergence vindicated the simulation code presently used. The numerical results for unsteady electroosmotic flow demonstrated that the particle mixing was controlled by the oscillation frequency and the balanced time scales of the flow perturbation and convection was essential to the particle mixing. The particle flow was displayed to discuss the phenomenology related to the particle mixing. This revealed that the intermingling of particles within main and secondary vortices crucial for the mixing process whereas the outside streams exerted by the vortices were not effective on it. (C) 2015 Elsevier B.V. All rights reserved.

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  • Anomaly of pressure drops of rod-like micelle surfactant solutions passing through small orifices 査読

    Akiomi Ushida, Shotaro Murao, Tomiichi Hasegawa, Takatsune Narumi, Keiko Arnaki

    EXPERIMENTAL THERMAL AND FLUID SCIENCE70   69 - 76   2016年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE INC  

    The flow properties of water and surfactant solutions mixed with counter ions were investigated in flows through small orifices. Good agreement between the resultant pressure drops of water and the numerical predictions of the Navier Stokes equations was obtained. Compared with those of water, the pressure drops of surfactant solutions were larger for molar concentration ratios of 1.0. Moreover, an anomalous flow pattern was observed in the flows through a slot channel: an unstable vortex and unsteady flow were found before the slot for a molar concentration ratio of 1.0, whereas a steady flow pattern was observed for a molar concentration ratio of 10.0. Thus, we conclude that the anomalous pressure drops for surfactant solutions were caused by the unsteady flows. (C) 2015 Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.expthermflusci.2015.07.024

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  • Anomaly of pressure drops of rod-like micelle surfactant solutions passing through small orifices 査読

    Akiomi Ushida, Shotaro Murao, Tomiichi Hasegawa, Takatsune Narumi, Keiko Arnaki

    EXPERIMENTAL THERMAL AND FLUID SCIENCE70   69 - 76   2016年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE INC  

    The flow properties of water and surfactant solutions mixed with counter ions were investigated in flows through small orifices. Good agreement between the resultant pressure drops of water and the numerical predictions of the Navier Stokes equations was obtained. Compared with those of water, the pressure drops of surfactant solutions were larger for molar concentration ratios of 1.0. Moreover, an anomalous flow pattern was observed in the flows through a slot channel: an unstable vortex and unsteady flow were found before the slot for a molar concentration ratio of 1.0, whereas a steady flow pattern was observed for a molar concentration ratio of 10.0. Thus, we conclude that the anomalous pressure drops for surfactant solutions were caused by the unsteady flows. (C) 2015 Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.expthermflusci.2015.07.024

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  • Effect of Cross-Sectional Aspect Ratio on Flow-Induced Orientation of a Polymer Solution in Planar Channels with an Abrupt Expansion 査読

    Taisuke Sato, Takatsune Narumi, Kazunori Yasuda, Akiomi Ushida, Ryuichi Kayaba

    NIHON REOROJI GAKKAISHI44 ( 2 ) 109 - 116   2016年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Flow-induced orientational changes in a 0.5 wt % Xanthan gum solution in planar channels with an abrupt expansion were examined by measurement of the flow-induced birefringence and velocity fields. Three kinds of 1:4 abrupt expansion channels with different cross-sectional aspect ratios (of 1, 2, and 5) in the upstream region were tested in the experiments. A similar channel with a different size but the same aspect ratio of 1 was tested for comparison. Remarkable differences were found in the development of flow-induced orientation near the centerline after the abrupt expansion, depending on the aspect ratio. In the cases of the aspect ratios of I and 2, the polymer molecules were temporally aligned perpendicular to the flow direction due to negative elongational flows generated after the abrupt expansion. In contrast, similar phenomena were not observed with an aspect ratio of 5. From these results, the typical flow-induced orientational changes in polymers in the planar channels just after the abrupt expansion were found to be substantially affected by the cross-sectional aspect ratio in the upstream region.

    DOI: 10.1678/rheology.44.109

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  • Flow Properties of Microbubble Mixtures and Complex Fluids Passing through Micro-Apertures 査読

    Akiomi Ushida, Tomiichi Hasegawa, Taisuke Sato, Takatsune Narumi

    NIHON REOROJI GAKKAISHI44 ( 3 ) 119 - 129   2016年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    The pressure drops were measured for water, microbubble/water mixtures, and complex fluids (spherical micelle surfactant solution and polymer solution) in flows through micro-apertures (micro-orifices, circular pores, and hexagonal pores). For water, agreement between the resultant pressure drops and the predictions of the Navier-Stokes equation was obtained. For microbubble/water mixtures, drag reduction effect was suggested over a Reynolds number of about 1.0 x 10(1) in micro-orifice flows. Surfactant solutions exhibited the same results as microbubble/water mixtures. For polymer solutions, significant drag reduction was shown. Moreover, a drag reduction effect, which was independent of the used test fluids, was observed for Reynolds numbers over 1.0 x 10(1) in the flow through circular pores and hexagonal pores. To explain this phenomenon, the size effect, visco-elastic property, electric interaction, and interfacial tension are considered. The results suggest that electric interaction at the wall (interfacial tension) is a contributing factor. In addition, drag reduction rates were estimated.

    DOI: 10.1678/rheology.44.119

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  • Effect of Cross-Sectional Aspect Ratio on Flow-Induced Orientation of a Polymer Solution in Planar Channels with an Abrupt Expansion 査読

    Taisuke Sato, Takatsune Narumi, Kazunori Yasuda, Akiomi Ushida, Ryuichi Kayaba

    NIHON REOROJI GAKKAISHI44 ( 2 ) 109 - 116   2016年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Flow-induced orientational changes in a 0.5 wt % Xanthan gum solution in planar channels with an abrupt expansion were examined by measurement of the flow-induced birefringence and velocity fields. Three kinds of 1:4 abrupt expansion channels with different cross-sectional aspect ratios (of 1, 2, and 5) in the upstream region were tested in the experiments. A similar channel with a different size but the same aspect ratio of 1 was tested for comparison. Remarkable differences were found in the development of flow-induced orientation near the centerline after the abrupt expansion, depending on the aspect ratio. In the cases of the aspect ratios of I and 2, the polymer molecules were temporally aligned perpendicular to the flow direction due to negative elongational flows generated after the abrupt expansion. In contrast, similar phenomena were not observed with an aspect ratio of 5. From these results, the typical flow-induced orientational changes in polymers in the planar channels just after the abrupt expansion were found to be substantially affected by the cross-sectional aspect ratio in the upstream region.

    DOI: 10.1678/rheology.44.109

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  • Flow Properties of Microbubble Mixtures and Complex Fluids Passing through Micro-Apertures 査読

    Akiomi Ushida, Tomiichi Hasegawa, Taisuke Sato, Takatsune Narumi

    NIHON REOROJI GAKKAISHI44 ( 3 ) 119 - 129   2016年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    The pressure drops were measured for water, microbubble/water mixtures, and complex fluids (spherical micelle surfactant solution and polymer solution) in flows through micro-apertures (micro-orifices, circular pores, and hexagonal pores). For water, agreement between the resultant pressure drops and the predictions of the Navier-Stokes equation was obtained. For microbubble/water mixtures, drag reduction effect was suggested over a Reynolds number of about 1.0 x 10(1) in micro-orifice flows. Surfactant solutions exhibited the same results as microbubble/water mixtures. For polymer solutions, significant drag reduction was shown. Moreover, a drag reduction effect, which was independent of the used test fluids, was observed for Reynolds numbers over 1.0 x 10(1) in the flow through circular pores and hexagonal pores. To explain this phenomenon, the size effect, visco-elastic property, electric interaction, and interfacial tension are considered. The results suggest that electric interaction at the wall (interfacial tension) is a contributing factor. In addition, drag reduction rates were estimated.

    DOI: 10.1678/rheology.44.119

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  • Roles and Effects of Human Network of Supporting Experts out of Niigata University to Practical Engineering Education. 査読

    Tetsuo Oka, Kazuhisa Abe, Takeshi Yamauchi, Takatsune Narumi, Nozomu Ishii, Shin-ya Nishimura, Takashi Sato, Yuji Tanabe, Masakazu Sengoku

    iJEP6 ( 1 ) 44 - 49   2016年

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    掲載種別:研究論文(学術雑誌)  

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  • Roles and Effects of Human Network of Supporting Experts out of Niigata University to Practical Engineering Education. 査読

    Tetsuo Oka, Kazuhisa Abe, Takeshi Yamauchi, Takatsune Narumi, Nozomu Ishii, Shin-ya Nishimura, Takashi Sato, Yuji Tanabe, Masakazu Sengoku

    iJEP6 ( 1 ) 44 - 49   2016年

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    掲載種別:研究論文(学術雑誌)  

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  • A simple expression for pressure drops of water and other low molecular liquids in the flow through micro-orifices 査読

    Tomiichi Hasegawa, Akiomi Ushida, Takatsune Narumi

    PHYSICS OF FLUIDS27 ( 12 )   2015年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER INST PHYSICS  

    Flows are generally divided into two types: shear flows and shear-free elongational (extensional) flows. Both are necessary for a thorough understanding of the flow properties of a fluid. Shear flows are easy to achieve in practice, for example, through Poiseuille or Couette flows. Shear-free elongational flows are experimentally hard to achieve, resulting in an incomplete understanding of the flow properties of fluids in micro-devices. Nevertheless, flows through micro-orifices are useful for probing the properties of elongational flows at high elongational rates; although these flows exhibit shear and elongation, the elongation is dominant and the shear is negligible in the central region of the flows. We previously reported an anomalous reduction in pressure drops in the flows of water, a 50/50 mixture of glycerol and water, and silicone oils through micro-orifices. In the present paper, we rearrange the data presented in the previous paper and reveal a simple relationship where the pressure drop is proportional to the velocity through the micro-orifices, independent of the orifice diameter and the viscosity of the liquids tested. We explain our observations by introducing a "fluid element" model, in which fluid elements are formed on entering the orifice. The model is based on the idea that low molecular liquids, including water, generate strong elongational stress, similar to a polymer solution, in the flow through micro-orifices. (C) 2015 AIP Publishing LLC.

    DOI: 10.1063/1.4936943

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  • A simple expression for pressure drops of water and other low molecular liquids in the flow through micro-orifices 査読

    Tomiichi Hasegawa, Akiomi Ushida, Takatsune Narumi

    PHYSICS OF FLUIDS27 ( 12 )   2015年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER INST PHYSICS  

    Flows are generally divided into two types: shear flows and shear-free elongational (extensional) flows. Both are necessary for a thorough understanding of the flow properties of a fluid. Shear flows are easy to achieve in practice, for example, through Poiseuille or Couette flows. Shear-free elongational flows are experimentally hard to achieve, resulting in an incomplete understanding of the flow properties of fluids in micro-devices. Nevertheless, flows through micro-orifices are useful for probing the properties of elongational flows at high elongational rates; although these flows exhibit shear and elongation, the elongation is dominant and the shear is negligible in the central region of the flows. We previously reported an anomalous reduction in pressure drops in the flows of water, a 50/50 mixture of glycerol and water, and silicone oils through micro-orifices. In the present paper, we rearrange the data presented in the previous paper and reveal a simple relationship where the pressure drop is proportional to the velocity through the micro-orifices, independent of the orifice diameter and the viscosity of the liquids tested. We explain our observations by introducing a "fluid element" model, in which fluid elements are formed on entering the orifice. The model is based on the idea that low molecular liquids, including water, generate strong elongational stress, similar to a polymer solution, in the flow through micro-orifices. (C) 2015 AIP Publishing LLC.

    DOI: 10.1063/1.4936943

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  • Sound Attenuation for Dogs Barking Using of Transfer Function Method 査読

    Shuichi Sakamoto, Takatsune Narumi, Yuichi Toyoshima, Nobuaki Murayama, Toru Miyairi, Akira Hoshino

    ADVANCEMENT OF OPTICAL METHODS IN EXPERIMENTAL MECHANICS, VOL 3   153 - 160   2015年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:SPRINGER-VERLAG BERLIN  

    This paper reports a natural ventilation silencer for an animal cage having considerable sound insertion loss. Many veterinary hospitals face a serious problem that hospitalized animals are stressed from the barks of other dogs in the hospital. To address this problem, a solution that barely affects caged dogs' health is required. We attempted to use a silencer with sound insertion loss by attaching it to an opening side of the cage. We constructed the tested prototype silencers by using the resonance of a rectangular room and a nonwoven fabric. We measured the acoustic characteristics of the silencers that were attached to the real scale model of the animal cage. We also measured their insertion loss by considering the estimated frequency characteristics of the dogs' barking sound. The result shows that proposed silencers have more than 10 dB insertion loss; therefore, they can maintain respiratory environment of a caged dogs along with good visibility.

    DOI: 10.1007/978-3-319-06986-9_16

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  • Sound Attenuation for Dogs Barking Using of Transfer Function Method 査読

    Shuichi Sakamoto, Takatsune Narumi, Yuichi Toyoshima, Nobuaki Murayama, Toru Miyairi, Akira Hoshino

    ADVANCEMENT OF OPTICAL METHODS IN EXPERIMENTAL MECHANICS, VOL 3   153 - 160   2015年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:SPRINGER-VERLAG BERLIN  

    This paper reports a natural ventilation silencer for an animal cage having considerable sound insertion loss. Many veterinary hospitals face a serious problem that hospitalized animals are stressed from the barks of other dogs in the hospital. To address this problem, a solution that barely affects caged dogs' health is required. We attempted to use a silencer with sound insertion loss by attaching it to an opening side of the cage. We constructed the tested prototype silencers by using the resonance of a rectangular room and a nonwoven fabric. We measured the acoustic characteristics of the silencers that were attached to the real scale model of the animal cage. We also measured their insertion loss by considering the estimated frequency characteristics of the dogs' barking sound. The result shows that proposed silencers have more than 10 dB insertion loss; therefore, they can maintain respiratory environment of a caged dogs along with good visibility.

    DOI: 10.1007/978-3-319-06986-9_16

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  • Anomalous phenomena in pressure drops of water flows through micro-orifices 査読

    Akiomi Ushida, Tomiichi Hasegawa, Takatsune Narumi

    MICROFLUIDICS AND NANOFLUIDICS17 ( 5 ) 863 - 870   2014年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER HEIDELBERG  

    Pressure drops were measured for high-velocity water flows through micro-orifices of various diameters. The observed pressure drop values agreed well with the values predicted by the Navier-Stokes equation for 400 and 100 mu m diameter orifices, but were lower than the predicted values for orifices less than 50 mu m in diameter. In particular, the measured pressure drop value was almost two orders of magnitude lower than the predicted value for the 10 and 5 mu m diameter orifices. Several factors that may cause a reduction in pressure drop were considered, including orifice shape and deformation of the orifice foil, but none proved to be significant enough to cause such a large reduction. Elastic stress in orifice flow appeared to be the most plausible cause of the pressure drop reduction. The elastic stress, which was estimated by the jet thrust method, was found to be dependent on the mean velocity passing through the micro-orifices, which strongly supported the elasticity of water flows.

    DOI: 10.1007/s10404-014-1362-6

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  • Anomalous phenomena in pressure drops of water flows through micro-orifices 査読

    Akiomi Ushida, Tomiichi Hasegawa, Takatsune Narumi

    MICROFLUIDICS AND NANOFLUIDICS17 ( 5 ) 863 - 870   2014年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER HEIDELBERG  

    Pressure drops were measured for high-velocity water flows through micro-orifices of various diameters. The observed pressure drop values agreed well with the values predicted by the Navier-Stokes equation for 400 and 100 mu m diameter orifices, but were lower than the predicted values for orifices less than 50 mu m in diameter. In particular, the measured pressure drop value was almost two orders of magnitude lower than the predicted value for the 10 and 5 mu m diameter orifices. Several factors that may cause a reduction in pressure drop were considered, including orifice shape and deformation of the orifice foil, but none proved to be significant enough to cause such a large reduction. Elastic stress in orifice flow appeared to be the most plausible cause of the pressure drop reduction. The elastic stress, which was estimated by the jet thrust method, was found to be dependent on the mean velocity passing through the micro-orifices, which strongly supported the elasticity of water flows.

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  • Anomalous phenomena in several types of liquid flows through small orifices in a range of low Reynolds numbers 査読

    Akiomi Ushida, Tomiichi Hasegawa, Takatsune Narumi

    EXPERIMENTAL THERMAL AND FLUID SCIENCE52   191 - 196   2014年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE INC  

    Micro- and nano-scale fluid mechanics is one of the most intriguing and attractive fields in modern fluid mechanics and engineering because it can be applied in various physicochemical, industrial, and biological fields. In the present study, pressure drops were observed in a number of applications for several types of liquid flows through orifices of various sizes at low Reynolds numbers. In the case of water and an aqueous solution of glycerol, although the resultant pressure drops and Euler numbers agreed almost exactly with the values calculated by using the Navier-Stokes equations for an orifice with a diameter of 50 mu m, the values increased as compared with the calculated values for orifices with a diameter of 100 mu m and 200 mu m. The values for the pressure drops of surfactant solutions were similar to those for water. The measured values for some dilute surfactant and polymer solutions appeared to be uncorrelated with the Reynolds number. Several contributing factors are discussed, such as elasticity, cavitation, electric effect, and micro-aperture effect. The formation of a solid-like layer at the solid-liquid interface around the orifice wall is inferred at slow flows and flows with low Reynolds numbers, in agreement with previous studies. (C) 2013 Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.expthermflusci.2013.09.010

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  • Anomalous phenomena in several types of liquid flows through small orifices in a range of low Reynolds numbers 査読

    Akiomi Ushida, Tomiichi Hasegawa, Takatsune Narumi

    EXPERIMENTAL THERMAL AND FLUID SCIENCE52   191 - 196   2014年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE INC  

    Micro- and nano-scale fluid mechanics is one of the most intriguing and attractive fields in modern fluid mechanics and engineering because it can be applied in various physicochemical, industrial, and biological fields. In the present study, pressure drops were observed in a number of applications for several types of liquid flows through orifices of various sizes at low Reynolds numbers. In the case of water and an aqueous solution of glycerol, although the resultant pressure drops and Euler numbers agreed almost exactly with the values calculated by using the Navier-Stokes equations for an orifice with a diameter of 50 mu m, the values increased as compared with the calculated values for orifices with a diameter of 100 mu m and 200 mu m. The values for the pressure drops of surfactant solutions were similar to those for water. The measured values for some dilute surfactant and polymer solutions appeared to be uncorrelated with the Reynolds number. Several contributing factors are discussed, such as elasticity, cavitation, electric effect, and micro-aperture effect. The formation of a solid-like layer at the solid-liquid interface around the orifice wall is inferred at slow flows and flows with low Reynolds numbers, in agreement with previous studies. (C) 2013 Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.expthermflusci.2013.09.010

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  • Effect of Microbubble Mixtures on the Washing Rate of Surfactant Solutions in a Swirling Flow and an Alternating Flow 査読

    Akiomi Ushida, Tomiichi Hasegawa, Keiko Amaki, Takatsune Narumi

    TENSIDE SURFACTANTS DETERGENTS50 ( 5 ) 332 - 338   2013年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:CARL HANSER VERLAG  

    Wastewater from laundry cleaning contributes to water pollution, and the amount of detergent used needs to be reduced. In the present study, water, four types of surfactants, and their microbubble mixtures were used, and washing rates were measured in swirling flows and alternating flows. The microbubble/water mixtures (average particle diameter: 25 gm; mixed with air at 1.5 vol % in water) achieved washing rates higher than those of water alone. Furthermore, microbubbles mixed with an aqueous surfactant solution had a washing rate that depended on the ionization of the surfactant: the mixtures with microbubbles and non-ionic and anionic surfactants had a washing rate that was higher than that of aqueous non-ionic and anionic surfactant solutions without microbubbles. The surface tensions of microbubble/water mixtures and mixtures of microbubbles with non-ionic and anionic surfactants were lower than those without nnicrobubbles. These results provide evidence of an enhanced washing effect for microbubble mixtures in laundry cleaning.

