Research activity information

• Oct. 2021 化学工学会システム・情報・シミュレーション（SIS）部会, 技術賞, 連続式振動流バッフル反応器による晶析プロセスの強化

  堀江孝史、谷川 仁、間中敦史、菰田悦之、大村直人

  共同研究・競争的資金等の業績IDIRI


• Mar. 2019 The Society of Chemical Engineers, Japan, Fluid and Particle Processing Division, The Society of Chemical Engineers, Japan, Fluid and Particle Processing Division, Frontier Award, Flow Dynamics in Taylor-Couette Flow Reactor with Axial Distribution of Temperature

  増田 勇人, 吉田 早穂, HORIE TAKAFUMI, OHMURA NAOTO, 下山田 真

  Japan society

  共同研究・競争的資金等の業績IDIRI


• Mar. 2016 Society of Chemical Engineers, Japan, Best Reviewer Award 2015, Review for Kagaku Kogaku Ronbunshu and Journal of Chemical Engineering of Japan

  OHMURA NAOTO

  化学工学論文集および、Journal of Chemical Engineering of Japanの論文審査に貢献したため

  Official journal


• Mar. 2015 Society of Chemical Engineers, Japan, Best Reviewer Award 2014, Review for Kagaku Kogaku Ronbunshu and Journal of Chemical Engineering of Japan

  OHMURA NAOTO

  化学工学論文集および、Journal of Chemical Engineering of Japanの論文審査に貢献したため

  Official journal


• Nov. 2014 Elsevier, Chemical Engineering & Processing: Process Intensification Outstanding Contribution in Reviewing, In recognition of the contributions made to the quality of the journal

  OHMURA NAOTO

  Official journal


• Mar. 2014 化学工学会, 化学工学会 粒子・流体プロセス部会 動画賞（研究部門）, 撹拌槽の層流混合場における粒子分散挙動

  TANAKA HISATO, NABATA MAYUKO, HORIE TAKAFUMI, OHMURA NAOTO

  Others


• Mar. 2002 化学工学会, 化学工学論文集 優秀論文賞, テイラー渦流反応装置における孤立混合領域

  MAKINO Tsukasa, KAISE Takuya, SASAKI Kenji, OHMURA Naoto, KATAOKA Kunio

• Flow and mixing characteristics in a droplet on a vibrating plate

  Yuki Morita, Ippo Ota, Yoshiyuki Komoda, Naoto Ohmura

  Aug. 2025, Journal of the Taiwan Institute of Chemical Engineers

  Scientific journal


• CFD Analysis of Laminar Mixing Mechanism and Performance in an Oscillatory Baffled Reactor

  Ryosuke Murotani, Takafumi Horie, Satoko Fujioka, Yoshiyuki Komoda, Naoto Ohmura, Hayato Masuda, Erika Okita, Masahiro Yasuda

  Aug. 2024, Chemical Engineering & Technology

  Scientific journal


• Estimation of mean shear rate in a vessel of a planetary centrifugal mixer based on the heat balance equation

  Yoshiyuki Komoda, Hajime Utsunomiya, Yuki Nakamura, Fumihiko Takaoka, Naoto Ohmura

  Feb. 2024, Chemical Engineering Research and Design

  Scientific journal


• Quantitative evaluation of adsorption behavior of carboxymethylcellulose on carbon nanotubes by time-domain NMR with the aim of obtaining stable dispersions

  Yoshiyuki Komoda, Mayu Ueyama, Ayano Sofue, Akiyoshi Nishikawa, Naoto Ohmura

  Feb. 2024, Colloids and Surfaces A: Physicochemical and Engineering Aspects

  Scientific journal


• Numerical Simulation during Development of Taylor−Couette Flow with Shear-thinning Fluids

  Hayato Masuda, Hiroyuki Iyota, Naoto Ohmura

  Jun. 2023, Chemical Engineering Transactions, 100, 307 - 312

  [Refereed]


• Process intensification of synthesis of metal organic framework particles assisted by ultrasound irradiation

  Yu Ogura, Keita Taniya, Takafumi Horie, Kuo-Lun Tung, Satoru Nishiyama, Yoshiyuki Komoda, Naoto Ohmura

  Elsevier BV, Jun. 2023, Ultrasonics Sonochemistry, 96, 106443 - 106443, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Thermo-fluid dynamics and synergistic enhancement of heat transfer by interaction between Taylor-Couette flow and heat convection

  Hayato Masuda, Kanta Nakagawa, Hiroyuki Iyota, Steven Wang, Naoto Ohmura

  May 2023, PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 381(2246) (2246), English

  Scientific journal


• Flow and mixing characteristics of gas-liquid slug flow in a continuous Taylor-Couette flow reactor with narrow gap width

  Keigo Shimizu, Kairi Kato, Tomoyuki Kobayashi, Yoshiyuki Komoda, Naoto Ohmura

  Elsevier BV, Jan. 2023, Chemical Engineering and Processing - Process Intensification, 183, 109226 - 109226, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Vortex Dynamics in Complex Fluids

  Naoto Ohmura, Hayato Masuda, Steven Wang

  The present chapter provides an overview of vortex dynamics in complex fluids by taking examples of Taylor vortex flow. As complex fluids, non-Newtonian fluid is taken up. The effects of these complex fluids on the dynamic behavior of vortex flow fields are discussed. When a non-Newtonian shear flow is used in Taylor vortex flow, an anomalous flow instability is observed, which also affects heat and mass transfer characteristics. Hence, the effect of shear-thinning on vortex dynamics including heat transfer is mainly referred. This chapter also refers to the concept of new vortex dynamics for chemical process intensification technologies that apply these unique vortex dynamics in complex fluids in Conclusions.