    DOI: 10.3139/113.110265

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  • Effect of Microbubble Mixtures on the Washing Rate of Surfactant Solutions in a Swirling Flow and an Alternating Flow 査読

    Akiomi Ushida, Tomiichi Hasegawa, Keiko Amaki, Takatsune Narumi

    TENSIDE SURFACTANTS DETERGENTS50 ( 5 ) 332 - 338   2013年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:CARL HANSER VERLAG  

    Wastewater from laundry cleaning contributes to water pollution, and the amount of detergent used needs to be reduced. In the present study, water, four types of surfactants, and their microbubble mixtures were used, and washing rates were measured in swirling flows and alternating flows. The microbubble/water mixtures (average particle diameter: 25 gm; mixed with air at 1.5 vol % in water) achieved washing rates higher than those of water alone. Furthermore, microbubbles mixed with an aqueous surfactant solution had a washing rate that depended on the ionization of the surfactant: the mixtures with microbubbles and non-ionic and anionic surfactants had a washing rate that was higher than that of aqueous non-ionic and anionic surfactant solutions without microbubbles. The surface tensions of microbubble/water mixtures and mixtures of microbubbles with non-ionic and anionic surfactants were lower than those without nnicrobubbles. These results provide evidence of an enhanced washing effect for microbubble mixtures in laundry cleaning.

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  • Flow properties of nanobubble mixtures passing through micro-orifices 査読

    Akiomi Ushida, Tomiichi Hasegawa, Takatsune Narumi, Toshiyuki Nakajima

    International Journal of Heat and Fluid Flow40   106 - 115   2013年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Mixtures containing microbubbles or nanobubbles (NBs), as well as their applications, are one of the most interesting research areas in fluid mechanics. In the present study, pressure drops were observed for several types of NB mixtures-NB/water, NB/surfactant, and NB/polymer-when passing through capillary tubes and micro-orifices. Pressure drops of a NB/water mixture agreed with those of water and numerical predictions for a 100-μm orifice, but were lower than both of these results for orifices of 50-μm diameter or less. Agreement was not found between the pressure drops of three NB/surfactant (anionic, nonionic, and cationic) mixtures and those of water or the respective surfactant only in all experimental cases. Moreover, the experimental pressure drops of an NB/polymer (polyethylene glycol) mixture were higher than those of the polymer only. Factors including slip wall, interfacial tension effect, an electric interface phenomenon, and elasticity were examined in experiments and are discussed in this paper. © 2013 Elsevier Inc.

    DOI: 10.1016/j.ijheatfluidflow.2013.01.013

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  • Flow properties of nanobubble mixtures passing through micro-orifices 査読

    Akiomi Ushida, Tomiichi Hasegawa, Takatsune Narumi, Toshiyuki Nakajima

    International Journal of Heat and Fluid Flow40   106 - 115   2013年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Mixtures containing microbubbles or nanobubbles (NBs), as well as their applications, are one of the most interesting research areas in fluid mechanics. In the present study, pressure drops were observed for several types of NB mixtures-NB/water, NB/surfactant, and NB/polymer-when passing through capillary tubes and micro-orifices. Pressure drops of a NB/water mixture agreed with those of water and numerical predictions for a 100-μm orifice, but were lower than both of these results for orifices of 50-μm diameter or less. Agreement was not found between the pressure drops of three NB/surfactant (anionic, nonionic, and cationic) mixtures and those of water or the respective surfactant only in all experimental cases. Moreover, the experimental pressure drops of an NB/polymer (polyethylene glycol) mixture were higher than those of the polymer only. Factors including slip wall, interfacial tension effect, an electric interface phenomenon, and elasticity were examined in experiments and are discussed in this paper. © 2013 Elsevier Inc.

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  • DRAG REDUCTION FOR NANOBUBBLE MIXTURE FLOWS THROUGH MICRO-APERTURES 査読

    Akiomi Ushida, Tomiichi Hasegawa, Takatsune Narumi, Toshiyuki Nakajima

    PROCEEDINGS OF THE 11TH INTERNATIONAL CONFERENCE ON NANOCHANNELS, MICROCHANNELS, AND MINICHANNELS, 2013   2013年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER SOC MECHANICAL ENGINEERS  

    Drag reduction effect for microbubble mixtures flows has been investigated and reported. However, few studies have focused on nanobubble mixtures, which have sub-micron meter size fine bubbles. In the present study, nanobubble mixtures for water and glycerol solution were passed through several sizes of microapertures, and the resultant pressure drops, as compared with water and glycerol solution alone, were evaluated. For small apertures, the experimentally measured pressure drop was less than that for water and glycerol alone. This phenomenon is considered in terms of interface behavior and attributed to the electric interaction between an electric double layer and fine bubbles. The results of the present study suggest that the addition of nanobubbles to a liquid results in excellent drag reduction.

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  • DRAG REDUCTION FOR NANOBUBBLE MIXTURE FLOWS THROUGH MICRO-APERTURES 査読

    Akiomi Ushida, Tomiichi Hasegawa, Takatsune Narumi, Toshiyuki Nakajima

    PROCEEDINGS OF THE 11TH INTERNATIONAL CONFERENCE ON NANOCHANNELS, MICROCHANNELS, AND MINICHANNELS, 2013   2013年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER SOC MECHANICAL ENGINEERS  

    Drag reduction effect for microbubble mixtures flows has been investigated and reported. However, few studies have focused on nanobubble mixtures, which have sub-micron meter size fine bubbles. In the present study, nanobubble mixtures for water and glycerol solution were passed through several sizes of microapertures, and the resultant pressure drops, as compared with water and glycerol solution alone, were evaluated. For small apertures, the experimentally measured pressure drop was less than that for water and glycerol alone. This phenomenon is considered in terms of interface behavior and attributed to the electric interaction between an electric double layer and fine bubbles. The results of the present study suggest that the addition of nanobubbles to a liquid results in excellent drag reduction.

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  • Effect of Mixed Nanobubble and Microbubble Liquids on the Washing Rate of Cloth in an Alternating Flow 査読

    Akiomi Ushida, Tomiichi Hasegawa, Naoyuki Takahashi, Toshiyuki Nakajima, Shotaro Murao, Takatsune Narumi, Hiroshige Uchiyama

    JOURNAL OF SURFACTANTS AND DETERGENTS15 ( 6 ) 695 - 702   2012年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER HEIDELBERG  

    It is well-known that laundry waste water contributes to water pollution, and the need to reduce the amount of detergent used is widely recognized. Predominantly, research has focused on the washing effects of microbubbles and nanobubbles, and mechanical work was found to account for about 50 % of the washing effect on the cloth. In the present research, mixed nanobubble and microbubble water and four types of surfactants (including a commercial cleaning liquid) were investigated in an alternating flow system. The nanobubble water achieved a washing rate greater than that of ion-exchanged water. However, the microbubble water had the same washing rate as ion-exchanged water. Moreover, nanobubbles mixed with an aqueous solution of surfactant exhibited a washing rate that depended on the ionization of the surfactant: the mixture with nanobubbles and anionic surfactant exhibited a washing rate that was higher than that of aqueous anionic surfactant solution without nanobubbles. The surface tensions of nanobubble water and mixed nanobubble anionic surfactant were lower than those without nanobubble, respectively. Also, there was no advantage in mixed microbubble liquids. These results provide evidence of an enhanced washing effect by nanobubble mixtures in liquids.

    DOI: 10.1007/s11743-012-1348-x

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  • Effect of Mixed Nanobubble and Microbubble Liquids on the Washing Rate of Cloth in an Alternating Flow 査読

    Akiomi Ushida, Tomiichi Hasegawa, Naoyuki Takahashi, Toshiyuki Nakajima, Shotaro Murao, Takatsune Narumi, Hiroshige Uchiyama

    JOURNAL OF SURFACTANTS AND DETERGENTS15 ( 6 ) 695 - 702   2012年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER HEIDELBERG  

    It is well-known that laundry waste water contributes to water pollution, and the need to reduce the amount of detergent used is widely recognized. Predominantly, research has focused on the washing effects of microbubbles and nanobubbles, and mechanical work was found to account for about 50 % of the washing effect on the cloth. In the present research, mixed nanobubble and microbubble water and four types of surfactants (including a commercial cleaning liquid) were investigated in an alternating flow system. The nanobubble water achieved a washing rate greater than that of ion-exchanged water. However, the microbubble water had the same washing rate as ion-exchanged water. Moreover, nanobubbles mixed with an aqueous solution of surfactant exhibited a washing rate that depended on the ionization of the surfactant: the mixture with nanobubbles and anionic surfactant exhibited a washing rate that was higher than that of aqueous anionic surfactant solution without nanobubbles. The surface tensions of nanobubble water and mixed nanobubble anionic surfactant were lower than those without nanobubble, respectively. Also, there was no advantage in mixed microbubble liquids. These results provide evidence of an enhanced washing effect by nanobubble mixtures in liquids.

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  • Measurement and Observation of Jet Thrust for Water Flow Through Micro-Orifice 査読

    Akiomi Ushida, Tomiichi Hasegawa, Takehiro Hoshina, Shouta Kudou, Hiroshige Uchiyama, Takatsune Narumi

    JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME134 ( 8 )   2012年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ASME  

    Owing to the many potential industrial and biological applications of microfluid mechanics, it has recently become an attractive research topic. However, researchers have mainly concentrated on microchannel flows and studies investigating micro-orifice flows are rare cases. In the present study, the results from experiments conducted on flows through micro-orifices with diameters of 100 mu m, 50 mu m, and 25 mu m are presented. In these experiments, the thrust and diameter of observed outflow jets are measured. The resultant thrust and diameter of the jets for the 100 mu m orifice flow agree with the numerical predictions obtained via the Navier-Stokes equations. Conversely, for an orifice with a diameter of 50 mu m or less, it is found that the thrust is lower than that predicted and the existence of jet swell becomes apparent. With the estimated elastic stress proportional to squared mean velocity, a change in the elasticity of the water as it flows through a micro-orifice is strongly suggested. [DOI: 10.1115/1.4007014]

    DOI: 10.1115/1.4007014

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  • Measurement and Observation of Jet Thrust for Water Flow Through Micro-Orifice 査読

    Akiomi Ushida, Tomiichi Hasegawa, Takehiro Hoshina, Shouta Kudou, Hiroshige Uchiyama, Takatsune Narumi

    JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME134 ( 8 )   2012年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ASME  

    Owing to the many potential industrial and biological applications of microfluid mechanics, it has recently become an attractive research topic. However, researchers have mainly concentrated on microchannel flows and studies investigating micro-orifice flows are rare cases. In the present study, the results from experiments conducted on flows through micro-orifices with diameters of 100 mu m, 50 mu m, and 25 mu m are presented. In these experiments, the thrust and diameter of observed outflow jets are measured. The resultant thrust and diameter of the jets for the 100 mu m orifice flow agree with the numerical predictions obtained via the Navier-Stokes equations. Conversely, for an orifice with a diameter of 50 mu m or less, it is found that the thrust is lower than that predicted and the existence of jet swell becomes apparent. With the estimated elastic stress proportional to squared mean velocity, a change in the elasticity of the water as it flows through a micro-orifice is strongly suggested. [DOI: 10.1115/1.4007014]

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  • Drag reduction effect of nanobubble mixture flows through micro-orifices and capillaries 査読

    Akiomi Ushida, Tomiichi Hasegawa, Toshiyuki Nakajima, Hiroshige Uchiyama, Takatsune Narumi

    EXPERIMENTAL THERMAL AND FLUID SCIENCE39   54 - 59   2012年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE INC  

    Much research on microbubbles and their drag reduction effect has been reported. However, few studies have focused on nanobubbles, which have sub-micrometer size. Mixtures of surfactants and polymers are known to reduce drag, but their use is limited because of environmental concerns. In this research, nanobubble mixtures for water and glycerol were passed through several sizes of micro-orifices and capillaries, and the resultant pressure drops, as compared with water and glycerol, were evaluated. For a small orifice (<= 50 mu m) and capillary (<= 70 mu m), the experimentally observed pressure drop was less than that for water. This phenomenon is considered in terms of interface behavior and attributed to the electrical interaction between an electric double layer and nanobubbles. The results of the present research suggest that the addition of nanobubbles to a liquid results in excellent drag reduction. (C) 2012 Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.expthermflusci.2012.01.008

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  • Drag reduction effect of nanobubble mixture flows through micro-orifices and capillaries 査読

    Akiomi Ushida, Tomiichi Hasegawa, Toshiyuki Nakajima, Hiroshige Uchiyama, Takatsune Narumi

    EXPERIMENTAL THERMAL AND FLUID SCIENCE39   54 - 59   2012年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE INC  

    Much research on microbubbles and their drag reduction effect has been reported. However, few studies have focused on nanobubbles, which have sub-micrometer size. Mixtures of surfactants and polymers are known to reduce drag, but their use is limited because of environmental concerns. In this research, nanobubble mixtures for water and glycerol were passed through several sizes of micro-orifices and capillaries, and the resultant pressure drops, as compared with water and glycerol, were evaluated. For a small orifice (<= 50 mu m) and capillary (<= 70 mu m), the experimentally observed pressure drop was less than that for water. This phenomenon is considered in terms of interface behavior and attributed to the electrical interaction between an electric double layer and nanobubbles. The results of the present research suggest that the addition of nanobubbles to a liquid results in excellent drag reduction. (C) 2012 Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.expthermflusci.2012.01.008

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  • Drag Reduction Effect of Microbubble/Water Mixtures and Complex Fluids into Capillary Flows 査読

    Akiomi Ushida, Tomiichi Hasegawa, Takatsune Narumi, Keiko Amaki, Ryuichi Kayaba

    NIHON REOROJI GAKKAISHI40 ( 4 ) 179 - 184   2012年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    The pressure drops and frictional coefficients were measured and estimated for water, microbubble/water mixtures (MB water), and complex fluids (surfactant solutions and polymer solutions) in capillary flows. Good agreement for water was obtained between the experimental results and theoretical value for Hagen-Poiseuille flows. For MB water, the laminarization was suggested until 4000 of the Reynolds number. Both surfactant solutions and polymer solutions exhibited the same results as MB water. In the explaining this behavior, elasticity, electrical interaction, and size effect are considered. Consequently, it is strongly suggested that electrical interaction on capillary wall is a contributing factor. In addition, surface tension was investigated and supported the discussion.

    DOI: 10.1678/rheology.40.179

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  • Drag Reduction Effect of Microbubble/Water Mixtures and Complex Fluids into Capillary Flows 査読

    Akiomi Ushida, Tomiichi Hasegawa, Takatsune Narumi, Keiko Amaki, Ryuichi Kayaba

    NIHON REOROJI GAKKAISHI40 ( 4 ) 179 - 184   2012年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    The pressure drops and frictional coefficients were measured and estimated for water, microbubble/water mixtures (MB water), and complex fluids (surfactant solutions and polymer solutions) in capillary flows. Good agreement for water was obtained between the experimental results and theoretical value for Hagen-Poiseuille flows. For MB water, the laminarization was suggested until 4000 of the Reynolds number. Both surfactant solutions and polymer solutions exhibited the same results as MB water. In the explaining this behavior, elasticity, electrical interaction, and size effect are considered. Consequently, it is strongly suggested that electrical interaction on capillary wall is a contributing factor. In addition, surface tension was investigated and supported the discussion.

    DOI: 10.1678/rheology.40.179

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  • Pressure Drop in Entrance Flows from Cavity to Slot of Viscoelastic Fluids inside Slot Die 査読

    Tomohiko Anazawa, Takeaki Tsuda, Hiroshi Yoshiba, Takatsune Narumi, Nobuyuki Fujisawa, Takayuki Yamagata, Tomiichi Hasegawa

    NIHON REOROJI GAKKAISHI40 ( 2 ) 91 - 99   2012年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    In this work, entrance flows of viscoelastic fluids from a cavity to a slot in a slot die coating were investigated experimentally and numerically. Aqueous solutions of polyethylene glycol (PEG) and polyethylene oxide (PEO) mixtures, having viscoelasticity and Newtonian viscosity, were tested in order to clarify the effects of viscoelastic characteristics to the excess pressure drops at the entrance. The measured excess pressure drop changes corresponded to the flow pattern changes from a Newtonian-like flow pattern to vortex generation and growth patterns in an asymmetric entrance flow with a submillimeter slot. Numerical predictions of the transitions in the flow patterns and the pressure drops were also made utilizing exponential Phan-Thien-Tanner (EPTT) model with a finite element method. The predictions qualitatively indicated the increase in excess pressure drop and the vortex generation and growth.

    DOI: 10.1678/rheology.40.91

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  • Flow Properties of Microbubble/Polyethylene Glycol Mixtures Passing through Orifices and Slits 査読

    Akiomi Ushida, Tomiichi Hasegawa, Masato Kawami, Hiroshige Uchiyama, Takatsune Narumi, Ryuichi Kayaba

    NIHON REOROJI GAKKAISHI40 ( 2 ) 61 - 68   2012年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Flows of microbubble/liquid mixtures have been extensively studied in both theoretical and applied research, and important results, such as drag reduction effects, have been reported. However, the majority of researchers have focused on only mixtures of microbubbles and water. Studies on microbubble mixtures in complex liquids, for example, for surfactant solutions and polymer solutions, are limited. The present study considers the flow of microbubble mixtures in a dilute polymer solution. In the present research, microbubbles (particle size: 20 mu m) are suspended in either water or a dilute solution of polyethylene glycol. The liquids and suspensions were passed through various sizes of orifices (200 mu m to 1.0 mm) and slits (397 mu m and 596 mu m), pressure drops were measured, and elongational stresses were estimated. Pressure drops of the polyethylene glycol solution were less than those of water, and the measured pressure drops of both microbubble mixtures were greater than those of the polyethylene glycol solution. As a result, polymer chains in the polyethylene glycol solution are considered to be laden with microbubbles, and this effect is seen in the corresponding elongational stress estimates.

    DOI: 10.1678/rheology.40.61

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  • Pressure Drop in Entrance Flows from Cavity to Slot of Viscoelastic Fluids inside Slot Die 査読

    Tomohiko Anazawa, Takeaki Tsuda, Hiroshi Yoshiba, Takatsune Narumi, Nobuyuki Fujisawa, Takayuki Yamagata, Tomiichi Hasegawa

    NIHON REOROJI GAKKAISHI40 ( 2 ) 91 - 99   2012年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    In this work, entrance flows of viscoelastic fluids from a cavity to a slot in a slot die coating were investigated experimentally and numerically. Aqueous solutions of polyethylene glycol (PEG) and polyethylene oxide (PEO) mixtures, having viscoelasticity and Newtonian viscosity, were tested in order to clarify the effects of viscoelastic characteristics to the excess pressure drops at the entrance. The measured excess pressure drop changes corresponded to the flow pattern changes from a Newtonian-like flow pattern to vortex generation and growth patterns in an asymmetric entrance flow with a submillimeter slot. Numerical predictions of the transitions in the flow patterns and the pressure drops were also made utilizing exponential Phan-Thien-Tanner (EPTT) model with a finite element method. The predictions qualitatively indicated the increase in excess pressure drop and the vortex generation and growth.

    DOI: 10.1678/rheology.40.91

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  • Forward to Special Issue for Flow Phenomena of Complex Fluids 査読

    Takatsune Narumi, Tsutomu Takahashi

    NIHON REOROJI GAKKAISHI40 ( 2 ) 53 - 53   2012年

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    記述言語:日本語   出版者・発行元:SOC RHEOLOGY, JAPAN  

    DOI: 10.1678/rheology.40.53

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  • Flow Properties of Microbubble/Polyethylene Glycol Mixtures Passing through Orifices and Slits 査読

    Akiomi Ushida, Tomiichi Hasegawa, Masato Kawami, Hiroshige Uchiyama, Takatsune Narumi, Ryuichi Kayaba

    NIHON REOROJI GAKKAISHI40 ( 2 ) 61 - 68   2012年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Flows of microbubble/liquid mixtures have been extensively studied in both theoretical and applied research, and important results, such as drag reduction effects, have been reported. However, the majority of researchers have focused on only mixtures of microbubbles and water. Studies on microbubble mixtures in complex liquids, for example, for surfactant solutions and polymer solutions, are limited. The present study considers the flow of microbubble mixtures in a dilute polymer solution. In the present research, microbubbles (particle size: 20 mu m) are suspended in either water or a dilute solution of polyethylene glycol. The liquids and suspensions were passed through various sizes of orifices (200 mu m to 1.0 mm) and slits (397 mu m and 596 mu m), pressure drops were measured, and elongational stresses were estimated. Pressure drops of the polyethylene glycol solution were less than those of water, and the measured pressure drops of both microbubble mixtures were greater than those of the polyethylene glycol solution. As a result, polymer chains in the polyethylene glycol solution are considered to be laden with microbubbles, and this effect is seen in the corresponding elongational stress estimates.

    DOI: 10.1678/rheology.40.61

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  • Forward to Special Issue for Flow Phenomena of Complex Fluids 査読

    Takatsune Narumi, Tsutomu Takahashi

    NIHON REOROJI GAKKAISHI40 ( 2 ) 53 - 53   2012年

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    記述言語:日本語   出版者・発行元:SOC RHEOLOGY, JAPAN  

    DOI: 10.1678/rheology.40.53

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  • FLOW PROPERTIES FOR SEVERAL KINDS OF LIQUID FLOWS THROUGH MICRO-ORIFICES 査読

    Akiomi Ushida, Tomiichi Hasegawa, Hiroshige Uchiyama, Takatsune Narumi

    PROCEEDINGS OF THE ASME/JSME/KSME JOINT FLUIDS ENGINEERING CONFERENCE 2011, VOL 1, PTS A-D   3279 - 3285   2012年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER SOC MECHANICAL ENGINEERS  

    In this paper, the flow properties of several types of liquid passing through various sizes of micro-orifices were investigated. The jet thrust and pressure drops were measured for two polyethylene glycol solutions and four surfactant solutions. Different flow properties were found for the various surfactant solutions depending on the charge of the solute. For an anionic surfactant, the results were similar to those for water, whereas in the case of a cationic surfactant, both the jet thrust and pressure decreased greatly in comparison with the other test liquids. Finally, a nonionic surfactant exhibited a steep rise in the pressure drop at a particular value of the Reynolds number. In explaining this behavior, the liquid-solid interface and alignment of the surfactant molecules are considered, and consequently, it is strongly suggested that the elastic stress on elongational flows is a contributing factor. In addition, the decreases in pressure and thrust for polyethylene glycols are attributed to viscoelastic properties, regardless of the molecular weight of PEG.

    DOI: 10.1115/AJK2011-14003

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  • Rheological Properties for Microbubble/Dilute Polymer Mixtures Passing through Small Orifices 査読

    Akiomi Ushida, Tomiichi Hasegawa, Masato Kawami, Hiroshige Uchiyama, Takatsune Narumi

    KAGAKU KOGAKU RONBUNSHU38 ( 1 ) 32 - 38   2012年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC CHEMICAL ENG JAPAN  

    Mixtures of microbubbles (particle size, 20 mu m) with water or dilute polymer solutions were passed through micro-orifices of 100-400 mu m. Pressure drops were measured, and elastic stresses were estimated. The pressure drops of Polyethylene Oxide solutions alone were less than those of water, while the pressure drops of microbubble mixtures with Polyethylene Oxide were greater than those of Polyethylene Oxide solutions alone. This phenomenon was thought to arise from hindrance by microbubbles of the association of polymer chains in the solution; and this idea was supported by the estimated elastic stresses.

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  • Rheological Properties for Microbubble/Dilute Polymer Mixtures Passing through Small Orifices 査読

    Akiomi Ushida, Tomiichi Hasegawa, Masato Kawami, Hiroshige Uchiyama, Takatsune Narumi

    KAGAKU KOGAKU RONBUNSHU38 ( 1 ) 32 - 38   2012年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC CHEMICAL ENG JAPAN  

    Mixtures of microbubbles (particle size, 20 mu m) with water or dilute polymer solutions were passed through micro-orifices of 100-400 mu m. Pressure drops were measured, and elastic stresses were estimated. The pressure drops of Polyethylene Oxide solutions alone were less than those of water, while the pressure drops of microbubble mixtures with Polyethylene Oxide were greater than those of Polyethylene Oxide solutions alone. This phenomenon was thought to arise from hindrance by microbubbles of the association of polymer chains in the solution; and this idea was supported by the estimated elastic stresses.

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  • FLOW PROPERTIES FOR SEVERAL KINDS OF LIQUID FLOWS THROUGH MICRO-ORIFICES 査読

    Akiomi Ushida, Tomiichi Hasegawa, Hiroshige Uchiyama, Takatsune Narumi

    PROCEEDINGS OF THE ASME/JSME/KSME JOINT FLUIDS ENGINEERING CONFERENCE 2011, VOL 1, PTS A-D   3279 - 3285   2012年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER SOC MECHANICAL ENGINEERS  

    In this paper, the flow properties of several types of liquid passing through various sizes of micro-orifices were investigated. The jet thrust and pressure drops were measured for two polyethylene glycol solutions and four surfactant solutions. Different flow properties were found for the various surfactant solutions depending on the charge of the solute. For an anionic surfactant, the results were similar to those for water, whereas in the case of a cationic surfactant, both the jet thrust and pressure decreased greatly in comparison with the other test liquids. Finally, a nonionic surfactant exhibited a steep rise in the pressure drop at a particular value of the Reynolds number. In explaining this behavior, the liquid-solid interface and alignment of the surfactant molecules are considered, and consequently, it is strongly suggested that the elastic stress on elongational flows is a contributing factor. In addition, the decreases in pressure and thrust for polyethylene glycols are attributed to viscoelastic properties, regardless of the molecular weight of PEG.

    DOI: 10.1115/AJK2011-14003

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  • Effect of Mixed Nanobubble/Water Liquid Flows through Micro Apertures and Small Capillaries 査読

    Akiomi Ushida, Tomiichi Hasegawa, Shinji Toga, Takatsune Narumi, Toshiyuki Nakajima, Hiroshige Uchiyama

    KAGAKU KOGAKU RONBUNSHU37 ( 5 ) 371 - 376   2011年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC CHEMICAL ENG JAPAN  

    Much research on microbubbles and their drag reduction effect has been reported. However, few studies have focused on nanobubbles, which have sub-micrometer size. Mixtures of surfactants and polymers are known to reduce drag, but their use is limited because of environmental concerns. In this study, nanobubble/water mixtures were passed through several sizes of micro orifices and capillaries, and the resultant pressure drops, as compared with water, were evaluated. For a small orifice (<= 50 mu m) and capillary (<= 70 mu m), the experimentally observed pressure drop was less than that for water. This phenomenon is considered in terms of interface behavior and attributed to the electrical interaction between an electric double layer and nanobubbles. The results of this study suggest that the addition of nanobubbles to a liquid results in superior drag reduction.

    DOI: 10.1252/kakoronbunshu.37.371

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  • Transient Response of Viscoelastic Concentrated Suspensions After Reversal in Large Amplitude Oscillatory Shear Flow 査読

    Ayumi Yoshida, Takatsune Narumi

    NIHON REOROJI GAKKAISHI39 ( 4 ) 173 - 180   2011年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Concentrated suspensions of non-Brownian spheres dispersed in Newtonian / viscoelastic carrier liquids were placed under large amplitude oscillatory shear flows. Transient responses in shear rate and strain after each shear reversal were examined under sinusoidal stresses applied. The viscoelastic suspensions have showed similar transient responses with fluidity increase to those observed with Newtonian carrier liquids. It was considered that these responses were caused with collapse and rearrangement in the particulate microstructure. In order to clarify the influence of the viscoelasticity of carrier liquids on the fluidity increase, deviations in the shear rate from purely viscous predictions and characteristic strains were estimated. The flows of viscoelastic suspensions were reversed before stress reversal applied due to the elastic recoil of the polymers in the carrier liquid. Such kind of historical effects of viscoelasticity increased the fluidity at the first stage in the transient period and finished the whole transient phenomena with smaller strains. But, the viscoelasticity resisted the rearrangement in the latter half stage. Typical gap between the particles was introduced to obtain dependence of the volume fraction on the transient responses. The characteristic strains to the whole transient responses were normalized well with the gap both for Newtonian and viscoelastic cases.

    DOI: 10.1678/rheology.39.173

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  • Transient Response of Viscoelastic Concentrated Suspensions After Reversal in Large Amplitude Oscillatory Shear Flow 査読

    Ayumi Yoshida, Takatsune Narumi

    NIHON REOROJI GAKKAISHI39 ( 4 ) 173 - 180   2011年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Concentrated suspensions of non-Brownian spheres dispersed in Newtonian / viscoelastic carrier liquids were placed under large amplitude oscillatory shear flows. Transient responses in shear rate and strain after each shear reversal were examined under sinusoidal stresses applied. The viscoelastic suspensions have showed similar transient responses with fluidity increase to those observed with Newtonian carrier liquids. It was considered that these responses were caused with collapse and rearrangement in the particulate microstructure. In order to clarify the influence of the viscoelasticity of carrier liquids on the fluidity increase, deviations in the shear rate from purely viscous predictions and characteristic strains were estimated. The flows of viscoelastic suspensions were reversed before stress reversal applied due to the elastic recoil of the polymers in the carrier liquid. Such kind of historical effects of viscoelasticity increased the fluidity at the first stage in the transient period and finished the whole transient phenomena with smaller strains. But, the viscoelasticity resisted the rearrangement in the latter half stage. Typical gap between the particles was introduced to obtain dependence of the volume fraction on the transient responses. The characteristic strains to the whole transient responses were normalized well with the gap both for Newtonian and viscoelastic cases.

    DOI: 10.1678/rheology.39.173

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  • Flow Properties of Several Types of Surfactant/Nanobubble Mixtures Passing Through Micro-Apertures 査読

    Akiomi Ushida, Tomiichi Hasegawa, Hiroshige Uchiyama, Takatsune Narumi, Ryuichi Kayaba

    NIHON REOROJI GAKKAISHI39 ( 4 ) 165 - 172   2011年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Mixtures of surfactants and polymers are known to reduce drag, but their use is limited because of environmental concerns. In this study, surfactant/nanobubble mixtures were passed through several sizes of micro-orifices, and the resultant pressure drops, as compared with water and only surfactant solution, were evaluated. For anionic surfactant/nanobubble mixtures, the experimentally observed pressure drop was less than that for water. However, it was found that the pressure drop was greater than that for only anionic surfactant solution. In the case of non-ionic and cationic surfactants, the experimental results of mixed nanobubble liquids were less than those for water and only surfactant solution. This phenomenon is considered in terms of interface behavior and attributed to the electrical interaction between an electric double layer and nanobubbles.

    DOI: 10.1678/rheology.39.165

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  • Flow Properties of Several Types of Surfactant/Nanobubble Mixtures Passing Through Micro-Apertures 査読

    Akiomi Ushida, Tomiichi Hasegawa, Hiroshige Uchiyama, Takatsune Narumi, Ryuichi Kayaba

    NIHON REOROJI GAKKAISHI39 ( 4 ) 165 - 172   2011年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Mixtures of surfactants and polymers are known to reduce drag, but their use is limited because of environmental concerns. In this study, surfactant/nanobubble mixtures were passed through several sizes of micro-orifices, and the resultant pressure drops, as compared with water and only surfactant solution, were evaluated. For anionic surfactant/nanobubble mixtures, the experimentally observed pressure drop was less than that for water. However, it was found that the pressure drop was greater than that for only anionic surfactant solution. In the case of non-ionic and cationic surfactants, the experimental results of mixed nanobubble liquids were less than those for water and only surfactant solution. This phenomenon is considered in terms of interface behavior and attributed to the electrical interaction between an electric double layer and nanobubbles.

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  • Measurement of Jet Thrusts and Pressure Drops and Estimation of Elongational Stress of Liquids in Slit Flows 査読

    Akiomi Ushida, Tomiichi Hasegawa, Hiroshige Uchiyama, Takatsune Narumi

    KAGAKU KOGAKU RONBUNSHU37 ( 3 ) 203 - 210   2011年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC CHEMICAL ENG JAPAN  

    While many studies have been conducted on the flow properties of visco-elastic and complex fluids, most have conducted shear flows, for example, Poiseuille flow. Among the few studies on elongational flows, so-called Newtonian fluids have been reported to show elasticity in orifice flows. In the present research, slit flows were examined by measuring jet thrusts and pressure drops for water, macromolecular fluids, and aqueous solutions of various surfactants. For water, it was found that the measured values were lower than those predicted the Navier-Stokes equation for slit lengths of less than 68 mm. Elongational stress estimated from jet thrusts and pressure drops was almost equal to the past results and dependent on mean velocity. Also, gradient in elongational stress plotted against mean velocity was about 2.1. For aqueous solutions of surfactants, the results differed according to their polarity. Cationic surfactant caused the biggest decrease from the predicted values, followed by nonionic surfactant. Anionic surfactant gave the same results as water. These effects were attributed to a liquid-solid surface phenomenon. For macromolecular fluids, viscoelastic effects caused marked decreases from predicted values, as has been reported previously.

    DOI: 10.1252/kakoronbunshu.37.203

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  • Measurement of Jet Thrusts and Pressure Drops and Estimation of Elongational Stress of Liquids in Slit Flows 査読

    Akiomi Ushida, Tomiichi Hasegawa, Hiroshige Uchiyama, Takatsune Narumi

    KAGAKU KOGAKU RONBUNSHU37 ( 3 ) 203 - 210   2011年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC CHEMICAL ENG JAPAN  

    While many studies have been conducted on the flow properties of visco-elastic and complex fluids, most have conducted shear flows, for example, Poiseuille flow. Among the few studies on elongational flows, so-called Newtonian fluids have been reported to show elasticity in orifice flows. In the present research, slit flows were examined by measuring jet thrusts and pressure drops for water, macromolecular fluids, and aqueous solutions of various surfactants. For water, it was found that the measured values were lower than those predicted the Navier-Stokes equation for slit lengths of less than 68 mm. Elongational stress estimated from jet thrusts and pressure drops was almost equal to the past results and dependent on mean velocity. Also, gradient in elongational stress plotted against mean velocity was about 2.1. For aqueous solutions of surfactants, the results differed according to their polarity. Cationic surfactant caused the biggest decrease from the predicted values, followed by nonionic surfactant. Anionic surfactant gave the same results as water. These effects were attributed to a liquid-solid surface phenomenon. For macromolecular fluids, viscoelastic effects caused marked decreases from predicted values, as has been reported previously.

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  • Effect of Mixed Nanobubble/Water Liquid Flows through Micro Apertures and Small Capillaries 査読

    Akiomi Ushida, Tomiichi Hasegawa, Shinji Toga, Takatsune Narumi, Toshiyuki Nakajima, Hiroshige Uchiyama

    KAGAKU KOGAKU RONBUNSHU37 ( 5 ) 371 - 376   2011年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC CHEMICAL ENG JAPAN  

    Much research on microbubbles and their drag reduction effect has been reported. However, few studies have focused on nanobubbles, which have sub-micrometer size. Mixtures of surfactants and polymers are known to reduce drag, but their use is limited because of environmental concerns. In this study, nanobubble/water mixtures were passed through several sizes of micro orifices and capillaries, and the resultant pressure drops, as compared with water, were evaluated. For a small orifice (<= 50 mu m) and capillary (<= 70 mu m), the experimentally observed pressure drop was less than that for water. This phenomenon is considered in terms of interface behavior and attributed to the electrical interaction between an electric double layer and nanobubbles. The results of this study suggest that the addition of nanobubbles to a liquid results in superior drag reduction.

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  • Drag reduction for liquid flow through micro-apertures 査読

    Akiomi Ushida, Tomiichi Hasegawa, Takatsune Narumi

    JOURNAL OF NON-NEWTONIAN FLUID MECHANICS165 ( 21-22 ) 1516 - 1524   2010年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Pressure drops in the flow through micro-orifices and capillaries were measured for silicone oils, aqueous solutions of polyethylene glycol (PEG), and surfactant aqueous solutions The diameter of micro-orifices ranged from 5 mu m to 400 mu m The corresponding length/diameter ratio was from 4 to 0.05 and capillary diameters were 105 mu m and 450 mu m The following results were obtained . silicone oils of 10(-6) m(2)/s and 10(-5) m(2)/s in kinematic viscosity generated a reduction of pressure drop (RPD), that is, drag reduction, similar to the RPD of water and a glycerol/water mixture reported in the previous paper by the present authors When RPD occurred, the pressure drop (PD) of silicone oils of 10(-6) m(2)/s and 10(-5) m(2)/s had nearly the same magnitude. Namely, the difference in viscosity did not influence RPD A 10(3) ppm aqueous solution of PEG20000 provided almost the same PD as that of PEG8000 for the 400 mu m to 15 mu m orifices. but a greater PD than that of PEG8000 for the 10 mu m to 5 mu m orifices A non-ionic surfactant and a cationic surfactant were highly effective in RPD compared with anionic surfactants. the non-ionic and cationic surfactant solutions had PD one order of magnitude lower than that of water under some flow conditions in the concentration range from 1 ppm to 10(4) ppm. but the anionic surfactant solutions did not generate RPD except in the case of the smallest orifice of 5 p.m in diameter The PD of the non-ionic surfactant solution showed a steep rise at a Reynolds number (Re(t)) for 400 mu m to 15 mu m orifices The Re(t) provides the relationship Re(t) = K/D. where D is the orifice diameter. and K is a constant of 2 x 10(-2) m for the 100-20 mu m orifices irrespective of liquid concentration. Capillary flow experiment revealed that the PEG, non-ionic and cationic surfactant solutions generated RPD also in a laminar flow through the capillary of 105 mu m in diameter, but not in the flow through the capillary of 450 mu m in diameter In order to clarify the cause of RPD, an additional experiment was carried out by changing the orifice material from metal to acrylic resin The result gave a different appearance of RPD. suggesting that RPD is related to an interfacial phenomenon between the liquid and wall The large RPDs found in the present experiment are very interesting from both academic and practical viewpoints. (c) 2010 Elsevier B V. All rights reserved

    DOI: 10.1016/j.jnnfm.2010.07.015

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  • Drag reduction for liquid flow through micro-apertures 査読