  IntechOpen, Sep. 2022, Vortex Dynamics - From Physical to Mathematical Aspects

  [Refereed]

  In book


• Preparation of ZIF-8-coated silica hard-shell microcapsule by semi-batch operation

  Shuei Kawada, Takumu Otsubo, Takafumi Horie, Yoshiyuki Komoda, Naoto Ohmura, Hitoshi Asano, Ruri Hidema, Hiroshi Suzuki, Keita Taniya, Yuichi Ichihashi, Satoru Nishiyama

  Sep. 2022, CrystEngComm, 24(42) (42), 7378 - 7386

  [Refereed]

  Scientific journal


• Stress development of latex coatings in a convection drying with the accumulation and deformation of polymer particles

  Hiroaki Tanaka, Yoshiyuki Komoda, Takafumi Horie, Naoto Ohmura

  Last, Sep. 2022, Progress in Organic Coatings, 170

  [Refereed]

  Scientific journal


• Reaction rate enhancement of three‐phase hydrogenation using the Taylor flow reactor

  Takafumi Horie, Kenta Hirai, Norihisa Kumagai, Keita Taniya, Yuichi Ichihashi, Naoto Ohmura, Keigo Matsuda, Hideyuki Matsumoto, Makoto Sakurai, Yoshihide Watabe

  Abstract A gas–liquid–solid three‐phase reaction was conducted in a Taylor flow reactor to improve the apparent reaction rate by enhancing the mass transfer rate of the gas component to the surface of the solid catalyst through the liquid. Hydrogenation of α‐methyl styrene (AMS) was the model reaction. The reactor was an aluminum tube with a length of 300 mm and an inner diameter of 4 mm. A thin alumina layer was formed on the inner wall and palladium was used as the catalyst. Hydrogen and AMS were introduced into a T‐joint installed at the upper stream of the reactor to form a gas–liquid Taylor flow. The AMS conversion obtained using the Taylor flow was higher than that obtained without the flow. To examine the effect of the hydrogen absorption promotion by the circulating flow in the AMS slug, the total flow rate of the reactants was varied whereas the length of the gas and liquid slugs was maintained. Although the absorption increased owing to the faster surface renewal, only a slight improvement was observed. Conversely, when the total flow rate was fixed and the ratio of the gas slug length to the liquid slug length was increased, the apparent reaction rate improved significantly. These results indicate that diffusion in the thin liquid film directly toward the solid catalyst on the reactor wall was dominant for enhancing the reaction rate.

  Wiley, Mar. 2022, Journal of Advanced Manufacturing and Processing, 4(3) (3)

  Scientific journal


• Topology and dynamics of streakline on the mixing boundary of two-dimensional chaotic flow induced by a rotationally reciprocating anchor impeller

  Haruna Hirose, Yoshiyuki Komoda, Takafumi Horie, Naoto Ohmura

  Last, Feb. 2022, Journal of the Taiwan Institute of Chemical Engineers, 131

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Friction Factor Distribution at the Side Wall of a Turbulent Agitated Vessel with Baffles Using a MAXBLEND Impeller

  Yusuke Ochi, Katsuhide Takenaka, Yoshiyuki Komoda, Naoto Ohmura

  Last, Jan. 2022, Industrial and Engineering Chemistry Research, 61(3) (3), 1514 - 1522

  [Refereed]

  Scientific journal


• Motion analysis of green tea stirring in Japanese tea ceremony

  Sudo Ayumi, Shirasugi Naoko Kataoka, Honda Sachiko, Gion Keiko, Masuda Hayato, Ohmura Naoto

  【目的】茶道における抹茶の点て方やその仕上がりには、熟練者と⾮熟練者の間に⽬に⾒えてわかる差異が存在し、熟練者は暗黙知、すなわち⼈間が無意識のうちに⻑年の経験や勘などから得た、簡単には⾔語化できない知識をもつ。本研究では、茶道流派の一つである裏千家のきめ細かい抹茶の泡立ち方に着目し、撹拌動作を分析することで、化学工学の視点から撹拌に有効な動作の抽出を試みた。 【方法】抹茶2 gを入れた内径10.5 cmの茶碗に80℃の湯70 mLを注ぎ、完全形、内穂のみ、外穂のみの3種類の茶筌を用い、熟練者（3名）と⾮熟練者（3名）に抹茶を撹拌させた。撹拌動作による泡⽴ちへの影響を調べるために被験者の肘、⼿⾸、中指の第⼆関節の3点に印をつけて、正面から動画撮影し、Dipp-Motion V（DITECT 社製 Ver.1.2.6）を用いて動作解析を⾏った。泡立ち評価は、茶碗の真上から撮った画像をImage J（v.1.53o）を用いてモノクロ二値化し、黒の部分の面積を比較し行った。 【結果・考察】熟練者は3種類の茶筌を用いて撹拌した場合、いずれにおいても泡のきめ細かさや泡立ち具合のばらつきが少なかった。一方、非熟練者は茶筌の違いによる泡立ちに大きなばらつきがみられた。動作解析の結果、熟練者は肘の変位が⾮熟練者よりも大幅に小さく、肘を軸とした撹拌を行うことがわかった。さらに、手首と中指の変動が同期し、熟練者に見られる肘の変動が逆位相の場合、細かな泡立ちとなったが、非熟練者に見られる肘の変動が手首と中指の変動と1/4周期の位相差がある場合、荒い泡立ちとなった。

  The Japan Society of Cookery Science, 2022, Abstracts of the Annual Meeting of the Japan Society of Cookery Science, 33, 61, Japanese


• Drying rate of latex coating affected by the deformability of resin particles in convection drying

  Hiroaki Tanaka, Yoshiyuki Komoda, Takafumi Horie, Hironobu Imakoma, Naoto Ohmura

  Last, Jan. 2022, European Physical Journal E, 45(1) (1)

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Global Convection Characteristics of Conical Taylor‐Couette Flow with Shear‐Thinning Fluids

  Hayato Masuda, Hiroyuki Iyota, Naoto Ohmura

  Last, Wiley, Nov. 2021, Chemical Engineering & Technology, 44(11) (11), 2049 - 2055, English

  [Refereed]

  Scientific journal


• Effect of Baffle Clearance on Scale Deposition in an Agitated Vessel

  Eri Sato, Yusuke Ochi, Hiroo Horiguchi, Katsuhide Takenaka, Jie Wu, Rajarathinam Parthasarathy, Yoshiyuki Komoda, Naoto Ohmura

  Last, American Chemical Society (ACS), Sep. 2021, ACS Omega, 6(37) (37), 24070 - 24074, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Representative shear rate for particle agglomeration in a mixing tank

  Yusuke Ochi, Ziqi Cai, Takafumi Horie, Yoshiyuki Komoda, Kuo Lun Tung, Naoto Ohmura

  Last, Jul. 2021, Chemical Engineering Research and Design, 171, 73 - 79

  [Refereed]

  Scientific journal


• Forced motion of a single particle in micron-sized particle dispersion

  Sayu Goto, Nami Furukawa, Yoshiyuki Komoda, Kosuke Suzuki, Takafumi Horie, Naoto Ohmura

  Last, May 2021, Journal of the Society of Powder Technology, Japan, 58(3) (3), 138 - 146

  [Refereed]

  Scientific journal


• Enzymatic starch hydrolysis performance of Taylor-Couette flow reactor with ribbed inner cylinder

  Masahiro Matsumoto, Hayato Masuda, Robert Hubacz, Takafumi Horie, Hiroyuki Iyota, Makoto Shimoyamada, Naoto Ohmura

  Last, Elsevier {BV}, Feb. 2021, Chemical Engineering Science, 231, 116270 - 116270

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Gas Absorption Enhancement of Slug Flow in the Presence of Non-Porous Silica Fine Particles

  Yuuki Iwamura, Takafumi Horie, Yoshihide Watabe, Hayato Masuda, Steven Wang, Kenta Hirai, Norihisa Kumagai, Keita Taniya, Yuichi Ichihashi, Yoshiyuki Komoda, Naoto Ohmura

  Last, Aug. 2020, Journal of Chemical Engineering of Japan, 53(8) (8), 409 - 413

  [Refereed]

  Scientific journal


• Experimental study on mass transfer in a packed distillation column

  Goro Nishimura, Kunio Kataoka, Hideo Noda, Hiroshi Yamaji, Naoto Ohmura

  Last, Aug. 2020, Journal of Chemical Engineering of Japan, 53(8) (8), 402 - 408

  [Refereed]

  Scientific journal


• Impacts of the Surfactant Concentration on the Sedimentation Characteristics of Silica Hard-Shell Microcapsules Containing Phase Change Materials

  Sohei Usa, Ruri Hidema, Yoshiyuki Komoda, Takafumi Horie, Keita Taniya, Yuichi Ichihashi, Naoto Ohmura, Satoru Nishiyama, Hitoshi Asano, Hiroshi Suzuki

  Society of Chemical Engineers, Japan, Aug. 2020, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 53(8) (8), 431 - 437

  [Refereed]

  Scientific journal


• Computer-aided Semi-empirical Model of Interphase Mass and Enthalpy Transfer in a Packed Column Distillation Process

  Goro Nishimura, Kunio Kataoka, Hideo Noda, Naoto Ohmura

  Last, Jan. 2020, Computer Aided Chemical Engineering, 48, 1 - 6

  [Refereed]

  In book


• Flow and sedimentation characteristics of silica hard-shell microcapsule slurries treated with additives

  Hiroshi Suzuki, Ruri Hidema, Sohei Usa, Takafumi Horie, Yoshiyuki Komoda, Naoto Ohmura, Keita Taniya, Yuichi Ichihashi, Satoru Nishiyama, Hitoshi Asano

  Oct. 2019, International Journal of Refrigeration, 106, 18 - 23

  [Refereed]

  Scientific journal


• Advances in Biological Liquid Crystals

  Jianguo Zhao, Utku Gulan, Takafumi Horie, Naoto Ohmura, Jun Han, Chao Yang, Jie Kong, Steven Wang, Ben Bin Xu

  May 2019, SMALL, 15(18) (18), 1900019, English

  [Refereed]

  Scientific journal


• Effect of geometrical configuration of reactor on a ZrP nano-dispersion process using ultrasonic irradiation

  Saki Fukunaga, Sayaka Higashi, Takafumi Horie, Hiroaki Sugiyama, Akihisa Kanda, Tong-Yang Hsu, Kuo-Lun Tung, Keita Taniya, Satoru Nishiyama, Naoto Ohmura

  Apr. 2019, Ultrasonics Sonochemistry, 52, 157 - 163, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• CFD analysis of effective human motion for whipping heavy cream by hand

  Kazuya Ikeda, Hayato Masuda, Naoko Shirasugi, Sachiko Honda, Takafumi Horie, Naoto Ohmura

  2019, Chemical Engineering Transactions, 75, 121 - 126

  [Refereed]

  Scientific journal


• Characteristics of a falling liquid film flow using periodic jetting flow

  Risa Kajitani, Tadahiro Mukaida, Kunio Kataoka, Naoto Ohmura

  2019, Chemical Engineering Transactions, 74, 991 - 996

  [Refereed]

  Scientific journal


• Effect of rheological properties of liquid foods on heat sterilization process in Taylor–Couette flow apparatus

  Hayato Masuda, Hubacz Robert, Naoto Ohmura, Makoto Shimoyamada

  2019, Chemical Engineering Transactions, 75, 31 - 36

  [Refereed]

  Scientific journal


• 神戸大学「志」講義 –新時代を切り拓く羅針盤を身につけるために

  TSURUTA HIROKI, GION KEIKO, OHMURA NAOTO, SAITO MASA-HIKO

  神戸大学大学教育推進機構, 2019, 大学教育研究, 27(27) (27), 103 - 112, Japanese

  [Refereed]

  Research institution


• Numerical Simulation of Sterilization Processes for Shear-Thinning Food in Taylor-Couette Flow Systems

  OHMURA NAOTO, Hayato Masuda, Robert Hubacz, Makoto Shimoyamada

  2019, Chemical Engineering & Technology, 42(4) (4), 859 - 866, English

  [Refereed]

  Scientific journal


• Heat transfer characteristics of Taylor vortex flow with shear-thinning

  MASUDA HAYATO, SHIMOYAMADA MAKOTO, OHMURA NAOTO

  2019, International Journal of Heat and Mass Transfer, 130, 274 - 281, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Effects of Fabrication Conditions on Silica Hard-Shell Microcapsules Containing Phase Change Materials

  WATANABE Ippei, FURUKAWA Nami, KURODA Naoki, HIDEMA Ruri, SUZUKI Hiroshi, KOMODA Yoshiyuki, HORIE Takafumi, ASANO Hitoshi, OHMURA Naoto

  Begellhouse, 2019, 16th International Heat Transfer Conference (IHTC-16), IHTC16, 4319 - 4325, English

  [Refereed]

  Scientific journal


• Intensification of Two Dimensional Laminar Mixing Using a Rotationally Reciprocating Anchor Impeller

  KOMODA Yoshiyuki, DATE Tomoya, HIDEMA Ruri, SUZUKI Hiroshi, OHMURA Naoto

  Nov. 2018, Proceedings of 6th International Workshop on Process Intensification (IWPI 2018), 2pages, English

  International conference proceedings


• Flow and Dispersion Characteristics of Silica Hard-Shell Microcapsule Slurries

  USA Sohei, HIDEMA Ruri, HORIE Takafumi, TANIYA Keita, KOMODA Yoshiyuki, ICHIHASHI Yuichi, OHMURA Naoto, NISHIYAMA Satoru, SUZUKI Hiroshi

  Nov. 2018, Proceedings of 6th International Workshop on Process Intensification (IWPI 2018), 2pages, English