    Akiomi Ushida, Tomiichi Hasegawa, Takatsune Narumi

    JOURNAL OF NON-NEWTONIAN FLUID MECHANICS165 ( 21-22 ) 1516 - 1524   2010年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Pressure drops in the flow through micro-orifices and capillaries were measured for silicone oils, aqueous solutions of polyethylene glycol (PEG), and surfactant aqueous solutions The diameter of micro-orifices ranged from 5 mu m to 400 mu m The corresponding length/diameter ratio was from 4 to 0.05 and capillary diameters were 105 mu m and 450 mu m The following results were obtained . silicone oils of 10(-6) m(2)/s and 10(-5) m(2)/s in kinematic viscosity generated a reduction of pressure drop (RPD), that is, drag reduction, similar to the RPD of water and a glycerol/water mixture reported in the previous paper by the present authors When RPD occurred, the pressure drop (PD) of silicone oils of 10(-6) m(2)/s and 10(-5) m(2)/s had nearly the same magnitude. Namely, the difference in viscosity did not influence RPD A 10(3) ppm aqueous solution of PEG20000 provided almost the same PD as that of PEG8000 for the 400 mu m to 15 mu m orifices. but a greater PD than that of PEG8000 for the 10 mu m to 5 mu m orifices A non-ionic surfactant and a cationic surfactant were highly effective in RPD compared with anionic surfactants. the non-ionic and cationic surfactant solutions had PD one order of magnitude lower than that of water under some flow conditions in the concentration range from 1 ppm to 10(4) ppm. but the anionic surfactant solutions did not generate RPD except in the case of the smallest orifice of 5 p.m in diameter The PD of the non-ionic surfactant solution showed a steep rise at a Reynolds number (Re(t)) for 400 mu m to 15 mu m orifices The Re(t) provides the relationship Re(t) = K/D. where D is the orifice diameter. and K is a constant of 2 x 10(-2) m for the 100-20 mu m orifices irrespective of liquid concentration. Capillary flow experiment revealed that the PEG, non-ionic and cationic surfactant solutions generated RPD also in a laminar flow through the capillary of 105 mu m in diameter, but not in the flow through the capillary of 450 mu m in diameter In order to clarify the cause of RPD, an additional experiment was carried out by changing the orifice material from metal to acrylic resin The result gave a different appearance of RPD. suggesting that RPD is related to an interfacial phenomenon between the liquid and wall The large RPDs found in the present experiment are very interesting from both academic and practical viewpoints. (c) 2010 Elsevier B V. All rights reserved

    DOI: 10.1016/j.jnnfm.2010.07.015

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  • Experimental Study of Pressure Drops in Liquids Passing through Micro-Orifices in a Range of Low Reynolds Numbers 査読

    Akiomi Ushida, Tomiichi Hasegawa, Takatsune Narumi, Shouta Kudou

    NIHON REOROJI GAKKAISHI38 ( 1 ) 1 - 7   2010年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Micro fluid mechanics is one of interesting fields in modern fluid mechanics, because it is applied to physical, industrial, and biological research. In the present study, pressure drops were measured for some kinds of liquids passing through various micro orifices at low Reynolds numbers. It was found that the measured pressure drops almost agree with the prediction by Navier-Stokes equation for orifices smaller than or equal to 50 micron meters in diameter for water and glycerol aqueous solution, but they increase over the prediction for orifices of 100 and 200 micron meters in diameter. Dimensionless pressure drops appear not to be correlated with Reynolds number for some surfactant solutions.

    DOI: 10.1678/rheology.38.1

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  • Measurement of Thrusts and Estimation of Elastic Stresses of Liquids Passing Through Micro-Orifices 査読

    Akiomi Ushida, Tomiichi Hasegawa, Shouta Kudou, Masato Kawami, Hiroshige Uchiyama, Takatsune Narumi

    NIHON REOROJI GAKKAISHI38 ( 4-5 ) 215 - 221   2010年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Jet thrusts of several kinds of liquids issuing through small orifices were measured and compared with the predictions from numerical simulations of the Navier-Stokes equations. Reasonable agreements for so-called Newtonian fluids were obtained between the experimental and predicted thrusts for capillaries and orifices with openings of the order of 100 pm size, but the experimental thrusts were found to be below the predictions for orifices of the order of 10 pm. It was suggested that water and glycerol solutions have an elastic property for elongational flows passing through small orifices. As to surfactant aqueous solutions, cationic surfactant(BC) and non-ionic surfactant(AE(23)) provided thrusts lower than those of water, but anionic surfactant(LAS) showed almost the same thrusts as water. Also, lower thrusts were measured for dilute polymer aqueous solutions of PEO(18). A mean elastic stress for the tested liquids was evaluated by using the measured thrusts, and discussion was made on the idea that flows near the wall are affected by an interaction between anions on the surface of orifice and charged molecules of surfactants.

    DOI: 10.1678/rheology.38.215

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  • Studies on Fluidity and Structure Change of Complex Fluids 査読

    Takatsune Narumi

    NIHON REOROJI GAKKAISHI38 ( 4-5 ) 167 - 173   2010年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Fluidity changes of various complex fluids corresponding to those structure changes have been investigated. Peculiar responses of the fluids were mainly examined in transient flows. Electro-rheological characteristics of liquid crystals were systematically clarified and relatively simple models were developed for both steady and oscillatory flows. Flow induced unstable structure generated with a liquid crystalline polymer were examined in slit flows with a corner. The characteristics of the unstable texture were clarified and the stability of the structure was controlled with the channel design. Typical transient responses of concentrated suspensions due to structure rearrangements of particles have been clarified in re-started flows and LAOS flows. It was found in LAOS experiments that the response waveforms consisted of the transient response after each reversal in the shearing direction, followed by purely viscous behavior. The characteristic strain for the microstructural rearrangement was found to be essentially independent of the oscillation frequency, and showed good agreement with the corresponding characteristic strain obtained from the restarted flows.

    DOI: 10.1678/rheology.38.167

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  • Measurement of Thrusts and Estimation of Elastic Stresses of Liquids Passing Through Micro-Orifices 査読

    Akiomi Ushida, Tomiichi Hasegawa, Shouta Kudou, Masato Kawami, Hiroshige Uchiyama, Takatsune Narumi

    NIHON REOROJI GAKKAISHI38 ( 4-5 ) 215 - 221   2010年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Jet thrusts of several kinds of liquids issuing through small orifices were measured and compared with the predictions from numerical simulations of the Navier-Stokes equations. Reasonable agreements for so-called Newtonian fluids were obtained between the experimental and predicted thrusts for capillaries and orifices with openings of the order of 100 pm size, but the experimental thrusts were found to be below the predictions for orifices of the order of 10 pm. It was suggested that water and glycerol solutions have an elastic property for elongational flows passing through small orifices. As to surfactant aqueous solutions, cationic surfactant(BC) and non-ionic surfactant(AE(23)) provided thrusts lower than those of water, but anionic surfactant(LAS) showed almost the same thrusts as water. Also, lower thrusts were measured for dilute polymer aqueous solutions of PEO(18). A mean elastic stress for the tested liquids was evaluated by using the measured thrusts, and discussion was made on the idea that flows near the wall are affected by an interaction between anions on the surface of orifice and charged molecules of surfactants.

    DOI: 10.1678/rheology.38.215

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  • Experimental Study of Pressure Drops in Liquids Passing through Micro-Orifices in a Range of Low Reynolds Numbers 査読

    Akiomi Ushida, Tomiichi Hasegawa, Takatsune Narumi, Shouta Kudou

    NIHON REOROJI GAKKAISHI38 ( 1 ) 1 - 7   2010年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Micro fluid mechanics is one of interesting fields in modern fluid mechanics, because it is applied to physical, industrial, and biological research. In the present study, pressure drops were measured for some kinds of liquids passing through various micro orifices at low Reynolds numbers. It was found that the measured pressure drops almost agree with the prediction by Navier-Stokes equation for orifices smaller than or equal to 50 micron meters in diameter for water and glycerol aqueous solution, but they increase over the prediction for orifices of 100 and 200 micron meters in diameter. Dimensionless pressure drops appear not to be correlated with Reynolds number for some surfactant solutions.

    DOI: 10.1678/rheology.38.1

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  • Studies on Fluidity and Structure Change of Complex Fluids 査読

    Takatsune Narumi

    NIHON REOROJI GAKKAISHI38 ( 4-5 ) 167 - 173   2010年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Fluidity changes of various complex fluids corresponding to those structure changes have been investigated. Peculiar responses of the fluids were mainly examined in transient flows. Electro-rheological characteristics of liquid crystals were systematically clarified and relatively simple models were developed for both steady and oscillatory flows. Flow induced unstable structure generated with a liquid crystalline polymer were examined in slit flows with a corner. The characteristics of the unstable texture were clarified and the stability of the structure was controlled with the channel design. Typical transient responses of concentrated suspensions due to structure rearrangements of particles have been clarified in re-started flows and LAOS flows. It was found in LAOS experiments that the response waveforms consisted of the transient response after each reversal in the shearing direction, followed by purely viscous behavior. The characteristic strain for the microstructural rearrangement was found to be essentially independent of the oscillation frequency, and showed good agreement with the corresponding characteristic strain obtained from the restarted flows.

    DOI: 10.1678/rheology.38.167

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  • Huge reduction in pressure drop of water, glycerol/water mixture, and aqueous solution of polyethylene oxide in high speed flows through micro-orifices 査読

    Tomiichi Hasegawa, Akiomi Ushida, Takatsune Narumi

    PHYSICS OF FLUIDS21 ( 5 )   2009年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER INST PHYSICS  

    Microfluid mechanics is one of the most exciting research areas in modern fluid mechanics and fluid engineering because of its many potential industrial and biological applications. In the present study, pressure drops (PDs) were measured for water, a 50/50 glycerol/water mixture, and a 0.1% aqueous solution of polyethylene oxide (PEO) 8000 flowing at high velocities through various sizes of micro-orifice. It was found that the measured PD of water and the glycerol/water mixture agrees with the prediction of the Navier-Stokes equation for orifices 100 and 400 mu m in diameter, but it is lower for orifices less than 50 mu m in diameter. In particular, the measured maximum PD was almost two orders of magnitude lower than the prediction for the 10 and 5 mu m diameter orifices. The glycerol/water mixture, possessing a viscosity ten times higher than water, provided nearly the same PDs as water when the reduction was generated. The solution of PEO produced a lower PD than water and the glycerol/water mixture except for the 400 mu m diameter orifice. Several factors, including orifice shape, deformation of orifice foil, wall slip, transition, cavitation, and elasticity were considered but the evidence suggests that the reduction in PD may be caused by wall slip or the elasticity induced in a flow of high elongational rate.

    DOI: 10.1063/1.3129592

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  • Huge reduction in pressure drop of water, glycerol/water mixture, and aqueous solution of polyethylene oxide in high speed flows through micro-orifices 査読

    Tomiichi Hasegawa, Akiomi Ushida, Takatsune Narumi

    PHYSICS OF FLUIDS21 ( 5 )   2009年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER INST PHYSICS  

    Microfluid mechanics is one of the most exciting research areas in modern fluid mechanics and fluid engineering because of its many potential industrial and biological applications. In the present study, pressure drops (PDs) were measured for water, a 50/50 glycerol/water mixture, and a 0.1% aqueous solution of polyethylene oxide (PEO) 8000 flowing at high velocities through various sizes of micro-orifice. It was found that the measured PD of water and the glycerol/water mixture agrees with the prediction of the Navier-Stokes equation for orifices 100 and 400 mu m in diameter, but it is lower for orifices less than 50 mu m in diameter. In particular, the measured maximum PD was almost two orders of magnitude lower than the prediction for the 10 and 5 mu m diameter orifices. The glycerol/water mixture, possessing a viscosity ten times higher than water, provided nearly the same PDs as water when the reduction was generated. The solution of PEO produced a lower PD than water and the glycerol/water mixture except for the 400 mu m diameter orifice. Several factors, including orifice shape, deformation of orifice foil, wall slip, transition, cavitation, and elasticity were considered but the evidence suggests that the reduction in PD may be caused by wall slip or the elasticity induced in a flow of high elongational rate.

    DOI: 10.1063/1.3129592

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  • Slot Coating Flows of Viscoelastic Fluid inside Dies 査読

    Tomohiko Anazawa, Takeaki Tsuda, Hiroshi Yoshiba, Takatsune Narumi, Tomiichi Hasegawa

    NIHON REOROJI GAKKAISHI37 ( 5 ) 239 - 245   2009年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Flows of a viscoelastic fluid in slot die coating were experimentally and theoretically investigated. A viscoelastic fluid having a constant viscosity and a relaxation time (Boger fluid) as well as Newtonian fluid were used as test liquids in a wide range of Weissenberg numbers (0 < Wi < 42). We observed experimentally that the Boger fluid reduced the widthwise non-uniformity of the flow inside a slot die as flow rates were increased. However, this advantage disappeared in the higher flow rate region. This was not observed in the case of Newtonian fluids. In order to depict this behavior, a one-dimensional flow model was presented, where cavity flow and slot flow were combined by means of a planar entrance flow. The pressure drop induced by the planar entrance flow was assumed to characterize the flow from a cavity to a slot. Moreover, an excess pressure drop due to the viscoelasticity was empirically estimated, where the high deformation rates attained in the entrance flow from the cavity to the slot caused the increase of the excess pressure drop. The prediction by this model qualitatively agreed with the experimental results and showed utility of the proposed simple model.

    DOI: 10.1678/rheology.37.239

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  • Slot Coating Flows of Viscoelastic Fluid inside Dies 査読

    Tomohiko Anazawa, Takeaki Tsuda, Hiroshi Yoshiba, Takatsune Narumi, Tomiichi Hasegawa

    NIHON REOROJI GAKKAISHI37 ( 5 ) 239 - 245   2009年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Flows of a viscoelastic fluid in slot die coating were experimentally and theoretically investigated. A viscoelastic fluid having a constant viscosity and a relaxation time (Boger fluid) as well as Newtonian fluid were used as test liquids in a wide range of Weissenberg numbers (0 < Wi < 42). We observed experimentally that the Boger fluid reduced the widthwise non-uniformity of the flow inside a slot die as flow rates were increased. However, this advantage disappeared in the higher flow rate region. This was not observed in the case of Newtonian fluids. In order to depict this behavior, a one-dimensional flow model was presented, where cavity flow and slot flow were combined by means of a planar entrance flow. The pressure drop induced by the planar entrance flow was assumed to characterize the flow from a cavity to a slot. Moreover, an excess pressure drop due to the viscoelasticity was empirically estimated, where the high deformation rates attained in the entrance flow from the cavity to the slot caused the increase of the excess pressure drop. The prediction by this model qualitatively agreed with the experimental results and showed utility of the proposed simple model.

    DOI: 10.1678/rheology.37.239

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  • A Simple Model for the Dynamic Surface Tension of Polymer Solutions 査読

    Tomiichi Hasegawa, Masahiro Karasawa, Akiomi Ushida, Takatsune Narumi

    NIHON REOROJI GAKKAISHI37 ( 5 ) 253 - 258   2009年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Surfactant and polymer Solutions are Usually used under conditions involving transient dynamic surfaces, and therefore the dynamic surface tension (DST) is important in many industrial and biological fields. In a previous paper, we proposed a new mechanical model for surfactant solutions based oil the concept that surfactant molecules rotate during the process of approaching the equilibrium Surface state, which is different from the conventional adsorption theory, and a simple expression of DST was obtained as a function of the surface age. In the present paper, we discussed another model for polymer Solutions, which is based on the similar concept that polymers rotate during the process of approaching the equilibrium surface state. As a result, a simple expression of DST for polymer solutions was derived as a function of the Surface age. The expression was compared with our experimental data, as well as with results reported by other authors, and it was found that they are in good agreement. Furthermore, the characteristic time, which is the only unknown parameter in the model, was shown to be correlated with the weight concentration of the solution regardless of the type Of Solution examined.

    DOI: 10.1678/rheology.37.253

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  • A Simple Model for the Dynamic Surface Tension of Polymer Solutions 査読

    Tomiichi Hasegawa, Masahiro Karasawa, Akiomi Ushida, Takatsune Narumi

    NIHON REOROJI GAKKAISHI37 ( 5 ) 253 - 258   2009年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Surfactant and polymer Solutions are Usually used under conditions involving transient dynamic surfaces, and therefore the dynamic surface tension (DST) is important in many industrial and biological fields. In a previous paper, we proposed a new mechanical model for surfactant solutions based oil the concept that surfactant molecules rotate during the process of approaching the equilibrium Surface state, which is different from the conventional adsorption theory, and a simple expression of DST was obtained as a function of the surface age. In the present paper, we discussed another model for polymer Solutions, which is based on the similar concept that polymers rotate during the process of approaching the equilibrium surface state. As a result, a simple expression of DST for polymer solutions was derived as a function of the Surface age. The expression was compared with our experimental data, as well as with results reported by other authors, and it was found that they are in good agreement. Furthermore, the characteristic time, which is the only unknown parameter in the model, was shown to be correlated with the weight concentration of the solution regardless of the type Of Solution examined.

    DOI: 10.1678/rheology.37.253

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  • Flow induced unstable structure of liquid crystalline polymer solution in L-shaped slit channels 査読

    Takatsune Narumi, Jun Fukada, Satoru Kiryu, Shinji Toga, Tomiichi Hasegawa

    JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME130 ( 8 )   2008年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ASME-AMER SOC MECHANICAL ENG  

    An experimental study has been conducted on unstable structures induced in two-dimensional slit flows of liquid crystalline polymer solution. 50 wt % aqueous solution of hydroxyl-propylcellulose (HPC) was utilized as a test fluid and its flow behavior in L-shaped slit channels with a cross section of 1 mm height and 16 mm width was measured optically. The inner corner of the L-shaped channel was rounded off in order to clarify the influence of the radius of curvature on the unstable behavior. A conversing curved channel was also tested. The flow patterns of the HPC solution in the channels were visualized with two crossed polarizers and we observed that typical wavy textures generated in the upstream of the corner almost disappeared after the corner flow. However, an unstable texture was developed again only from the inner corner in downstream flow. The fluctuation of the orientation angle and dichroism were also measured with a laser opto-rheometric system and it was found that the unstable behaviors of the HPC solution have periodic oscillatory characteristics at a typical frequency. In the inner side flow after the corner, the periodic motion became larger toward the downstream and then higher harmonic oscillations were superimposed. Larger rounding off of the inner corner suppressed the redevelopment of unstable behavior, and it is considered that the rapid regrowth of unstable behavior was caused by rapid deceleration at the corner flow. Moreover, the unstable structure was stabilized with an accelerated (elongated) region in the corner flow and the converging channel was helpful to obtain a stable structure in the downstream region.

    DOI: 10.1115/1.2956604

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  • Modeling and measurement of the dynamic surface tension of surfactant solutions 査読

    Tomiichi Hasegawa, Masahiro Karasawa, Takatsune Narumi

    JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME130 ( 8 )   2008年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ASME-AMER SOC MECHANICAL ENG  

    Surfactant solutions are usually used under conditions accompanied by transient dynamic surfaces, and therefore the dynamic surface tension (DST) is important in many industrial processes. Theories regarding DST have been developed exclusively on the adsorption theory that molecules are transported from bulk solution to the interface. However, the adsorption theory is not closed and requires another relationship between the interfacial concentration of the adsorbing molecules and the bulk concentration of molecules near and at the surface, which at present is based on assumptions. In addition, DST obtained by the adsorption theory contains several parameters that must be determined beforehand, and it is not simple to use for practical purposes. Here, we propose a new model based on the concept that surfactant molecules rotate during the process reaching the equilibrium surface state, which is different from the conventional adsorption theory, and we obtained a simple expression of DST as a function of the surface age. In addition, an experiment was carried out to determine DST by measuring the period and weight of droplets falling from a capillary. The expression by the proposed model was compared with the results of this experiment and with those reported previously by several other authors, and good agreement was obtained. Furthermore, the characteristic time in the model was shown to be correlated with the concentrations of solutions regardless of the type of solutions examined.