  International conference proceedings


• Fabrication of Hard-Shell Microcapsules Containing Sodium Acetate Inorganix Hydrates

  SUZUKI Hiroshi, HIDEMA Ruri, WATANABE Ippei, KOMODA Yoshiyuki, HORIE Takafumi, OHMURA Naoto, ASANO Hitoshi

  Oct. 2018, Proceedings of The 29th International Symposium on Transport Phenomena (ISTP29), ISTP29 - 088, English

  [Refereed]

  International conference proceedings


• Laminar mixing using a rotationally reciprocating anchor impeller”, 16th European Conference on Mixing

  KOMODA Yoshiyuki, DATE Tomoya, HIDEMA Ruri, SUZUKI Hiroshi, OHMURA Naoto

  Sep. 2018, Proceedings of 16th European Conference on Mixing, English

  [Refereed]

  International conference proceedings


• Improvement of separation performance by fluid motion in the membrane module with a helical baffle

  Takaaki Akagi, Takafumi Horie, Hayato Masuda, Keigo Matsuda, Hideyuki Matsumoto, Naoto Ohmura, Yushi Hirata

  Elsevier B.V., Jun. 2018, Separation and Purification Technology, 198, 52 - 59, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Intensification of hollow fiber membrane cross-flow filtration by the combination of helical baffle and oscillatory flow

  Takafumi Horie, Saori Shiota, Takaaki Akagi, Naoto Ohmura, Steven Wang, Valentine Eze, Adam Harvey, Yushi Hirata

  Elsevier B.V., May 2018, Journal of Membrane Science, 554, 134 - 139, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• A Report on the Interactive Workshop with “Dialogue Tools for Innovation”

  GION KEIKO, MORI ICHIRO, OHMURA NAOTO, HIRAI MIDORI, TSURUTA HIROKI

  アクティブラーニングやプロジェクトベーストラーニング（PBL）が高等教育に取り入れられて久しい。特に、近年、卓越大学院大学事業、次世代アントレプレナー育成事業（EDGE-NEXT）など、ワークショップ形式を取り入れた講義を提供する機会が増加している。ここでは、「イノベーション対話ツール」を高等教育におけるワークショップ形式の講義の指南書として活用して実施したワークショップの事例を紹介する。本指南書は、産学連携によるイノベーションを目指した対話を推進するために、平成25年度に文部科学省が慶應義塾大学システムデザイン・マネジメント研究科に委託して作成されたものであるが、これを基にワークショップを設計し、ブレインストーミング、親和図法、バリューグラフを実施したところ、学生らに対して課題解決のプロセスにおける発想力並びに対話力の向上と気づきを提供することがで

  Institute for Promotion of Higher Education, Kobe University, Mar. 2018, Kobe Journal of Higher Education, 26(26) (26), 27 - 40, Japanese

  [Refereed]

  Research institution

  Link to Kobe Univ. Repository (Kernel)


• Development of an Education Program for Future Innovators

  TSURUTA HIROKI, GION KEIKO, OHMURA NAOTO

  現代は不確実性の高い社会と呼ばれ、複雑で唯一最適解がない課題が山積されている。さらに科学技術の急激な発展が生活・労働などのヒトが営む活動の環境を加速度的に変化させているのが現代社会の特徴である。このような不確実性の高い社会にこれから出て行く学生は、この社会を変革していく担い手となることが求められている。社会を変革するには、科学技術を基盤とした価値創造、人間を中心にした視点での価値創造による「イノベーション」を引き起こすことが求められる。その担い手が持つ能力は、優れた知識を融合して問題に対峙していける人材である。本論文では、１）現代社会の現状認識とイノベーションを実現する人材の育成の必要性を述べるとともに、２）産業界が求める人材イメージと神戸大学が輩出すべき人材が身につけるべき能力の定義、３）その能力を醸成するための現実社会の問題を題材にした「イノベー

  Institute for Promotion of Higher Education, Kobe University, Mar. 2018, Kobe Journal of Higher Education, 26(26) (26), 119 - 129, Japanese

  [Refereed]

  Research institution


• Flow dynamics in Taylor–Couette flow reactor with axial distribution of temperature

  Hayato Masuda, Saho Yoshida, Takafumi Horie, Naoto Ohmura, Makoto Shimoyamada

  Mar. 2018, AIChE Journal, 64(3) (3), 1075 - 1082, English

  [Refereed]

  Scientific journal


• Using motion analysis to evaluate techniques for whipping heavy cream by hand

  Maiko Hara, Hayato Masuda, Takafumi Horie, Sachiko Honda, Naoko Kataoka-Shirasugi, Naoto Ohmura

  Society of Chemical Engineers, Japan, 2018, Journal of Chemical Engineering of Japan, 51(2) (2), 180 - 184, English

  [Refereed]

  Scientific journal


• Mixing characteristics of submerged fungal fluid in a flexible stirred mixer system

  Narges Ghobadi, Chiaki Ogino, Tomohiro Ogawa, Naoto Ohmura

  Society of Chemical Engineers, Japan, 2018, Journal of Chemical Engineering of Japan, 51(2) (2), 143 - 151, English

  [Refereed]

  Scientific journal


• Intensification of mixing processes with complex fluids

  Naoto Ohmura, Hayato Masuda, Steven Wang

  2018, Journal of Chemical Engineering of Japan, 51(2) (2), 129 - 135, English

  [Refereed][Invited]

  Scientific journal


• Evaporative heat transfer characteristics of a novel continuous, multi-staged evaporator/distiller with unsteady falling liquid film flow

  Tadahiro Mukaida, Kunio Kataoka, Hiroshi Yamaji, Hideo Noda, Naoto Ohmura

  2018, Kagaku Kogaku Ronbunshu, 44(2) (2), 107 - 112, Japanese

  [Refereed]

  Scientific journal


• Dispersion and flow characteristics of hard-shell microcapsules with phase change materials

  H. Suzuki, I. Watanabe, R. Hidema, Y. Komoda, T. Horie, N. Ohmura, H. Asano

  International Institute of Refrigeration, 2018, Refrigeration Science and Technology, 2018-, 174 - 181, English

  [Refereed]

  International conference proceedings


• Preparation of a Photoresponsive Tracer to Evaluate the Performance of Dry-Type Powder Photoreactors

  Junichi Hirota, Taro Inoue, Toru Watanabe, Atsushi Okemoto, Takafumi Horie, Naoto Ohmura, Keita Taniya, Yuichi Ichihashi, Satoru Nishiyama

  Sep. 2017, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 50(9) (9), 710 - 715, English