    DOI: 10.1115/1.2956597

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  • Modeling and measurement of the dynamic surface tension of surfactant solutions 査読

    Tomiichi Hasegawa, Masahiro Karasawa, Takatsune Narumi

    JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME130 ( 8 )   2008年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ASME-AMER SOC MECHANICAL ENG  

    Surfactant solutions are usually used under conditions accompanied by transient dynamic surfaces, and therefore the dynamic surface tension (DST) is important in many industrial processes. Theories regarding DST have been developed exclusively on the adsorption theory that molecules are transported from bulk solution to the interface. However, the adsorption theory is not closed and requires another relationship between the interfacial concentration of the adsorbing molecules and the bulk concentration of molecules near and at the surface, which at present is based on assumptions. In addition, DST obtained by the adsorption theory contains several parameters that must be determined beforehand, and it is not simple to use for practical purposes. Here, we propose a new model based on the concept that surfactant molecules rotate during the process reaching the equilibrium surface state, which is different from the conventional adsorption theory, and we obtained a simple expression of DST as a function of the surface age. In addition, an experiment was carried out to determine DST by measuring the period and weight of droplets falling from a capillary. The expression by the proposed model was compared with the results of this experiment and with those reported previously by several other authors, and good agreement was obtained. Furthermore, the characteristic time in the model was shown to be correlated with the concentrations of solutions regardless of the type of solutions examined.

    DOI: 10.1115/1.2956597

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  • Flow induced unstable structure of liquid crystalline polymer solution in L-shaped slit channels 査読

    Takatsune Narumi, Jun Fukada, Satoru Kiryu, Shinji Toga, Tomiichi Hasegawa

    JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME130 ( 8 )   2008年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ASME-AMER SOC MECHANICAL ENG  

    An experimental study has been conducted on unstable structures induced in two-dimensional slit flows of liquid crystalline polymer solution. 50 wt % aqueous solution of hydroxyl-propylcellulose (HPC) was utilized as a test fluid and its flow behavior in L-shaped slit channels with a cross section of 1 mm height and 16 mm width was measured optically. The inner corner of the L-shaped channel was rounded off in order to clarify the influence of the radius of curvature on the unstable behavior. A conversing curved channel was also tested. The flow patterns of the HPC solution in the channels were visualized with two crossed polarizers and we observed that typical wavy textures generated in the upstream of the corner almost disappeared after the corner flow. However, an unstable texture was developed again only from the inner corner in downstream flow. The fluctuation of the orientation angle and dichroism were also measured with a laser opto-rheometric system and it was found that the unstable behaviors of the HPC solution have periodic oscillatory characteristics at a typical frequency. In the inner side flow after the corner, the periodic motion became larger toward the downstream and then higher harmonic oscillations were superimposed. Larger rounding off of the inner corner suppressed the redevelopment of unstable behavior, and it is considered that the rapid regrowth of unstable behavior was caused by rapid deceleration at the corner flow. Moreover, the unstable structure was stabilized with an accelerated (elongated) region in the corner flow and the converging channel was helpful to obtain a stable structure in the downstream region.

    DOI: 10.1115/1.2956604

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  • Solid-like properties of liquid crystal in smectic phase controlled with electric field applied 査読

    Takatsune Narumi, Hitoshi Uematsu, Tomiichi Hasegawa

    XVTH INTERNATIONAL CONGRESS ON RHEOLOGY - THE SOCIETY OF RHEOLOGY 80TH ANNUAL MEETING, PTS 1 AND 21027   484 - +   2008年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

    Electro-rheological characteristics of a liquid crystal (8CB) in smectic-A phase were investigated utilizing a parallel-plate type rheometer under the stress control mode. Solid like behavior of the liquid crystal under DC or AC electric fields were mainly examined. Bingham-like properties were observed and yield stress measured was affected with the electric field conditions. When the electric field strength was low, the yield stress was almost the same as that obtained under no electric field. Above a threshold of DC electric field, the yield stress increased and then became constant. An opposite tendency was observed under AC electric fields. In order to clarify the yield process in detail, the structure of the liquid crystal between two parallel plates was directly observed with a polarizing optical system. Under the DC electric fields, we found there were partially collapsed structures at the first stage of yield process and then large-scale deformation was generated. We had also conducted a strain recovery test under small strain conditions where the partially collapsed structures were observed. It was found that the structure in this region had partially elastic recoverable strain.

    DOI: 10.1063/1.2964736

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  • Experimental study on pressure loss of CTAB/NaSal aqueous solution through slots and a capillary 査読

    Makoto Okawara, Tomiichi Hasegawa, Yoshihiko Iino, Takatsune Narumi

    NIHON REOROJI GAKKAISHI36 ( 3 ) 137 - 143   2008年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Aqueous solutions of cetyltrimethylanimonium bromide (CTAB) and sodium salicylate (NaSal) were made to flow through two-dimensional slots and a capillary, and pressure losses Delta P were measured under various conditions to investigate its flow properties. In the results with slot flow, the flow curves relating Delta P to the apparent elongational rate consisted of three characteristic regions. In the first region of low flow rate, the flow curve showed a gentle slope with the pressure loss increasing with elongational rate. In the second region of intermediate flow rate, Delta P increased sharply, which was thought to be caused by flow induced structure (FIS). In the third region of relatively high flow rate, the slope of the flow curve became gentle again. Here, it should be noted that Delta P in the third region was much higher than that in the first region; for example, the third region provides one order of magnitude larger Delta P than the first region for the concentration of CTAB (C-d) = 3 x 10(-2) mol/L solutions.. and it gives two or three orders of magnitude larger Delta P than the first region for C-d = 5 x 10(-4) mol/L solutions. Furthermore, the flow field was visualized using reflex powders and a laser light sheet in slot flows. Observations of the flow field indicated that there are three types of flow field corresponding to the three regions of the flow curve. The first region showed a Newtonian-like flow field. The second region exhibited vortices and a contraction flow upstream of the entrance. In the third region, the vortices and the contraction flow fluctuated with increase in elongational rate. On the other hand, experiments regarding the pressure loss in capillary flow for C-d = 3 x 10(-4) mol/L solutions showed the same character as slot flow. For C-d = 5 x 10(-2) mol/L solutions, however, the character of the capillary flow curve was completely different from that of slot flow, and the flow curve of capillary flow was almost a normal type of Newtonian viscous flow. Consequently, we postulated that a considerable FIS is generated in the flow around the inlet of the capillary, but it collapsed in the downstream capillary flow for such dilute solutions as C-d = 5 x 10(-4) mol/L.

    DOI: 10.1678/rheology.36.137

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  • Experimental study on pressure loss of CTAB/NaSal aqueous solution through slots and a capillary 査読

    Makoto Okawara, Tomiichi Hasegawa, Yoshihiko Iino, Takatsune Narumi

    NIHON REOROJI GAKKAISHI36 ( 3 ) 137 - 143   2008年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Aqueous solutions of cetyltrimethylanimonium bromide (CTAB) and sodium salicylate (NaSal) were made to flow through two-dimensional slots and a capillary, and pressure losses Delta P were measured under various conditions to investigate its flow properties. In the results with slot flow, the flow curves relating Delta P to the apparent elongational rate consisted of three characteristic regions. In the first region of low flow rate, the flow curve showed a gentle slope with the pressure loss increasing with elongational rate. In the second region of intermediate flow rate, Delta P increased sharply, which was thought to be caused by flow induced structure (FIS). In the third region of relatively high flow rate, the slope of the flow curve became gentle again. Here, it should be noted that Delta P in the third region was much higher than that in the first region; for example, the third region provides one order of magnitude larger Delta P than the first region for the concentration of CTAB (C-d) = 3 x 10(-2) mol/L solutions.. and it gives two or three orders of magnitude larger Delta P than the first region for C-d = 5 x 10(-4) mol/L solutions. Furthermore, the flow field was visualized using reflex powders and a laser light sheet in slot flows. Observations of the flow field indicated that there are three types of flow field corresponding to the three regions of the flow curve. The first region showed a Newtonian-like flow field. The second region exhibited vortices and a contraction flow upstream of the entrance. In the third region, the vortices and the contraction flow fluctuated with increase in elongational rate. On the other hand, experiments regarding the pressure loss in capillary flow for C-d = 3 x 10(-4) mol/L solutions showed the same character as slot flow. For C-d = 5 x 10(-2) mol/L solutions, however, the character of the capillary flow curve was completely different from that of slot flow, and the flow curve of capillary flow was almost a normal type of Newtonian viscous flow. Consequently, we postulated that a considerable FIS is generated in the flow around the inlet of the capillary, but it collapsed in the downstream capillary flow for such dilute solutions as C-d = 5 x 10(-4) mol/L.

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  • Anomalous reduction in pressure drops of the water flow through micro-orifices in high velocity ranges 査読

    Toraiichi Hasegawa, Akiomi Ushida, Takatsune Narumi

    XVTH INTERNATIONAL CONGRESS ON RHEOLOGY - THE SOCIETY OF RHEOLOGY 80TH ANNUAL MEETING, PTS 1 AND 21027   991 - +   2008年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

    Micro-fluid mechanics and its application is one of the most attracting subjects in recent fluid mechanics and fluid engineering. We measured the pressure drop in water flowing through micro-orifices in high velocities approaching two hundreds meters per second at the maximum. It was found that the measured pressure drop agrees with the prediction of Navier-Stokes equation for the orifice of 100 mu m diameter, but it is lower than the prediction for the orifices less than 50 mu m diameter, especially almost two orders of magnitude lower for 10 mu m and 5 mu m diameters. This huge reduction was confirmed to have no relation to the orifice shape whether the corner of the orifice hole is round or sharp. Also, deformation of orifice foils by pressurization was not a factor of this phenomenon.

    DOI: 10.1063/1.2964919

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  • Anomalous reduction in pressure drops of the water flow through micro-orifices in high velocity ranges 査読

    Toraiichi Hasegawa, Akiomi Ushida, Takatsune Narumi

    XVTH INTERNATIONAL CONGRESS ON RHEOLOGY - THE SOCIETY OF RHEOLOGY 80TH ANNUAL MEETING, PTS 1 AND 21027   991 - +   2008年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

    Micro-fluid mechanics and its application is one of the most attracting subjects in recent fluid mechanics and fluid engineering. We measured the pressure drop in water flowing through micro-orifices in high velocities approaching two hundreds meters per second at the maximum. It was found that the measured pressure drop agrees with the prediction of Navier-Stokes equation for the orifice of 100 mu m diameter, but it is lower than the prediction for the orifices less than 50 mu m diameter, especially almost two orders of magnitude lower for 10 mu m and 5 mu m diameters. This huge reduction was confirmed to have no relation to the orifice shape whether the corner of the orifice hole is round or sharp. Also, deformation of orifice foils by pressurization was not a factor of this phenomenon.

    DOI: 10.1063/1.2964919

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  • Drag reduction in the flow of aqueous solutions of detergent through mesh screens 査読

    Keiko Amaki, Tomiichi Hasegawa, Takatsune Narumi

    NIHON REOROJI GAKKAISHI36 ( 3 ) 125 - 131   2008年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    An experimental study was conducted on the flow of aqueous solutions of detergent through mesh screens to mimic cloth washing. Pressure losses across the mesh screens were measured for water, dilute polymer and several aqueous detergent solutions. A reduction of pressure losses was observed for the flow of aqueous solutions of low molecular weight surfactants such as Laurylether (AE), Laurylbenzene-sulfonic acid-sodiumsalt (LAS), Benzalkonium-chloride (BC) Sodium-dodecyl-sulfate (SDS), and Hexadecyltrimetyl-ammonium-bromide (CTAB), but not for the high molecular weight polymers like Polyethylene-oxide (PEO18) and Polyacrylamide (PAA), through mesh screens. A flow visualization experiment was carried out to observe the flow pattern upstream and downstream of the mesh screen. Photographic images revealed that, instead of an expected large converging flow from the upstream section into the screen opening as in orifice flow, the bulk of the liquid entering the screen aperture took the form of a liquid column of similar diameter as the inlet tube. Based on this observation, a flow model, which led to a new set of definitions of Reynolds number and drag coefficient, was proposed. Good correlations of drag coefficient and Reynolds number were obtained for all test solutions, and the drag reduction phenomenon was manifested for detergent aqueous solutions.

    DOI: 10.1678/rheology.36.125

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  • Drag reduction in the flow of aqueous solutions of detergent through mesh screens 査読

    Keiko Amaki, Tomiichi Hasegawa, Takatsune Narumi

    NIHON REOROJI GAKKAISHI36 ( 3 ) 125 - 131   2008年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    An experimental study was conducted on the flow of aqueous solutions of detergent through mesh screens to mimic cloth washing. Pressure losses across the mesh screens were measured for water, dilute polymer and several aqueous detergent solutions. A reduction of pressure losses was observed for the flow of aqueous solutions of low molecular weight surfactants such as Laurylether (AE), Laurylbenzene-sulfonic acid-sodiumsalt (LAS), Benzalkonium-chloride (BC) Sodium-dodecyl-sulfate (SDS), and Hexadecyltrimetyl-ammonium-bromide (CTAB), but not for the high molecular weight polymers like Polyethylene-oxide (PEO18) and Polyacrylamide (PAA), through mesh screens. A flow visualization experiment was carried out to observe the flow pattern upstream and downstream of the mesh screen. Photographic images revealed that, instead of an expected large converging flow from the upstream section into the screen opening as in orifice flow, the bulk of the liquid entering the screen aperture took the form of a liquid column of similar diameter as the inlet tube. Based on this observation, a flow model, which led to a new set of definitions of Reynolds number and drag coefficient, was proposed. Good correlations of drag coefficient and Reynolds number were obtained for all test solutions, and the drag reduction phenomenon was manifested for detergent aqueous solutions.

    DOI: 10.1678/rheology.36.125

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  • Elongational deformation of DNA polymers in micro flow 査読

    Mayumi Ouchi, Takatsune Narumi, Tomiichi Hasegawa, Tsutomu Takahashi, Masataka Shirakashi

    XVTH INTERNATIONAL CONGRESS ON RHEOLOGY - THE SOCIETY OF RHEOLOGY 80TH ANNUAL MEETING, PTS 1 AND 21027   962 - +   2008年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

    Elongational deformation of single DNA molecules in a start-up Couette flow and its relaxation process after the cessation of the flow were investigated with fluorescence microscopy. To clarify the influence of chain interaction, a very dilute solution and a concentrated solution were tested. The concentrated solution was made by mixing labeled T4-DNA with unlabeled salmon-milt-DNA. In addition, the clearance between two plates at the flow section was varied to clarify the gap size effects. The elongation and orientation and relaxation process were observed directly subject to inception of Couette flow in solutions of varying polymer concentration. We found that the maximum length of DNA molecules becomes large and the relaxation time becomes long as concentration of solution increases.

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  • Elongational deformation of DNA polymers in micro flow 査読

    Mayumi Ouchi, Takatsune Narumi, Tomiichi Hasegawa, Tsutomu Takahashi, Masataka Shirakashi

    XVTH INTERNATIONAL CONGRESS ON RHEOLOGY - THE SOCIETY OF RHEOLOGY 80TH ANNUAL MEETING, PTS 1 AND 21027   962 - +   2008年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

    Elongational deformation of single DNA molecules in a start-up Couette flow and its relaxation process after the cessation of the flow were investigated with fluorescence microscopy. To clarify the influence of chain interaction, a very dilute solution and a concentrated solution were tested. The concentrated solution was made by mixing labeled T4-DNA with unlabeled salmon-milt-DNA. In addition, the clearance between two plates at the flow section was varied to clarify the gap size effects. The elongation and orientation and relaxation process were observed directly subject to inception of Couette flow in solutions of varying polymer concentration. We found that the maximum length of DNA molecules becomes large and the relaxation time becomes long as concentration of solution increases.

    DOI: 10.1063/1.2964908

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  • Solid-like properties of liquid crystal in smectic phase controlled with electric field applied 査読

    Takatsune Narumi, Hitoshi Uematsu, Tomiichi Hasegawa

    XVTH INTERNATIONAL CONGRESS ON RHEOLOGY - THE SOCIETY OF RHEOLOGY 80TH ANNUAL MEETING, PTS 1 AND 21027   484 - +   2008年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

    Electro-rheological characteristics of a liquid crystal (8CB) in smectic-A phase were investigated utilizing a parallel-plate type rheometer under the stress control mode. Solid like behavior of the liquid crystal under DC or AC electric fields were mainly examined. Bingham-like properties were observed and yield stress measured was affected with the electric field conditions. When the electric field strength was low, the yield stress was almost the same as that obtained under no electric field. Above a threshold of DC electric field, the yield stress increased and then became constant. An opposite tendency was observed under AC electric fields. In order to clarify the yield process in detail, the structure of the liquid crystal between two parallel plates was directly observed with a polarizing optical system. Under the DC electric fields, we found there were partially collapsed structures at the first stage of yield process and then large-scale deformation was generated. We had also conducted a strain recovery test under small strain conditions where the partially collapsed structures were observed. It was found that the structure in this region had partially elastic recoverable strain.

    DOI: 10.1063/1.2964736

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  • Anomalous reduction in thrust/reaction of water jets issuing from microapertures 査読

    Tomiichi Hasegawa, Hiroshi Watanabe, Takashi Sato, Tohru Watanabe, Masanao Takahashi, Takatsune Narumi, Carlos Tiu

    PHYSICS OF FLUIDS19 ( 5 )   2007年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER INST PHYSICS  

    Thrusts and reactions of water jets issuing through small orifices and thin slots were measured and compared with the predictions from numerical solutions of the Navier-Stokes equations. Reasonable agreements were obtained between the experimental and numerical results for orifices and slots with openings of the order of 1 mm size, but not with those of 10 mu m or less. The experimental results were found to be well below the predictions for apertures of the order of 10 mu m. The difference between the numerically calculated and the measured thrusts/reactions for the small apertures was found to be proportional to the square of the mean velocity. Several possible causes for the observed reduction in jet thrust/reaction in small apertures were examined, but none of them could adequately explain the flow anomaly. (c) 2007 American Institute of Physics.

    DOI: 10.1063/1.2723642

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  • Anomalous reduction in thrust/reaction of water jets issuing from microapertures 査読

    Tomiichi Hasegawa, Hiroshi Watanabe, Takashi Sato, Tohru Watanabe, Masanao Takahashi, Takatsune Narumi, Carlos Tiu

    PHYSICS OF FLUIDS19 ( 5 )   2007年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER INST PHYSICS  

    Thrusts and reactions of water jets issuing through small orifices and thin slots were measured and compared with the predictions from numerical solutions of the Navier-Stokes equations. Reasonable agreements were obtained between the experimental and numerical results for orifices and slots with openings of the order of 1 mm size, but not with those of 10 mu m or less. The experimental results were found to be well below the predictions for apertures of the order of 10 mu m. The difference between the numerically calculated and the measured thrusts/reactions for the small apertures was found to be proportional to the square of the mean velocity. Several possible causes for the observed reduction in jet thrust/reaction in small apertures were examined, but none of them could adequately explain the flow anomaly. (c) 2007 American Institute of Physics.