  [Refereed]

  Scientific journal


• THERMAL TREATMENT OF STARCH SLURRY IN COUETTE-TAYLOR FLOW APPARATUS

  Robert Hubacz, Hayato Masuda, Takafumi Horie, Naoto Ohmura

  Sep. 2017, CHEMICAL AND PROCESS ENGINEERING-INZYNIERIA CHEMICZNA I PROCESOWA, 38(3) (3), 345 - 361, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Rate Enhancement of Three-phase Hydrogenation with a Taylor Flow Millireactor

  Takafumi Horie, Kenta Hirai, Norihisa Kumagai, Naoto Ohmura

  May 2017, Proceedings of 3rd International Symposium on Multiscale Multiphase Process Engineering (MMPE2017), English

  International conference proceedings


• Gas Absorption Enhancement of Taylor Flow Containing Non-porous Fine Particles

  Yuuki Iwamura, Kenta Hirai, Norihisa Kumagai, Takafumi Horie, Naoto Ohmura

  May 2017, Proceedings of 3rd International Symposium on Multiscale Multiphase Process Engineering (MMPE2017), English

  International conference proceedings


• Dynamic Behavior of Particle Aggregation Using a Stirred Vessel

  Hayato Masuda, Kazuto Tsuda, Keisuke Matsui, Takafumi Horie, Yoshiyuki Komoda, Naoto Ohmura

  May 2017, Proceedings of 3rd International Symposium on Multiscale Multiphase Process Engineering (MMPE2017), English

  International conference proceedings


• Process development of starch hydrolysis using mixing characteristics of Taylor vortices

  Hayato Masuda, Takafumi Horie, Robert Hubacz, Naoto Ohmura, Makoto Shimoyamada

  Apr. 2017, BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY, 81(4) (4), 755 - 761, English

  [Refereed]

  Scientific journal


• Effect of Shear Rate Distribution on Particle Aggregation in a Stirred Vessel

  Hayato Masuda, Kazuto Tsuda, Keisuke Matsui, Yoshiyuki Komoda, Naoto Ohmura

  Mar. 2017, CHEMICAL ENGINEERING & TECHNOLOGY, 40(3) (3), 493 - 497, English

  [Refereed]

  Scientific journal


• Prediction of onset of Taylor-Couette instability for shear-thinning fluids

  Hayato Masuda, Takafumi Horie, Robert Hubacz, Mitsuhiro Ohta, Naoto Ohmura

  Feb. 2017, RHEOLOGICA ACTA, 56(2) (2), 73 - 84, English

  [Refereed]

  Scientific journal


• Study the Relation between Fermentation Characteristics of Submerged Fluid and Improving the Lactic Acid Production by Fungi

  Narges Ghobadi, Naoya Sasakura, Satoshi Wakai, Chiaki Ogino, Kaoru Yamabe, OHMURA NAOTO

  2017, Journal of Bioprocessing & Biotechniques, 7(2) (2), 300: 1 - 5, English

  [Refereed]

  Scientific journal


• Characterizations of the submerged fermentation of Aspergillus oryzae using a Fullzone impeller in a stirred tank bioreactor

  Narges Ghobadi, Chiaki Ogino, Kaoru Yamabe, Naoto Ohmura

  Jan. 2017, JOURNAL OF BIOSCIENCE AND BIOENGINEERING, 123(1) (1), 101 - 108, English

  [Refereed]

  Scientific journal


• Intensification of Heat sterilization process for liquid foods using Taylor-Couette flow system

  Hayato Masuda, Takafumi Horie, Naoto Ohmura, Makoto Shimoyamada

  Italian Association of Chemical Engineering - AIDIC, 2017, Chemical Engineering Transactions, 57, 1753 - 1758, English

  Scientific journal


• Using a flexible shaft agitator to enhance the rheology of a complex fungal fermentation culture

  Narges Ghobadi, Chiaki Ogino, Tomohiro Ogawa, Naoto Ohmura

  Nov. 2016, BIOPROCESS AND BIOSYSTEMS ENGINEERING, 39(11) (11), 1793 - 1801, English

  [Refereed]

  Scientific journal


• Intensifying the fermentation of Aspergillus oryzae in a stirred bioreactor using maxblend impeller

  Narges Ghobadi, Chiaki Ogino, Naoto Ohmura

  Bentham Science Publishers B.V., Oct. 2016, Open Chemical Engineering Journal, 10, 88 - 109, English

  [Refereed]

  Scientific journal


• Performance evaluation of the new low-power stirring blade

  Daichi Nagatomo, Naoki Yamashita, Katsuhide Takenaka, Keiji Esaki, Naoto Ohmura

  Sep. 2016, Proceedings of 5th Asian Conference on Mixing, 2016 (ACOM2016), 98 - 101, English

  [Refereed]

  International conference proceedings


• Effect of Swingstir impeller on rheology and morphology of submerged fermentation

  Narges Ghobadi, Chiaki Ogino, Tomohiro Ogawa, Naoto Ohmura

  Sep. 2016, Proceedings of 5th Asian Conference on Mixing, 2016 (ACOM2016), 45 - 50, English

  [Refereed]

  International conference proceedings


• Effect of Shear-rate Distribution on particle aggregaation in a stirred vessel

  Hayato Masuda, Kazuto Tsuda, Keisuke Matsui, Yoshiyuki Komoda, Naoto Ohmura

  Sep. 2016, Proceedings of 5th Asian Conference on Mixing, 2016 (ACOM2016), 19 - 22, English

  [Refereed]

  International conference proceedings


• Effective Human Motion of Fresh Cream Mixing Extracted by a Motion Analysis

  Maiko Hara, Hayato Masuda, Takafumi Horie, Sachiko Honda, Naoko Shirasugi, Naoto Ohmura

  Sep. 2016, Proceedings of 5th Asian Conference on Mixing, 2016 (ACOM2016), English

  [Refereed]

  International conference proceedings


• Dispersion Model of Fine Particles under Ultrasonic Irradiation

  FUKUSHIMA Wataru, SUZUKI Hiroshi, HIDEMA Ruri, KOMODA Yoshiyuki, HORIE Takafumi, OHMURA Naoto

  Aug. 2016, Proceedings of The XVIIth International Congress on Rheology (ICR2016), Paper No. 5732, 2pages, English

  International conference proceedings


• Effect of ultrasonic pretreatment on emulsion polymerization of styrene

  Daichi Nagatomo, Takafumi Horie, Chizuru Hongo, Naoto Ohmura

  Jul. 2016, ULTRASONICS SONOCHEMISTRY, 31, 337 - 341, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Process Intensification of a Trickle Bed Reactor with Taylor Flow

  HIRAI Kenta, HORIE Takafumi, TANIYA Keita, KUMAGAI Norihisa, ICHIHASHI Yuichi, OHMURA Naoto, SAKURAI Makoto, MATSUMOTO Hideyuki, MATSUDA Keigo

  The 7th International Symposium on Design, Operation and Control of Chemical Processes (PSE ASIA 2016), Jul. 2016, Proceedings of the 7th International Symposium on Design, Operation and Control of Chemical Processes (PSE ASIA 2016), English

  International conference proceedings


• Estimation of Particle Dispersion in a Stirred Vessel Using a Dynamic Response Modelling

  Naoki YAMASHITA, Hayato MASUDA, Takafumi HORIE, Naoto OHMURA

  The 7th International Symposium on Design, Operation and Control of Chemical Processes (PSE ASIA 2016), Jul. 2016, Proceedings of the 7th International Symposium on Design, Operation and Control of Chemical Processes (PSE ASIA 2016), English

  International conference proceedings


• Optimized Stirred Reactor for Enhanced Particle Dispersion

  Steven Wang, Mo Jiang, Shaliza Ibrahim, Jie Wu, Xin Feng, Xiaoxia Duan, Zhao Yang, Chao Yang, Naoto Ohmura

  Apr. 2016, CHEMICAL ENGINEERING & TECHNOLOGY, 39(4) (4), 680 - 688, English

  [Refereed]

  Scientific journal


• Optimized Stirred Reactor for Enhanced Particle Dispersion

  Naoto Ohmura

  Mar. 2016, Chemical Engineering & Technology, 39(4) (4), 680 - 688, English

  [Refereed]

  Scientific journal


• Effect of ultrasonic pretreatment on emulsion polymerization of styrene

  NAGATOMO DAICHI, HORIE TAKAFUMI, HONGO CHIZURU, OHMURA NAOTO

  Elsevier, Jan. 2016, Ultrasonics Sonochemistry, 31, 337 - 341, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Numerical analysis of the flow of fluids with complex rheological properties in a couette-taylor flow reactor

  Hayato Masuda, Takafumi Horie, Robert Hubacz, Mitsuhiro Ohta, Naoto Ohmura

  Science Council of Japan, Oct. 2015, Theoretical and Applied Mechanics Japan, 63, 25 - 32, English

  [Refereed]

  Scientific journal


• Numerical analysis of the flow of fluids with complex rehological properties in a Couette-Taylor flow reactor

  MASUDA Hayato, HORIE Takafumi, HUBACZ Robert, OHTA Mitsuhiro, OHMURA Naoto

  National Committee for IUTAM, Science Council of Japan, Jun. 2015, Theoretical and Applied Mechanics Japan, 63, 25 - 3.2, English

  [Refereed]

  Scientific journal


• Modeling for Transient Behaviours of Solid Dispersion in a Stirred Vessel

  YAMASHITA Naoki, MASUDA Hayato, HORIE Takafumi, OHMURA Naoto

  15th European Conference on Mixing, Jun. 2015, Proceedings of 15th European Conference on Mixing, 394 - 399, English

  International conference proceedings


• Ultrasound Process Development for Producing Nanofragments from Zirconium Phosphate Particles

  HORIE Takafumi, AKAO Shinsuke, SUZUKI Takayuki, TANAKA Koki, JIA Ning, TANIYA Keita, NISHIYAMA Satoru, OHMURA Naoto

  2nd International Symposium on Multiscale Multiphase Process Engineering (MMPE2014), Sep. 2014, Book of Full-length Manuscript 2nd International Symposium on Multiscale Multiphase Process Engineering (MMPE2014), 182 - 187, English

  International conference proceedings


• Process Development for Ultrasonic Fracturing of Zirconium Phosphate Particles

  Takafumi Horie, Shinsuke Akao, Takayuki Suzuki, Koki Tanaka, Ning Jia, Keita Taniya, Satoru Nishiyama, Naoto Ohmura

  2014, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 47(2) (2), 124 - 129, English

  [Refereed]

  Scientific journal


• Solid-liquid separation by particle-flow-instability

  Steven Wang, Guy Metcalfe, Robert L. Stewart, Jie Wu, Naoto Ohmura, Xin Feng, Chao Yang

  2014, ENERGY & ENVIRONMENTAL SCIENCE, 7(12) (12), 3982 - 3988, English

  [Refereed]

  Scientific journal


• Process intensification of continuous starch hydrolysis with a Couette-Taylor flow reactor

  Hayato Masuda, Takafumi Horie, Robert Hubacz, Naoto Ohmura

  Nov. 2013, CHEMICAL ENGINEERING RESEARCH & DESIGN, 91(11) (11), 2259 - 2264, English

  [Refereed]

  Scientific journal


• Numerical and Experimental Investigation of Continuous Starch Hydrolysis with a Couette-Taylor Flow Reactor

  MASUDA Hayato, HORIE Takafumi, Hubacz Robert, OHMURA NAOTO

  Nov. 2013, Proceedings of the 24 th International Symposium on Transport Phenomena, English

  [Refereed]

  International conference proceedings


• INTENSIFICATION OF STARCH PROCESSING USING APPARATUS WITH COUETTE-TAYLOR FLOW

  Hubacz, Rober, Ohmura, Naoto, Dluska, Ewa

  Sep. 2013, Journal of Food Process Engineering, 36(6) (6), 774 - 785, English

  [Refereed]

  Scientific journal


• Analysis of Couette-Taylor Flow Apparatus for Starch Processing

  HUBACZ Robert, KUREK Piotr, DOMINGUEZ Pablo Rodoriguez, OHMURA Naoto, DLUSKA Ewa

  Sep. 2013, XXI Ogolnopolska Konferencja Inzynierii Chemicznej i Procesowej, English

  [Refereed]

  International conference proceedings


• Inclined-shaft agitation for improved viscous mixing

  Steven Wang, Jie Wu, Naoto Ohmura

  American Chemical Society, Aug. 2013, Industrial and Engineering Chemistry Research, 52(33) (33), 11741 - 11751, English

  [Refereed]

  Scientific journal


• The Application of Dynamical Network Methodology to Characterization of Mixing

  IMAI AKIHISA, KUMAGAI NORIHISA, HORIE TAKAFUMI, OHMURA NAOTO

  Aug. 2013, Proceedings of 9th World Congress of Chemical Engineering, 485, English