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  • Measurement of dynamic surface tension of surfactant solutions 査読

    Masahiro Karasawa, Tomiichi Hasegawa, Takatsune Narumi

    NIHON REOROJI GAKKAISHI35 ( 5 ) 265 - 271   2007年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Surface-active agents (surfactants) have been used in washing, printing, and medical science to improve efficiency in processing but often cause complicated problems that remain unresolved. As these problems have marked effects on the quality of the final product, basic research to determine solutions is necessary. We observed liquids dripping out of an aperture at relatively low Reynolds numbers using a CCD camera, measured mass and velocity of falling drops, and estimated the dynamic surface tension. Several aqueous solutions of surfactants were used: polyoxyethylene (10) lauryl ether, polyoxyethylene (100) stearyl ether, etc. The momentum equation applied to the falling drop was simplified and an equation was obtained for measuring the dynamic surface tension. It was shown that this equation is useful and dynamic surface tensions were measured for several kinds of aqueous surfactant solutions. The dynamic surface tension was found to depend on the molecular weight of the hydrophilic group and the normalized dynamic surface tension is correlated with the parameter (surface age)x(molecular weight of the hydrophilic group).

    DOI: 10.1678/rheology.35.265

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  • Electro-rheological properties of liquid crystal in high shear rate region 査読

    Takatsune Narumi, Hiroyoshi Maeda, Hiroyuki Yoshizawa, Tomiichi Hasegawa

    NIHON REOROJI GAKKAISHI35 ( 2 ) 85 - 91   2007年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Electro-rheological properties of liquid crystals have been investigated utilizing a parallel-plate type rheometer and a two-dimensional minute channel. A liquid crystal with high specific resistance (LC only) and that with a conductive dopant (LC+TBAB) were tested in order to clarify the influence of electric instability on the ER effect. Flow curves including shear-thinning region were empirically modeled with Carreau type equation from parallel plate test, and the ER effects in the minute channel were numerically predicted with the model. In the case of LC only, the prediction of the model was in good agreement with the experimental. Lower ER effect was obtained with LC+TBAB under DC electric field, where the electroconvection was generated, and the model was partially useful for the prediction. In this case, the influence of the electric field strength on the characteristic time of the model was more complicated than that of the LC only. The transient response of the ER effect at the onset of the electric field was also measured, and almost same response was obtained for all conditions in our test.

    DOI: 10.1678/rheology.35.85

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  • Electro-rheological properties of liquid crystal in high shear rate region 査読

    Takatsune Narumi, Hiroyoshi Maeda, Hiroyuki Yoshizawa, Tomiichi Hasegawa

    NIHON REOROJI GAKKAISHI35 ( 2 ) 85 - 91   2007年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Electro-rheological properties of liquid crystals have been investigated utilizing a parallel-plate type rheometer and a two-dimensional minute channel. A liquid crystal with high specific resistance (LC only) and that with a conductive dopant (LC+TBAB) were tested in order to clarify the influence of electric instability on the ER effect. Flow curves including shear-thinning region were empirically modeled with Carreau type equation from parallel plate test, and the ER effects in the minute channel were numerically predicted with the model. In the case of LC only, the prediction of the model was in good agreement with the experimental. Lower ER effect was obtained with LC+TBAB under DC electric field, where the electroconvection was generated, and the model was partially useful for the prediction. In this case, the influence of the electric field strength on the characteristic time of the model was more complicated than that of the LC only. The transient response of the ER effect at the onset of the electric field was also measured, and almost same response was obtained for all conditions in our test.

    DOI: 10.1678/rheology.35.85

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  • Thrusts and pressure losses of the flow of water passing through micro orifices 査読

    Masanao Takahashi, Tomiichi Hasegawa, Takatsune Narumi

    FEDSM 2007: PROCEEDINGS OF THE 5TH JOINT AMSE/JSME FLUIDS ENGINEERING SUMMER CONFERENCE VOL 1, PTS A AND B   1657 - 1660   2007年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER SOC MECHANICAL ENGINEERS  

    Jet thrusts and pressure losses of water through micro orifices and slots were measured by using an electric balance and a pressure transducer respectively. It was found that the thrusts for the orifice of 1mm order agree with the result of numerical simulation using Navier-Stokes equation, but the thrusts for the fine apertures of the order 10 mu m are well below those predicted. Similarly, the experimental result indicated that the pressure losses for the orifice of 1mm order agree with the theoretical one, but those for the fine apertures of the order 10 mu m significantly decrease.

    DOI: 10.1115/FEDSM2007-37199

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  • Estimation of dynamic surface tension of surfactant solutions 査読

    Masahiro Karasawa, Tomiichi Hasegawa, Takatsune Narumi

    FEDSM 2007: PROCEEDINGS OF THE 5TH JOINT AMSE/JSME FLUIDS ENGINEERING SUMMER CONFERENCE VOL 1, PTS A AND B   1653 - 1656   2007年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER SOC MECHANICAL ENGINEERS  

    Surfactants have been used in many fields for improving efficiency in processing but often cause some problems complicated and unsolved. We observed liquids dripping out of an aperture at relatively low Reynolds numbers using a CCD camera, measured mass and velocity of falling drops, and estimated the dynamic surface tension of several aqueous solutions of surfactants: polyoxyethylene (23) lauryl ether, polyoxyethylene (20) stearyl ether, etc. It was concluded that the molecular weight of hydrophilic group in surfactants greatly affects the dynamic surface tension of the solutions at the same mol concentration. We provided the normalized dynamic surface tension and it was shown to be correlated with the surface age multiplied by the molecular weight of the hydrophilic group of the surfactant. A model was presented by considering the dynamic behavior of surfactant molecules approaching a static state to predict the normalized dynamic surface tension of surfactants. The predictions of this model agreed well with the experimental results.

    DOI: 10.1115/FEDSM2007-37197

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  • Thrusts and pressure losses of the flow of water passing through micro orifices 査読

    Masanao Takahashi, Tomiichi Hasegawa, Takatsune Narumi

    FEDSM 2007: PROCEEDINGS OF THE 5TH JOINT AMSE/JSME FLUIDS ENGINEERING SUMMER CONFERENCE VOL 1, PTS A AND B   1657 - 1660   2007年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER SOC MECHANICAL ENGINEERS  

    Jet thrusts and pressure losses of water through micro orifices and slots were measured by using an electric balance and a pressure transducer respectively. It was found that the thrusts for the orifice of 1mm order agree with the result of numerical simulation using Navier-Stokes equation, but the thrusts for the fine apertures of the order 10 mu m are well below those predicted. Similarly, the experimental result indicated that the pressure losses for the orifice of 1mm order agree with the theoretical one, but those for the fine apertures of the order 10 mu m significantly decrease.

    DOI: 10.1115/FEDSM2007-37199

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  • Anomalous behavior in interference fringes of a laser through a slot flow 査読

    Makoto Okawara, Tomiichi Hasegawa, Yoshihiko Iino, Takatsune Narumi

    FEDSM 2007: PROCEEDINGS OF THE 5TH JOINT AMSE/JSME FLUIDS ENGINEERING SUMMER CONFERENCE VOL 1, PTS A AND B   1649 - 1652   2007年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER SOC MECHANICAL ENGINEERS  

    Flows through a slot were optically examined by Mach-Zehnder interferometer in a range of low Reynolds numbers. Fluids examined in this study are the so-called Newtonian fluids: ion exchange water, silicone oils and liquid paraffin. It was found that interference fringes of laser lights are anomalously deformed around the slot. The deformation was small but non-zero even for ion exchange water. It was getting larger and changing with time for silicone oils and liquid paraffin. Moreover, some bright lines appeared around the slot. Also it was found that there is some region around the slot where the refractive index is higher than that in the surrounding region. The flow field was visualized using reflex powders and a laser light sheet. and found to be a normal converging and diverging flows expected for the low Reynolds number realized in the present experiment. These facts mean that the region around the slot is apparently in lower temperature and it is very hard to explain it from the heat generation by the I-low around the slot.

    DOI: 10.1115/FEDSM2007-37196

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  • Flow induced unstable structure of liquid crystalline polymer solution in L-shaped slit channels 査読

    Takatsune Narumi, Jun Fukada, Tomiichi Hasegawa

    FEDSM 2007: PROCEEDINGS OF THE 5TH JOINT AMSE/JSME FLUIDS ENGINEERING SUMMER CONFERENCE VOL 1, PTS A AND B   1609 - 1614   2007年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER SOC MECHANICAL ENGINEERS  

    An experimental study has been conducted on unstable structures induced in two dimensional slit flows of liquid crystalline polymer solution. 50wt% aqueous solution of hydroxyl-propylcellulose (HPC) was utilized as a test fluid and its flow behavior in L-shaped slit channels with cross section of 1mm height and 16mm width was measured optically. The inner corner of the L-shaped channel was rounded off in order to clarify the influence of the radius of curvature on the unstable behavior. A conversing curved channel was also tested. The flow patterns of HPC solution in the channels were visualized with two crossed polarizers and we observed that typical wavy textures generated in the upstream of the corner almost disappeared after the corner flow. However, an unstable texture was developed again only from the inner corner in downstream flow. The fluctuation of orientation angle and dichroism were also measured with a laser opto-rheometric system and it was found that the unstable behaviors of HPC solution have periodic oscillatory characteristics at a typical frequency. In the inner side flow after the corner, the periodic motion became larger toward the downstream and then higher harmonic oscillations were superimposed. Larger rounding off of the inner corner suppressed the redevelopment of unstable behavior, and it is considered that the rapid re-growth of unstable behavior was caused by rapid deceleration at the comer flow. Moreover, the unstable structure was stabilized with accelerated (elongated) region in the corner flow and the converging channel was helpful to obtain stable structure in the downstream region.

    DOI: 10.1115/FEDSM2007-37169

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  • Estimation of dynamic surface tension of surfactant solutions 査読

    Masahiro Karasawa, Tomiichi Hasegawa, Takatsune Narumi

    FEDSM 2007: PROCEEDINGS OF THE 5TH JOINT AMSE/JSME FLUIDS ENGINEERING SUMMER CONFERENCE VOL 1, PTS A AND B   1653 - 1656   2007年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER SOC MECHANICAL ENGINEERS  

    Surfactants have been used in many fields for improving efficiency in processing but often cause some problems complicated and unsolved. We observed liquids dripping out of an aperture at relatively low Reynolds numbers using a CCD camera, measured mass and velocity of falling drops, and estimated the dynamic surface tension of several aqueous solutions of surfactants: polyoxyethylene (23) lauryl ether, polyoxyethylene (20) stearyl ether, etc. It was concluded that the molecular weight of hydrophilic group in surfactants greatly affects the dynamic surface tension of the solutions at the same mol concentration. We provided the normalized dynamic surface tension and it was shown to be correlated with the surface age multiplied by the molecular weight of the hydrophilic group of the surfactant. A model was presented by considering the dynamic behavior of surfactant molecules approaching a static state to predict the normalized dynamic surface tension of surfactants. The predictions of this model agreed well with the experimental results.

    DOI: 10.1115/FEDSM2007-37197

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  • Anomalous behavior in interference fringes of a laser through a slot flow 査読

    Makoto Okawara, Tomiichi Hasegawa, Yoshihiko Iino, Takatsune Narumi

    FEDSM 2007: PROCEEDINGS OF THE 5TH JOINT AMSE/JSME FLUIDS ENGINEERING SUMMER CONFERENCE VOL 1, PTS A AND B   1649 - 1652   2007年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER SOC MECHANICAL ENGINEERS  

    Flows through a slot were optically examined by Mach-Zehnder interferometer in a range of low Reynolds numbers. Fluids examined in this study are the so-called Newtonian fluids: ion exchange water, silicone oils and liquid paraffin. It was found that interference fringes of laser lights are anomalously deformed around the slot. The deformation was small but non-zero even for ion exchange water. It was getting larger and changing with time for silicone oils and liquid paraffin. Moreover, some bright lines appeared around the slot. Also it was found that there is some region around the slot where the refractive index is higher than that in the surrounding region. The flow field was visualized using reflex powders and a laser light sheet. and found to be a normal converging and diverging flows expected for the low Reynolds number realized in the present experiment. These facts mean that the region around the slot is apparently in lower temperature and it is very hard to explain it from the heat generation by the I-low around the slot.

    DOI: 10.1115/FEDSM2007-37196

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  • Flow induced unstable structure of liquid crystalline polymer solution in L-shaped slit channels 査読

    Takatsune Narumi, Jun Fukada, Tomiichi Hasegawa

    FEDSM 2007: PROCEEDINGS OF THE 5TH JOINT AMSE/JSME FLUIDS ENGINEERING SUMMER CONFERENCE VOL 1, PTS A AND B   1609 - 1614   2007年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER SOC MECHANICAL ENGINEERS  

    An experimental study has been conducted on unstable structures induced in two dimensional slit flows of liquid crystalline polymer solution. 50wt% aqueous solution of hydroxyl-propylcellulose (HPC) was utilized as a test fluid and its flow behavior in L-shaped slit channels with cross section of 1mm height and 16mm width was measured optically. The inner corner of the L-shaped channel was rounded off in order to clarify the influence of the radius of curvature on the unstable behavior. A conversing curved channel was also tested. The flow patterns of HPC solution in the channels were visualized with two crossed polarizers and we observed that typical wavy textures generated in the upstream of the corner almost disappeared after the corner flow. However, an unstable texture was developed again only from the inner corner in downstream flow. The fluctuation of orientation angle and dichroism were also measured with a laser opto-rheometric system and it was found that the unstable behaviors of HPC solution have periodic oscillatory characteristics at a typical frequency. In the inner side flow after the corner, the periodic motion became larger toward the downstream and then higher harmonic oscillations were superimposed. Larger rounding off of the inner corner suppressed the redevelopment of unstable behavior, and it is considered that the rapid re-growth of unstable behavior was caused by rapid deceleration at the comer flow. Moreover, the unstable structure was stabilized with accelerated (elongated) region in the corner flow and the converging channel was helpful to obtain stable structure in the downstream region.

    DOI: 10.1115/FEDSM2007-37169

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  • Flow of dilute colloidal dispersions in water through a small orifice 査読

    Shinji Toga, Tomiichi Hasegawa, Takatsune Narumi

    NIHON REOROJI GAKKAISHI35 ( 3 ) 137 - 145   2007年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Fluctuation of flows through a small orifice has been measured for water and two kinds of colloidal dispersions including fine particles about 100 nm in diameter with 1 % volume fraction in water. In this volume fraction, a surface potential of the particles is composed of an electrostatic repulsion and a van der Waals attraction and it affects flow properties. Experiments clarify that a specific flow instability occurs for water at the Reynolds number about 60, and the dispersion of polystyrene particles having strong repulsion increases the specific flow instability in low salt concentrations(LSC) but makes it disappear in high salt concentrations(HSC). Meanwhile, it is found that the dispersion of silica particles having strong attraction is stable in flows except the specific flow instability in LSC but it suppresses the specific flow instability in HSC as in the case of polystyrene particles. Criterion whether the orifice flow is stable or not is predicted by comparison of the second minimum location of the surface potential and the mean surfaces distance of the particles.

    DOI: 10.1678/rheology.35.137

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  • Flow of dilute colloidal dispersions in water through a small orifice 査読

    Shinji Toga, Tomiichi Hasegawa, Takatsune Narumi

    NIHON REOROJI GAKKAISHI35 ( 3 ) 137 - 145   2007年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Fluctuation of flows through a small orifice has been measured for water and two kinds of colloidal dispersions including fine particles about 100 nm in diameter with 1 % volume fraction in water. In this volume fraction, a surface potential of the particles is composed of an electrostatic repulsion and a van der Waals attraction and it affects flow properties. Experiments clarify that a specific flow instability occurs for water at the Reynolds number about 60, and the dispersion of polystyrene particles having strong repulsion increases the specific flow instability in low salt concentrations(LSC) but makes it disappear in high salt concentrations(HSC). Meanwhile, it is found that the dispersion of silica particles having strong attraction is stable in flows except the specific flow instability in LSC but it suppresses the specific flow instability in HSC as in the case of polystyrene particles. Criterion whether the orifice flow is stable or not is predicted by comparison of the second minimum location of the surface potential and the mean surfaces distance of the particles.

    DOI: 10.1678/rheology.35.137

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  • Measurement of dynamic surface tension of surfactant solutions 査読

    Masahiro Karasawa, Tomiichi Hasegawa, Takatsune Narumi

    NIHON REOROJI GAKKAISHI35 ( 5 ) 265 - 271   2007年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Surface-active agents (surfactants) have been used in washing, printing, and medical science to improve efficiency in processing but often cause complicated problems that remain unresolved. As these problems have marked effects on the quality of the final product, basic research to determine solutions is necessary. We observed liquids dripping out of an aperture at relatively low Reynolds numbers using a CCD camera, measured mass and velocity of falling drops, and estimated the dynamic surface tension. Several aqueous solutions of surfactants were used: polyoxyethylene (10) lauryl ether, polyoxyethylene (100) stearyl ether, etc. The momentum equation applied to the falling drop was simplified and an equation was obtained for measuring the dynamic surface tension. It was shown that this equation is useful and dynamic surface tensions were measured for several kinds of aqueous surfactant solutions. The dynamic surface tension was found to depend on the molecular weight of the hydrophilic group and the normalized dynamic surface tension is correlated with the parameter (surface age)x(molecular weight of the hydrophilic group).

    DOI: 10.1678/rheology.35.265

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  • Flow behavior of Herschel-Bulkley fluid in a slot die 査読

    Masayuki Nagashima, Tomiichi Hasegawa, Takatsune Narumi

    NIHON REOROJI GAKKAISHI34 ( 4 ) 213 - 221   2006年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    To achieve uniform thickness of coated films using non-Newtonian fluids, we are often required well-designed geometries of flow channel in a slot die. This is the case especially for fluids with the properties of both shear thinning and yield stress which is non-negligible in a range of low shear rate such as in an intermittent die coating. In the present work, flow in the slot die has been studied using Herschel-Bulkley fluid expressing both shear thinning and yield stress. The Herschel-Bulkley fluid includes power-law and Bingham fluid models comprehensively. This fluid model is applicable to many real fluids. We derive simplified equations for the outflow distribution as functions of power-law index, yield stress and the geometry parameters of the die. Furthermore, we propose a useful designing method for predicting the optimum geometry so as to guarantee uniformity of outflow from the die slot, based on the Herschel-Bulkley fluid. The value of this method is confirmed by comparing it with experimental results and with previous theoretical results for the power-law and Bingham fluid models.

    DOI: 10.1678/rheology.34.213

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  • Flow behavior of Bingham fluid in a slot die 査読

    Masayuki Nagashima, Tomiichi Hasegawa, Takatsune Narumi

    NIHON REOROJI GAKKAISHI34 ( 2 ) 91 - 96   2006年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    It is necessary to provide well-designed geometries of flow channel in a slot die in order to achieve the uniform thickness of coated films for non-Newtonian fluids, especially for the fluids having nonnegligible yield stress. In this work we have studied the flow in the slot die using Bingham fluid. The present paper derives a model equation for the outflow distribution as functions of the yield stress and the geometries inside the die. Furthermore, we suggest a useful design method to predict an optimum geometry to guarantee the uniformity of outflow from die slot in Bingham fluid. The usefulness of the method is confirmed by an experiment conducted using a corresponding fluid.

    DOI: 10.1678/rheology.34.91

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  • Prediction of flow distribution for Bingham fluid in a slot die 査読

    Masayuki Nagashima, Tomiichi Hasegawa, Takatsune Narumi

    NIHON REOROJI GAKKAISHI34 ( 4 ) 205 - 212   2006年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Designs of flow channel in a slot die are often required to achieve the uniform thickness of coated films for non-Newtonian fluids having nonnegligible yield stress. In previous studies we have proposed a designing method for deriving the optimum geometries of flow channel from a flow distribution model for Bingham fluid. However, it is hard to provide the optimum geometries precisely without manufacturing burden. Therefore, it is useful to substitute simplified asymptotic curves for complex optimum geometries in designing flow channel. But in that case the deviation of outflow from uniformity due to such approximations needs to be checked whether it is within an allowable range or not. In this work we propose a method for predicting the outflow deviation in given geometories of flow channel using Bingham fluid. The usefulness of the method is confirmed by an experiment conducted using a corresponding fluid.

    DOI: 10.1678/rheology.34.205

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  • Flow behavior of Herschel-Bulkley fluid in a slot die 査読

    Masayuki Nagashima, Tomiichi Hasegawa, Takatsune Narumi

    NIHON REOROJI GAKKAISHI34 ( 4 ) 213 - 221   2006年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    To achieve uniform thickness of coated films using non-Newtonian fluids, we are often required well-designed geometries of flow channel in a slot die. This is the case especially for fluids with the properties of both shear thinning and yield stress which is non-negligible in a range of low shear rate such as in an intermittent die coating. In the present work, flow in the slot die has been studied using Herschel-Bulkley fluid expressing both shear thinning and yield stress. The Herschel-Bulkley fluid includes power-law and Bingham fluid models comprehensively. This fluid model is applicable to many real fluids. We derive simplified equations for the outflow distribution as functions of power-law index, yield stress and the geometry parameters of the die. Furthermore, we propose a useful designing method for predicting the optimum geometry so as to guarantee uniformity of outflow from the die slot, based on the Herschel-Bulkley fluid. The value of this method is confirmed by comparing it with experimental results and with previous theoretical results for the power-law and Bingham fluid models.

    DOI: 10.1678/rheology.34.213

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  • Flow behavior of Bingham fluid in a slot die 査読

    Masayuki Nagashima, Tomiichi Hasegawa, Takatsune Narumi

    NIHON REOROJI GAKKAISHI34 ( 2 ) 91 - 96   2006年

     詳細を見る

    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    It is necessary to provide well-designed geometries of flow channel in a slot die in order to achieve the uniform thickness of coated films for non-Newtonian fluids, especially for the fluids having nonnegligible yield stress. In this work we have studied the flow in the slot die using Bingham fluid. The present paper derives a model equation for the outflow distribution as functions of the yield stress and the geometries inside the die. Furthermore, we suggest a useful design method to predict an optimum geometry to guarantee the uniformity of outflow from die slot in Bingham fluid. The usefulness of the method is confirmed by an experiment conducted using a corresponding fluid.

    DOI: 10.1678/rheology.34.91

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  • Prediction of flow distribution for Bingham fluid in a slot die 査読

    Masayuki Nagashima, Tomiichi Hasegawa, Takatsune Narumi

    NIHON REOROJI GAKKAISHI34 ( 4 ) 205 - 212   2006年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC RHEOLOGY, JAPAN  

    Designs of flow channel in a slot die are often required to achieve the uniform thickness of coated films for non-Newtonian fluids having nonnegligible yield stress. In previous studies we have proposed a designing method for deriving the optimum geometries of flow channel from a flow distribution model for Bingham fluid. However, it is hard to provide the optimum geometries precisely without manufacturing burden. Therefore, it is useful to substitute simplified asymptotic curves for complex optimum geometries in designing flow channel. But in that case the deviation of outflow from uniformity due to such approximations needs to be checked whether it is within an allowable range or not. In this work we propose a method for predicting the outflow deviation in given geometories of flow channel using Bingham fluid. The usefulness of the method is confirmed by an experiment conducted using a corresponding fluid.

    DOI: 10.1678/rheology.34.205

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  • Response of concentrated suspensions under large amplitude oscillatory shear flow

    T Narumi, H See, A Suzuki, T Hasegawa

    JOURNAL OF RHEOLOGY49 ( 1 ) 71 - 85   2005年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JOURNAL OF RHEOLOGY AMER INST PHYSICS  

    Concentrated suspensions of non-Brownian spheres dispersed in a Newtonian carrier liquid were placed under large amplitude oscillatory shear flow. It was found that the response wave forms consisted of a transient response after each reversal in the shearing direction, followed by purely viscous behavior. It was thought that rearrangements in the particulate microstructure could account for this transient response. Further, the characteristic strain for the microstructural rearrangement was found to be essentially independent of the oscillation frequency, and showed good agreement with the corresponding characteristic strain obtained from measurements of the transient response after shear reversal in continuous shear experiments. In addition, the fluidity in the oscillatory flow after the transient response was found to be higher than that in the steady flow case. This increase in fluidity was found to depend on the particle size dispersity, with the largest fluidity difference occurring with the monodispersed systems. (C) 2005 The Society of Rheology.

    DOI: 10.1122/1.1814112

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  • Response of concentrated suspensions under large amplitude oscillatory shear flow

    T Narumi, H See, A Suzuki, T Hasegawa

    JOURNAL OF RHEOLOGY49 ( 1 ) 71 - 85   2005年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JOURNAL OF RHEOLOGY AMER INST PHYSICS  

    Concentrated suspensions of non-Brownian spheres dispersed in a Newtonian carrier liquid were placed under large amplitude oscillatory shear flow. It was found that the response wave forms consisted of a transient response after each reversal in the shearing direction, followed by purely viscous behavior. It was thought that rearrangements in the particulate microstructure could account for this transient response. Further, the characteristic strain for the microstructural rearrangement was found to be essentially independent of the oscillation frequency, and showed good agreement with the corresponding characteristic strain obtained from measurements of the transient response after shear reversal in continuous shear experiments. In addition, the fluidity in the oscillatory flow after the transient response was found to be higher than that in the steady flow case. This increase in fluidity was found to depend on the particle size dispersity, with the largest fluidity difference occurring with the monodispersed systems. (C) 2005 The Society of Rheology.

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  • 非ニュートン流体の押出し金型内の流れに関する研究

    津田武明, 長谷川富市, 鳴海敬倫

    日本レオロジー学会誌30 ( 3 ) 133 - 139   2002年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1678/rheology.30.133

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  • 非ニュートン流体の押出し金型内の流れに関する研究

    津田武明, 長谷川富市, 鳴海敬倫

    日本レオロジー学会誌30 ( 3 ) 133 - 139   2002年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1678/rheology.30.133

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  • Transient response of concentrated suspensions after shear reversal

    NARUMI T, SEE H, HONMA Y, HASEGAWA T, TAKAHASHI T, PHAN‐THIEN N

    J. Rheology46 ( 1 ) 295 - 305   2002年

  • 2段分配付押出し金型内の流れに関する研究

    津田武明, 長谷川富市, 鳴海敬倫

    日本レオロジー学会誌30 ( 4 ) 179 - 185   2002年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1678/rheology.30.179

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  • 2段分配付押出し金型内の流れに関する研究

    津田武明, 長谷川富市, 鳴海敬倫

    日本レオロジー学会誌30 ( 4 ) 179 - 185   2002年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1678/rheology.30.179

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  • Transient response of concentrated suspensions after shear reversal

    NARUMI T, SEE H, HONMA Y, HASEGAWA T, TAKAHASHI T, PHAN‐THIEN N

    J. Rheology46 ( 1 ) 295 - 305   2002年

  • Converging and diverging flow of electrorheological fluid in minute channels

    T Narumi, T Hayashibe, T Hasegawa, Y Asako

    INTERNATIONAL JOURNAL OF MODERN PHYSICS B15 ( 6-7 ) 723 - 730   2001年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WORLD SCIENTIFIC PUBL CO PTE LTD  

    We have examined ER effects in very small parallel and non-parallel gaps utilizing conventional ER suspensions. The flow rate reduction due to the electric field applied is measured as the ER effect for parallel, converging diverging and combined channels. The test with the parallel channel under AC or rectangular pulse wave electric fields shows that the ER fluids are helpful for the flow rate control even in a narrow gap with the size about 10 times of particle diameter. In comparison between a converging channel and a diverging one, the former has advantages in magnitude and stability of ER effect Moreover, the converging channel generates larger ER effect than that of the parallel channel with same flow characteristics under no electric field. It is considered that a small area with a higher electric field in the non-parallel channel makes it easy to control the flow rate. further, the multiplier effect of the converging flow of particles and ore increase in electric field along the flow direction generates a larger and stable ER effect. We have also examined with a combined converging and diverging channel and confirmed the similar enhancement in ER effect to the single converging one without the unsymmetrical ER effect due to the flow direction.

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  • Converging and diverging flow of electrorheological fluid in minute channels

    T Narumi, T Hayashibe, T Hasegawa, Y Asako

    INTERNATIONAL JOURNAL OF MODERN PHYSICS B15 ( 6-7 ) 723 - 730   2001年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WORLD SCIENTIFIC PUBL CO PTE LTD  

    We have examined ER effects in very small parallel and non-parallel gaps utilizing conventional ER suspensions. The flow rate reduction due to the electric field applied is measured as the ER effect for parallel, converging diverging and combined channels. The test with the parallel channel under AC or rectangular pulse wave electric fields shows that the ER fluids are helpful for the flow rate control even in a narrow gap with the size about 10 times of particle diameter. In comparison between a converging channel and a diverging one, the former has advantages in magnitude and stability of ER effect Moreover, the converging channel generates larger ER effect than that of the parallel channel with same flow characteristics under no electric field. It is considered that a small area with a higher electric field in the non-parallel channel makes it easy to control the flow rate. further, the multiplier effect of the converging flow of particles and ore increase in electric field along the flow direction generates a larger and stable ER effect. We have also examined with a combined converging and diverging channel and confirmed the similar enhancement in ER effect to the single converging one without the unsymmetrical ER effect due to the flow direction.

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  • 非ニュートン流体の押出し金型内の流れに関する研究(第1報,べき乗則流体の解析)

    津田 武明, 長谷川 富市, 鳴海 敬倫

    日本機械学会論文集B編67 ( 661 ) 2174 - 2179   2001年

  • ジェット反力法を利用した簡易型流体弾性力測定装置の開発

    浅間英夫, 長谷川富市, 鳴海敬倫

    日本レオロジー学会誌29 ( 3 ) 131 - 137   2001年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1678/rheology.29.131

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  • 非ニュートン流体の押出し金型内の流れに関する研究(第1報,べき乗則流体の解析)

    津田 武明, 長谷川 富市, 鳴海 敬倫

    日本機械学会論文集B編67 ( 661 ) 2174 - 2179   2001年

  • ジェット反力法を利用した簡易型流体弾性力測定装置の開発

    浅間英夫, 長谷川富市, 鳴海敬倫

    日本レオロジー学会誌29 ( 3 ) 131 - 137   2001年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1678/rheology.29.131

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  • 高分子溶液および液晶高分子溶液の流体工学的研究

    日本レオロジー学会誌26 ( 4 ) 215 - 221   1998年

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  • 高分子溶液および液晶高分子溶液の流体工学的研究

    日本レオロジー学会誌26 ( 4 ) 215 - 221   1998年

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  • 2面の正弦波振動による高分子溶液のスクイーズ流れ

    鳴海 敬倫, 八木 敏之, 長谷川 富市, 山根 隆一郎

    日本機械学会論文集,B編58 ( 548 ) 1063 - 1070   1992年

  • 高分子溶液のスクイーズ流れに関する研究(流体の物性の変化による伝達荷重への影響)

    日本機械学会論文集,B編58 ( 556 ) 3522 - 3530   1992年

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  • 2面の正弦波振動による高分子溶液のスクイーズ流れ

    鳴海 敬倫, 八木 敏之, 長谷川 富市, 山根 隆一郎

    日本機械学会論文集,B編58 ( 548 ) 1063 - 1070   1992年

  • 高分子溶液のスクイーズ流れに関する研究(流体の物性の変化による伝達荷重への影響)

    日本機械学会論文集,B編58 ( 556 ) 3522 - 3530   1992年

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  • 高分子溶液の定速スクイーズ流れに関する実験的研究(離反運動時の伝達荷重の測定と解析)

    鳴海敬倫, 長谷川富市, 関野龍男

    日本機械学会論文集,B編57 ( 535 ) 958 - 965   1991年

  • 高分子溶液の定速スクイーズ流れに関する実験的研究(離反運動時の伝達荷重の測定と解析)

    鳴海敬倫, 長谷川富市, 関野龍男

    日本機械学会論文集,B編57 ( 535 ) 958 - 965   1991年

  • 高分子溶液の定速スクイーズ流れに関する実験的研究(接近運動時および運動終了後の伝達荷重の測定)

    鳴海敬倫, 関野竜男, 長谷川富市

    日本機械学会論文集,B編56 ( 529 ) 2551 - 2557   1990年

  • 高分子溶液の定速スクイーズ流れに関する実験的研究(接近運動時および運動終了後の伝達荷重の測定)

    鳴海敬倫, 関野竜男, 長谷川富市

    日本機械学会論文集,B編56 ( 529 ) 2551 - 2557   1990年

  • 希薄高分子溶液の逆スクイズ流れに関する実験的研究(第2報,Separan水溶液の場合)

    鳴海 敬倫, 細川 喜弘, 長谷川 富市, 近野 正昭

    日本機械学会論文集,B編55 ( 520 ) 3691 - 3696   1989年

  • 希薄高分子溶液の逆スクイズ流れに関する実験的研究(第2報,Separan水溶液の場合)

    鳴海 敬倫, 細川 喜弘, 長谷川 富市, 近野 正昭

    日本機械学会論文集,B編55 ( 520 ) 3691 - 3696   1989年

  • 転がり始める球面-平面間の流体の流動に関する実験的研究

    鳴海 敬倫, 長谷川 富市, 細川 喜弘

    日本機械学会論文集,B編53 ( 496 ) 3504 - 3509   1987年

  • 転がり始める球面-平面間の流体の流動に関する実験的研究

    鳴海 敬倫, 長谷川 富市, 細川 喜弘

    日本機械学会論文集,B編53 ( 496 ) 3504 - 3509   1987年

  • 粘弾性流体のスクイズ流れに関する実験的研究(第1報,球面-平面間の流動に及ぼす流体特性の影響)

    鳴海 敬倫, 長谷川 富市

    日本機械学会論文集,B編52 ( 475 ) 1207 - 1214   1986年

  • 粘弾性流体のスクイズ流れに関する実験的研究(第1報,球面-平面間の流動に及ぼす流体特性の影響)

    鳴海 敬倫, 長谷川 富市

    日本機械学会論文集,B編52 ( 475 ) 1207 - 1214   1986年

▶ 全件表示

書籍等出版物

  • 流体力学ハンドブック,(第23章)

    丸善  1998年 

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  • Handbook of Fluid Mechanics, Chapter 23

    Maruzen  1998年 

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MISC

  • 大学2年次文理混合クラスでの「AIって使える」への意識転換

    熊野英和, 田中一裕, 鳴海敬倫

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)80th   ROMBUNNO.21a‐PA1‐2   2019年9月

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    記述言語:日本語  

    J-GLOBAL

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  • 流動による流体の内部構造変化の可視化 複雑流体の流動複屈折測定の原理と測定例

    佐藤大祐, 鳴海敬倫

    ながれ38 ( 4 ) 248‐255   2019年8月

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    記述言語:日本語  

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  • 複合触覚センシングのためのフレキシブル圧力・曲げセンサ

    寒川雅之, 高橋拓海, 富田亮, 安部隆, 鳴海敬倫

    電子情報通信学会技術研究報告119 ( 103(OME2019 12-16) ) 7‐10   2019年6月

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    記述言語:日本語  

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  • 微小サイズのスリットを通過する界面活性剤水溶液のスタートアップ挙動に関する偏光イメージング解析

    牛田晃臣, 岩崎光, 佐藤大祐, 鳴海敬倫, 高橋勉, 斎藤啓太, 長谷川富市

    日本レオロジー学会年会講演予稿集46th   141‐142   2019年5月

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    記述言語:日本語  

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  • 金属板表面における付着汚れを対象とした流水洗浄におけるマイクロバブル混合の効果

    小林嵩季, 牛田晃臣, 瀬戸光一, 樋渡忠, 鳴海敬倫

    日本機械学会北陸信越支部総会・講演会講演論文集(CD-ROM)56th   ROMBUNNO.G023   2019年3月

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  • キャビティ部を有する矩形流路を通過する界面活性剤水溶液の流動誘起構造

    山田隼也, 牛田晃臣, 佐藤大祐, 鳴海敬倫

    日本機械学会北陸信越支部総会・講演会講演論文集(CD-ROM)56th   ROMBUNNO.G024   2019年3月

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  • 急縮小急拡大流れにおける界面活性剤水溶液の特異流動特性

    牛田晃臣, 佐藤大祐, 鳴海敬倫, 高橋勉, 大沼隼志, 伊藤雅利, 長谷川富市

    日本機械学会北陸信越支部総会・講演会講演論文集(CD-ROM)56th   ROMBUNNO.G025   2019年3月

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  • フッ素エラストマとCNT分散樹脂を用いたフレキシブル圧力・曲げセンサの基礎検討

    高橋拓海, 富田亮, 安部隆, 鳴海敬倫, 寒川雅之

    電気学会全国大会講演論文集(CD-ROM)2019   ROMBUNNO.3‐164   2019年3月

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  • 大学1・2年次文理混合クラスにおけるプログラミング学修

    熊野英和, 鳴海敬倫

    応用物理学会春季学術講演会講演予稿集(CD-ROM)66th   ROMBUNNO.11p‐PA7‐15   2019年2月

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  • 液中に分散したゲルの縮小管内流れにおける通過特性に対するゲル物性の影響

    野口敦稀, 鳴海敬倫, 佐藤大祐, 牛田晃臣

    レオロジー討論会講演要旨集65th   36‐37   2017年10月

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  • 簡易イオン交換装置により粘弾性を制御した高分子水溶液の急縮小流れにおける不安定挙動の検討

    滝田宗利, 牛田晃臣, 栂伸司, 鳴海敬倫, 佐藤大祐, 萱場龍一

    レオロジー討論会講演要旨集65th   110‐111   2017年10月

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  • 7-212 ものづくりにおける新入生指導のあり方(オーガナイズドセッション:学生の学習活動事例-IV)

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    工学教育研究講演会講演論文集2013 ( 0 ) 400 - 401   2013年

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    記述言語:日本語   出版者・発行元:公益社団法人 日本工学教育協会  

    CiNii Article

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  • 7・6 複雑流体(7.流体工学,<特集>機械工学年鑑)

    鳴海 敬倫, 高橋 勉

    日本機械学会誌116 ( 1137 ) 536 - 537   2013年

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    記述言語:日本語   出版者・発行元:一般社団法人 日本機械学会  

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  • 複雑流体の構造変化と流動性に関する研究(受賞論文要約)

    鳴海 敬倫, Narumi Takatsune

    新潟大学工学部研究報告60   1 - 1   2011年3月

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    記述言語:日本語   出版者・発行元:新潟大学工学部  

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  • スリット出口付近における界面活性剤水溶液の流動複屈折挙動

    日本レオロジ-学会誌31, 99-106   2003年

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  • Birefringence of Aqueous Surfactant Solution in the Vicinity of a Slit Exit

    Journal of the Society of Rheology, Japan31,99-104   2003年

     詳細を見る

  • A Simple Methode for Measuring Elastic Stresses by Jet Thrust and Some Characteristics of Tube Flows

    Jornal of the Society of Rheology, Japan31, 243-252   2003年

  • A Simple Methode for Measuring Elastic Stresses by Jet Thrust and Some Characteristics of Tube Flows

    日本レオロジ-学会誌31, 243-252   2003年

  • 微小領域における複雑流体の可視化

    可視化情報学会誌22 ( 84 ) 32 - 37   2002年

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  • Visualization of complex fluids in minute flow fields

    Jornalization of complex fluids in minute flow fields22 ( 87 ) 32 - 37   2002年

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  • Study of the Flow of Non-Newtonian Fluids in the Inside of Slot Die(1st Repot, Analysis with Power Law Model)

    Trans. Jpn. Soc. Mech. Eng67 ( 661 ) 2174 - 2179   2001年

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  • Converging and Diverging Flow of Electrorheological Fluid in Minute Channels

    Proc. 7th International Conference on Electro-Rheological Fluids and Magneto-Rheological Suspensions   180 - 187   2000年

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  • Transient Behavior of Concentrated Suspensions after a Stepwise Change in Shear Direction

    Proc. 13th Int. Congr. on Rheology4   193 - 195   2000年

     詳細を見る

  • Converging and Diverging Flow of Electrorheological Fluid in Minute Channels

    Proc. 7th International Conference on Electro-Rheological Fluids and Magneto-Rheological Suspensions   180 - 187   2000年

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  • Transient Behavior of Concentrated Suspensions after a Stepwise Change in Shear Direction

    Proc. 13th Int. Congr. on Rheology4   193 - 195   2000年

     詳細を見る

  • Rheological Characteristics of Liquid Crystals in Narrow Gaps under Electric Field.