  International conference proceedings


• Periodic Operation of Oxidative Dehydrogenation of Propane on V-Mg-O Catalysts

  OZAWA YUSUKE, HORIE TAKAFUMI, OHMURA NAOTO

  Aug. 2013, Proceedings of 9th World Congress of Chemical Engineering, 431, English

  International conference proceedings


• Dynamic Behavior of Isolated Mixing Region in a Stirred Vessel

  TANAKA HISATO, KUMAGAI NORIHISA, HORIE TAKAFUMI, OHMURA NAOTO

  Aug. 2013, Proceedings of 9th World Congress of Chemical Engineering, 482, English

  International conference proceedings


• CUTTING-EDGE RESEARCH AT THE MEMBRANE CENTER IN KOBE UNIVERSITY IN JAPAN

  Hideto Matsuyama, Eiji Kamio, Naoto Ohmura, Hironobu Imakoma, Yoshiyuki Komoda, Takafumi Horie, Yasukiyo Ueda, Kenji Ishida, Satoru Nishiyama, Yuichi Ichihashi

  Feb. 2013, BIOTECHNOLOGY & BIOTECHNOLOGICAL EQUIPMENT, 27(1) (1), 3478 - 3484, English

  [Refereed]

  Scientific journal


• P15 Dispersion of iron phenyl phosphate particles under indirect ultrasonic irradiation(Poster Session)

  Horie Takafumi, Akao Shinsuke, Sakano Saeko, Uenishi Hironobu, Jia Ning, Taniya Keita, Nishiyama Satoru, Ohmura Naoto

  Recently, two-dimensions (2D) nano-structured material such as nanosheet is of great interest for preparation of high surface area catalyst, self-consistent film and so forth. Although there are many studies reported about the nanosheet obtained by ultrasonic dispersion, there are few reports to clarify mechanism of ultrasonic dispersion and derive a dispersion rate equation indispensable for designing ultrasonic apparatus. In this study, FePP ethanol suspension was employed as the model layered material and it can be dispersed to nanosize by the ultrasound. The dispersion process was observed by transmittance change of the suspension. First, the transmittance showed slight change, but after 40 min it was drastically increased. Next, we defined the dispersion ratio by using membrane filter separating particles more than 220nm. By using this, the experimental result could be linearly fitted by the logistic function. Finally, the mechanism was modeled by the random split model. The model clearly reproduced the results and the dispersion mechanism, consequently, could be modeled by the dispersion rate equation based on the logistic function and the random split model.

  The Japan Society of Sonochemistry, 2013, Proceedings of the Annual Meeting of the Japan Society of Sonochemistry, 22, 51 - 52, Japanese


• Enhancement of Gas Hold-Up with a Taylor Vortex Flow System Equipped with Ribs

  Hayato Masuda, Weibin Zheng, Takafumi Horie, Naoto Ohmura

  2013, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 46(1) (1), 27 - 32, English

  Scientific journal


• Enhancement of Gas Hold-Up with a Taylor Vortex Flow System Equipped with Ribs

  Hayato Masuda, Weibin Zheng, Takafumi Horie, Naoto Ohmura

  2013, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 46(1) (1), 27 - 32, English

  [Refereed]

  Scientific journal


• Process Intensification of Continuous Starch Hydrolysis with a Taylor-Couette Flow Reactor

  MASUDA HAYATO, HORIE TAKAFUMI, Robert Hubacz, OHMURA NAOTO

  Sep. 2012, Proc. of 14th European Conference on Mixing, Warsaw, Poland, 293 - 298, English

  International conference proceedings


• Effect of Temperature Change on Transient Organized Structure of Isolated Mixing Regions in Stirred Vessel

  Naoto Ohmura, Hisato Tanaka, Norihisa Kumagai, Takfumi Horie

  Sep. 2012, Proc. of 14th European Conference on Mixing, Warsaw, Poland, 341 - 346, English

  International conference proceedings


• Synthesis of thiol-capped gold nanoparticle with a flow system using organosilane as a reducing agent

  Atsushi Sugie, Hansoo Song, Takafumi Horie, Naoto Ohmura, Kiyoshi Kanie, Atsushi Muramatsu, Atsunori Mori

  Aug. 2012, TETRAHEDRON LETTERS, 53(33) (33), 4457 - 4459, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Sugar consumption and ethanol fermentation by transporter-overexpressed xylose-metabolizing Saccharomyces cerevisiae harboring a xyloseisomerase pathway

  Takanori Tanino, Tomonori Ito, Chiaki Ogino, Naoto Ohmura, Takayuki Ohshima, Akihiko Kondo

  Aug. 2012, JOURNAL OF BIOSCIENCE AND BIOENGINEERING, 114(2) (2), 209 - 211, English

  [Refereed]

  Scientific journal


• Process Intensification of Emulsion Polymerization Using a Compartment Reactor

  Naoto Ohmura, Takafumi Horie, Norihisa Kumagai, Tatsuyuki Esaki, Takaki Yamazaki

  Jul. 2012, CHEMICAL ENGINEERING & TECHNOLOGY, 35(7) (7), 1273 - 1280, English

  [Refereed]

  Scientific journal


• Preface to the special issue for IWPI 2010

  Ohto, M., Matsukuma, Y., Ohmura, N., Ookawara, S., Sotowa, K.-I., Yoshikawa, S.

  2012, Journal of Chemical Engineering of Japan, 45(2) (2)

  Scientific journal


• Advances in mixing technology: Recent advances in mixing research and development

  Hashimoto, S., Ohmura, N., Kim, S.-J., Ibrahim, S.

  2012, International Journal of Chemical Engineering

  Scientific journal


• Preface to the Special Issue for IWPI 2010

  Ohta, Mitsuhiro, Matsukuma, Yosuke, Ohmura, Naoto, Ookawara, Shinichi, Sotowa, Ken-Ichiro, Yoshikawa, Shiro

  2012, Journal of Chemical Engineering of Japan, 45(2) (2), 65 - 65

  Scientific journal


• Operation for Fine Particle Dispersion in Shear-Thinning Fluid in a Stirred Vessel

  Takafumi Horie, Nobuhiro Sakano, Eiji Aizawa, Norihisa Kumagai, Naoto Ohmura

  2012, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 45(4) (4), 258 - 264, English

  Scientific journal


• Operation for Fine Particle Dispersion in Shear-Thinning Fluid in a Stirred Vessel

  Takafumi Horie, Nobuhiro Sakano, Eiji Aizawa, Norihisa Kumagai, Naoto Ohmura

  2012, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 45(4) (4), 258 - 264, English