    Proc. 8th Australian National Conference on Rheology   169 - 172   1998年

     詳細を見る

  • Rheological Characteristics of Liquid Crystals in Narrow Gaps under Electric Field.

    Proc. 8th Australian National Conference on Rheology   169 - 172   1998年

     詳細を見る

  • 希薄高分子溶液の小オリフィスを通る流れと伸張応力の測定法に関する研究

    日本レオロジー学会誌26 ( 1 ) 21 - 26   1998年

  • Time-Frequency Characteristics of Pressure Fluctuation in Drag Reducing Pipe Flows

    Journal of the Society of Rheology, Japan26 ( 1 ) 7 - 14   1998年

  • Study of the Flow of Dilute Polymer Solution through a Small Oriffice and of the Measurement of Elon gational Stress

    Journal of the Society of Rheology, Japan26 ( 1 ) 21 - 26   1998年

  • 円管内抗力減少流れにおける圧力変動の時間・周波数特性

    日本レオロジー学会誌26 ( 1 ) 7 - 14   1998年

  • Studies on the Flow of Polymer Solutions and Liquid Crystalline Polymer Solutions from the Viewpoint of Fluid Engineering

    Journal of the Society of Rheology, Japan26 ( 4 ) 215 - 221   1998年

  • Electrorheological Effect of Liquid Crystals in Narrow Gaps.

    Proc. JSME ICFE '971   497 - 500   1997年

     詳細を見る

  • Transient Behavior of Liquid Crystalline Polymer Solution in Couette Flow with a Stepwise Change of Shear Stress

    Proc. PRCR2   205 - 206   1997年

     詳細を見る

  • Transient Behavior of Liquid Crystalline Polymer Solution in Couette Flow with a Stepwise Change of Shear Stress

    Proc. PRCR2   205 - 206   1997年

     詳細を見る

  • Electrorheological Effect of Liquid Crystals in Narrow Gaps.

    Proc. JSME ICFE '971   497 - 500   1997年

     詳細を見る

  • Flow Characteristics with Electrohydrodynamic Instability of Liquid Crystal in 2-Dimensional Minute Channels

    Proceedings of the 73rd JSME Spring Annual Meeting ((]G0003[)) ( 96-1 ) 225 - 226   1996年

     詳細を見る

  • Squeezing Flow of Liquid Crystalline Polymer Solution after Pre-shear Deformation

    XIXth Int. Congr. of Theoretical and Applied Mechanics   449   1996年

     詳細を見る

  • Flow Characteristics with Electrohydrodynamic Instability of Liquid Crystal in 2-Dimensional Minute Channels

    Proceedings of the 73rd JSME Spring Annual Meeting ((]G0003[)) ( 96-1 ) 225 - 226   1996年

     詳細を見る

  • Radial flow of liquid crystalline polymer solutions between two parallel circular plates

    T Narumi, S Itagaki, T Hasegawa

    XIITH INTERNATIONAL CONGRESS ON RHEOLOGY, PROCEEDINGS   151 - 152   1996年

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    記述言語:英語   出版者・発行元:UNIV LAVAL, DEPT MECH ENGN  

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  • Squeezing Flow of Liquid Crystalline Polymer Solution after Pre-shear Deformation

    XIXth Int. Congr. of Theoretical and Applied Mechanics   449   1996年

     詳細を見る

  • 希薄高分子溶液の円管内流れにおける摩擦損失と圧力変動特性

    方 義, 長谷川 富市, 渡辺 博, 鳴海 敬倫

    日本機械学会論文集,B編62 ( 598 ) 2151 - 2155   1996年

  • Radial flow of liquid crystalline polymer solutions between two parallel circular plates

    T Narumi, S Itagaki, T Hasegawa

    XIITH INTERNATIONAL CONGRESS ON RHEOLOGY, PROCEEDINGS   151 - 152   1996年

     詳細を見る

    記述言語:英語   出版者・発行元:UNIV LAVAL, DEPT MECH ENGN  

    Web of Science

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  • Drag Reduction and Pressure Fluctuation of Dilute Polymer Solutions in Pipe Flow.

    Trans. Jpn. Soc. Mech. Eng. , B62 ( 598 ) 2151 - 2155   1996年

     詳細を見る

  • 壁面近傍の微小円柱を過ぎる粘弾世流体の流れによる抗力と揚力

    渡辺 博, 長谷川 富市, 鳴海 敬倫, 玉野 健

    日本機械学会論文集,B編61 ( 582 ) 393 - 398   1995年

  • Drag and Lift Induced by the Flow of Viscoelastic Fluids Past a Minute Cylinder near a wall

    Hiroshi Watanabe, Tomiichi Hasegawa, Takatsune Narumi, Ken Tamano

    Trans. Jpn. Soc. Mech. Eng.61 ( 582 ) 393 - 398   1995年

     詳細を見る

  • SQUEEZE FILM FLOW OF VISCOELASTIC FLUID

    T NARUMI

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS39 ( 9 ) 768 - 773   1994年

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    記述言語:日本語   出版者・発行元:JAPAN SOC TRIBOLOGISTS  

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  • Normal Forces Generated in the Flow of Viscoelastic Fluids between Two Rollers Rotating at Relatively Different Speeds

    Journal of the Society of Rheology, Japan22 ( 2 ) 68 - 74   1994年

  • Stress Development caused by Stepwise Increase or Decrease of Boundary Velocity in Couette Flows

    Proceedings of the Pacific Conference on Rheology   102 - 103   1994年

     詳細を見る

  • 相対的に回転する2ロール間の粘弾性流体により生じる反発力

    日本レオロジー学会誌22 ( 2 ) 68 - 74   1994年

  • 粘弾性流体のスクイーズ膜特性

    トライボロジスト39 ( 9 ) 768 - 773   1994年

     詳細を見る

  • Stress Development caused by Stepwise Increase or Decrease of Boundary Velocity in Couette Flows

    Proceedings of the Pacific Conference on Rheology   102 - 103   1994年

     詳細を見る

  • 相対的に回転する2ロール間の流体により生じる力に関する研究

    関野 龍男, 長谷川 富市, 鳴海 敬倫

    日本機械学会論文集,B編59 ( 564 ) 2484 - 2488   1993年

  • Study of Normal Foces Generated in the Flow between Two Rolls Rotating at Relatively Different Speeds

    Trans. Jpn. Soc. Mech. Eng.59 ( 564 ) 144 - 148   1993年

     詳細を見る

  • Shear Stress Development caused by Stepwise Increase or Decrease of Shear Rate in Couette Flows

    Proceedings of PPS meeting   173 - 174   1993年

     詳細を見る

  • Shear Stress Development caused by Stepwise Increase or Decrease of Shear Rate in Couette Flows

    Proceedings of PPS meeting   173 - 174   1993年

     詳細を見る

  • Squeezing Flow Successively Generated in the Normal and Reverse Directions in Polymer Solutions(1st Report, Experiment on Transmitting Forces)

    Trans. Jpn. Soc. Mech. Eng.58 ( 546 ) 441 - 448   1992年

     詳細を見る

  • Squeezing Flow Successively Generated in the Normal and Reverse Directions in Polymer Solutions(2nd Report, Analysys of Transmitting Forces)

    Trans. Jpn. Soc. Mech. Eng.58 ( 546 ) 449 - 456   1992年

     詳細を見る

  • 高分子溶液の往復スクイーズ流れに関する研究(第1報,伝達荷重についての実験)

    鳴海敬倫, 八木敏之, 長谷川富市, 山根隆一郎

    日本機械学会論文集,B編58 ( 546 ) 441 - 448   1992年

  • 高分子溶液の往復スクイーズ流れに関する研究(第2報,伝達荷重についての解析)

    鳴海敬倫, 八木敏之, 長谷川富市, 山根隆一郎

    日本機械学会論文集,B編58 ( 546 ) 449 - 456   1992年

  • A Proposal on the Elongational Flow Characteristic of Dilute Polymer Solutions Flowing into Small Apertures

    Tomiichi HASEGAWA, Takatsune NARUMI

    Trans. Jpn. Soc. Mech. Eng.57 ( 534 ) 464 - 469   1991年

     詳細を見る

  • 希薄高分子溶液の小孔流入時にみられる伸張流的特性に関する一提案

    長谷川 富市, 鳴海 敬倫

    日本機械学会論文集,B編57 ( 534 ) 464 - 469   1991年

  • Experiments on Reverse Squeezing Flow of Dilute Polymer Solutions(Fluids with Newtonian Viscosity)

    JSME Int. J.33 ( 2 ) 193 - 199   1990年

  • Measurement of Elasticities of very Dilute Polymer Solutions in Shear and Elongational Flows.

    Tomiichi HASEGAWA, Hidetoshi SAITOH, Kazuo ISHIZUKA, Hitoshi NAKAMURA, Takatsune NARUMI

    Trans. Jpn. Soc. Mech. Eng.56 ( 523 ) 675 - 683   1990年

     詳細を見る

  • せん断流と伸張流における非常に希薄な高分子溶液の弾性の測定

    長谷川 富市, 斎藤 秀俊, 石塚 一男, 中村 仁志, 鳴海 敬倫

    日本機械学会論文集,B編56 ( 523 ) 675 - 683   1990年

  • Experiments on Reverse Squeezing Flow of Dilute Polymer Solutions(Fluids with Newtonian Viscosity)

    JSME Int. J.33 ( 2 ) 193 - 199   1990年

  • 希薄高分子溶液の逆スクイズ流れに関する実験的研究(第1報,ニュートン粘性を示す流体)

    鳴海 敬倫, 細川 喜弘, 長谷川 富市

    日本機械学会論文集,B編55 ( 512 ) 1039 - 1044   1989年

  • Experiments on the Reverse Squeezing Flow Dilute Polymer Solutions(Fluids with Newtonian Viscosity)

    Takatsune NARUMI, Yoshihiro HOSOKAWA, Tomiichi HASEGAWA

    Trans. Jpn. Soc. Mech. Eng.55 ( 512 ) 1039 - 1044   1989年

     詳細を見る

  • Experimental Estimation of Elongational Stresses of Dilute Polymer Solutions and a Related Examination of Some Constitutive Equations

    J. Non-Newtonian Fluid Mech.27,133-151   1988年

  • On the Measurement of Small Particle Size by Sedimentation

    Trans. Jpn. Mech. Eng.54 ( 497 ) 119 - 124   1988年

     詳細を見る

  • 沈降法による微小粒子の粒径測定について

    長谷川富市, 塩原春樹, 鳴海敬倫

    日本機械学会論文集,B編54 ( 497 ) 119 - 124   1988年

  • Experimental Estimation of Elongational Stresses of Dilute Polymer Solutions and a Related Examination of Some Constitutive Equations

    J. Non-Newtonian Fluid Mech.27,133-151   1988年

  • 小孔を通過する流れに関する研究(第2報,速度場に関する実験)

    福冨 清, 長谷川 富市, 中野 裕二, 鳴海 敬倫

    日本機械学会論文集B編53 ( 496 ) 3516 - 3521   1987年

  • 洗液の交番流による洗浄法の開発

    油化学36 ( 6 ) 418 - 425   1987年

     詳細を見る

  • Assessment of Elongational Stress of Dilute polymer Solutions and a Related Examination of Some Constitutive Equations

    Tomiichi HASEGAWA, Kiyoshi FUKUTOMI, Takatsune MARUMI

    Trans. Jpn. Soc. Mech. Eng.53 ( 492 ) 2295 - 2302   1987年

     詳細を見る

  • Development of a Washing Method Utilizing Pulsating Flows

    J. Jpn. Oil Chem. Soc.36 ( 6 ) 418 - 425   1987年

     詳細を見る

  • 小孔を通過する流れに関する研究(第1報,余剰圧力損失に関する実験)

    長谷川 富市, 福冨 清, 鳴海 敬倫

    日本機械学会論文集,B編53 ( 496 ) 3510 - 3515   1987年

  • A Study of a Flow trough Small Aperture(2nd Report, Experiments on the Velocity Field)

    Kiyoshi FUKUTOMI, Tomiichi HASEGAWA, Yuji NAKANO, Takatsune NARUMI

    Trans. Jpn. Soc. Mech. Eng.53 ( 496 ) 3516 - 3521   1987年

     詳細を見る

  • 希薄高分子溶液の伸張応力の算定と構成方程式の検討

    長谷川 富市, 福冨 清, 鳴海 敬倫

    日本機械学会論文集,B編53 ( 492 ) 2295 - 2302   1987年

  • A Study of a Flow through Small Apertures(1st Report, Experiments on the Excess Pressure Drop)

    Tomiichi HASEGAWA, Kiyoshi FUKUTOMI, Takatsune NARUMI

    Trans. Jpn. Soc. Mech. Eng.53 ( 496 ) 3510 - 3515   1987年

     詳細を見る

  • Experimental Study on the Squeezing Flow of Viscoelastic Fluids(1st Report)

    Bull. JSME29 ( 257 ) 3731 - 3736   1986年

     詳細を見る

  • Experimental Study on the Squeezing Flow of Viscoelastic Fluids(1st Report)

    Bull. JSME29 ( 257 ) 3731 - 3736   1986年

     詳細を見る

  • Experimental Study on the Squeezing Flow of Viscoelastic Fluids(1st Report, The Effect on Liquid Properties on the Flow Between a Spherical Surface and a Flat Plate)

    Takatsune NARUMI, Tomiichi HASEGAWA

    Trans. Jpn. Soc. Mech. Eng.52 ( 475 ) 1207 - 1214   1986年

▶ 全件表示

産業財産権

Works(作品等)

  • カーボンナノチューブ分散系の流動誘起構造に関する研究

    2010年
    -
    現在

     詳細を見る

  • Visualization of Flow Behavior of Oil injected in screw compressor

    2000年

     詳細を見る

  • スクリューコンプレッサー内のオイルの流動状態の観察

    2000年

     詳細を見る

  • 濃厚系粒子サスペンションの流動構造化に関する研究

    1999年
    -
    現在

     詳細を見る

  • Research on Flow Induced Micro-Structure of Concentrated Suspensions

    1999年

     詳細を見る

  • マイクロ流れにおける複雑流体の挙動

    鳴海 敬倫

    1998年
    -
    現在

     詳細を見る

  • 液晶の電気粘性効果に関する研究

    1998年
    -
    2015年

     詳細を見る

  • Research on Electro-rheological Effect of Liquid Crystal.

    1998年
    -
    2000年

     詳細を見る

  • 粘弾性流体の流動特性の解明

    1981年
    -
    現在

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▶ 全件表示

受賞

  • 学会賞

    2010年5月   日本レオロジー学会  

    鳴海 敬倫

     詳細を見る

  • 日本レオロジー学会 有功賞

    1998年5月  

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    受賞国:日本国

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共同研究・競争的資金等の研究

  • マイクロ・ナノサイズの流れにおける複雑流体の流動挙動の解明

    2014年 - 2016年

    挑戦的萌芽研究 

    鳴海敬倫

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    担当区分:研究代表者  資金種別:競争的資金

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  • 液晶を用いた変形強度分布を調整・再生かつ可視化できる知能化粘弾性組織の試験的開発

    2011年 - 2012年

    挑戦的萌芽研究 

    鳴海 敬倫

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    担当区分:研究代表者  資金種別:競争的資金

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  • マイクロ流れでの水系複雑流体の構造制御による機能性発現と医療系μ流動制御への展開

    2009年 - 2011年

    基盤研究(B) 

    鳴海 敬倫

      詳細を見る

    担当区分:研究代表者  資金種別:競争的資金

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  • 電場を用いた液晶のビンガム特性の制御によるマイクロ機能性構造の創製とその流体応用

    2007年 - 2008年

    基盤研究(C) 

    鳴海 敬倫

      詳細を見る

    担当区分:研究代表者  資金種別:競争的資金

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  • DNA高分子分散系の流動特性の解明

    2005年 - 2006年

    基盤研究(B) 

    長谷川富市

      詳細を見る

    資金種別:競争的資金

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  • 液晶のER効果を応用した知能化マイクロ冷却システムの開発

    2005年 - 2006年

    基盤研究(C) 

    鳴海 敬倫

      詳細を見る

    担当区分:研究代表者  資金種別:競争的資金

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  • 液晶による構造再生・創生機能を有する知能化粘弾性組織の試験的開発

    2003年 - 2004年

    萌芽研究 

    鳴海 敬倫

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    担当区分:研究代表者  資金種別:競争的資金

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  • 流動分散構造の異方性により発現するサスペンション・コロイド系の機能性の利用

    2000年 - 2001年

    基盤研究(C) 

    鳴海 敬倫

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    担当区分:研究代表者  資金種別:競争的資金

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  • 液晶と分散系ER流体を用いた複合機能を有するマイクロ流体制御デバイスの開発

    1998年 - 2000年

    基盤研究(B) 

    長谷川富市

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    資金種別:競争的資金

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  • Flow of Suspensions

    1998年

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    資金種別:競争的資金

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  • 流動履歴効果を利用した多段変形による液晶高分子の配向制御

    1997年 - 1998年

    基盤研究(C) 

    鳴海 敬倫

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    担当区分:研究代表者  資金種別:競争的資金

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  • プレシア-による液晶高分子の塗布・成形流れにおける配向構造の制御

    1996年

    基盤研究(C) 

    鳴海 敬倫

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    担当区分:研究代表者  資金種別:競争的資金

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  • 均一系の機能性流体を利用したマイクロ流体システムの開発

    1995年 - 1996年

    基盤研究(A) 

    鳴海 敬倫

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    担当区分:研究代表者  資金種別:競争的資金

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  • Flow of Liquid Crystals or Liquid Crystalline Polymers.

    1995年

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    資金種別:競争的資金

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  • 微小すきまにおける機能性流体のスクイーズ流れ

    1994年 - 1995年

    一般研究(C) 

    鳴海 敬倫

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    担当区分:研究代表者  資金種別:競争的資金

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  • 関節液に含まれる高分子の生体関節内の弾性流体潤滑に及ぼす影響

    1992年

    奨励研究(A) 

    鳴海 敬倫

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    担当区分:研究代表者  資金種別:競争的資金

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  • Study on the Squeezing Flow of Non-Newtonian Fluid

    1985年

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    資金種別:競争的資金

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  • Development of Micro ER Device

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    資金種別:競争的資金

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