  [Refereed]

  Scientific journal


• Effect of temperature change on geometric structure of isolated mixing regions in stirred vessel

  Nor Hanizah Shahirudin, Alatengtuya, Norihisa Kumagai, Takafumi Horie, Naoto Ohmura

  2012, International Journal of Chemical Engineering, Vol 2012, Article ID 287051, 6, English

  [Refereed]

  Scientific journal


• Continuous Starch Gelatinization and Hydrolysis with a Taylor-Couette Flow Reactor

  Masuda Hayato, Matsuka Shinichiro, Hubacz Robert, Horie Takafumi, Ohmura Naoto

  Dec. 2011, Proceedings of 3rd International Congress on Green Process Engineering (GPE 2011), English

  International conference proceedings


• Synthesis of Silica Particles with a Segmented Flow Tubular Reactor

  Ohtsuka Yui, Tateishi Kazuya, Horie Takafumi, Ohmura Naoto

  Oct. 2011, Proceedings of 1st International Symposium on Multiscale Multiphase Process Engineering (MMPE), English

  International conference proceedings


• Evaluation of pH and Photocatalyst Concentration Effects on Reaction Rate for Water Purification using Taylor-Couette Flow

  Jia Ning, Horie Takafumi, Ohmura Naoto

  Oct. 2011, Proceedings of 1st International Symposium on Multiscale Multiphase Process Engineering (MMPE), English

  International conference proceedings


• Process intensification of water purification using Taylor Vortex photocatalytic reactor

  Jia Ning, Horie Takafumi, Ohmura Naoto

  Jun. 2011, Proceedings of The 3rd European Process Intensification Conference (EPIC 2011), 157, 149 - 154, English

  International conference proceedings


• 炭酸ガスからの合成ガス生成反応のプロセス強化に向けた速度論的解析

  IKEDA Yusuke, HORIE Takafumi, TANIYA Keita, ICHIHASHI Yuichi, OHMURA Naoto, NISHIYAMA Satoru

  Mar. 2011, 化学工学論文集, Vol. 37. No. 2, pp.128-133, Japanese

  [Refereed]

  Scientific journal


• Preface to the Special Issue for the 3rd ASIAN CONFERENCE ON MIXING (ACOM)

  Takahashi, Koji, Gao, Zhengming, Kajiwara, Toshihisa, Kaminoyama, Meguru, Ohmura, Naoto, Pandi, Aniruddha B.

  2011, Journal of Chemical Engineering of Japan, 44(11) (11), 829 - 829

  Scientific journal


• Preface to the Special Issue "Development of Process Intensification Based on Analysis of Dynamic Phenomena"

  Ohmura, Naoto

  2011, Kagaku Kogaku Ronbunshu, 37(2) (2), 79 - 79

  Scientific journal


• Kinetic Analysis of Syngas Formation from Carbon Dioxide (Dry Reforming of Methane with Carbon Dioxide) for Process Intensification

  Yusuke Ikeda, Takafumi Horie, Keita Taniya, Yuichi Ichihashi, Naoto Ohmura, Satoru Nishiyama

  2011, KAGAKU KOGAKU RONBUNSHU, 37(2) (2), 128 - 133, Japanese

  [Refereed]

  Scientific journal


• Liquid-liquid two phase flow of millichannel with a dynamic mixer

  Takafumi Horie, Keisuke Nakatsune, Taichi Matsumoto, Kazuya Tateishi, Naoto Ohmura

  Jan. 2011, CHEMICAL ENGINEERING AND PROCESSING, 50(1) (1), 1 - 8, English

  [Refereed]

  Scientific journal


• Process Intensification of Continuous Emulsion Polymerization of Vinyl Acetate by a Method of Function Module Representation

  Naoto Ohmura, Norihisa Kumagai, Tatsuyuki Esaki, Takafumi Horie

  2011, KAGAKU KOGAKU RONBUNSHU, 37(2) (2), 134 - 139, Japanese

  [Refereed]

  Scientific journal


• Construction of a xylose-metabolizing yeast by genome integration of xylose isomerase gene and investigation of the effect of xylitol on fermentation

  Takanori Tanino, Atsushi Hotta, Tomonori Ito, Jun Ishii, Ryosuke Yamada, Tomohisa Hasunuma, Chiaki Ogino, Naoto Ohmura, Takayuki Ohshima, Akihiko Kondo

  Nov. 2010, APPLIED MICROBIOLOGY AND BIOTECHNOLOGY, 88(5) (5), 1215 - 1221, English

  [Refereed]

  Scientific journal


• Construction of a xylose-metabolizing Saccharomyces cerevisiae by integration of xylose isomerase gene into the genome and investigation of the effect of xylITOl on fermentation

  Takanori Tanino, Atsushi Hotta, Tomonori Ito, Jun Ishii, Ryosuke Yamada, Tomohisa Hasunuma, Chiaki Ogino, Naoto Ohmura, Takayuki Ohima, Akihiko Kondo

  Nov. 2010, Applied Microbiology and Biotechnology, 88, 1215-1221, English

  [Refereed]

  Scientific journal


• Gelatinization and Enzymatic Saccharification in a Taylor-Couette Flow Reactor

  MATSUKA Shinichiro, YOSHIDA Koji, HUBACZ Robert, HORIE Takafumi, KUMAGAI Norihisa, OHMURA Naoto

  Oct. 2010, Proceedings of 3rd Asian Conference on Mixing, A11, English

  International conference proceedings


• Characteristics of gas-liquid flow in a Taylor vortex flow system with a ribbed rotor

  Zheng Weibin, Horie Takafumi, Ohmura Naoto

  Aug. 2010, Proceedings of 19th International Congress of Chemical and Process Engineering (CHISA 2010), English

  International conference proceedings


• Characteristics of gas-liquid flow in a Taylor vortex flow system with a ribbed rotor

  ZHENG Weibin, HORIE Takafumi, OHMURA Naoto

  Aug. 2010, Full text of 19th International Congress of Chemical and Process Engineering, CHISA 2010, P1.282; 1310, English

  International conference proceedings


• Dispersion of Floating Particles in a Taylor Vortex Flow Reactor

  SAOMOTO Kenjiro, HORIE Takafumi, KUMAGAI Norihisa, TAKIGAWA Teiji, NOUI-MEHIDI Mohamed Nabil, OHMURA Naoto

  The present study investigated the dispersion of floating particles in a Taylor vortex flow reactor experimentally and numerically. The working fluid was glycerin solution and had a density (ρ_f) of 1210 kg·m^-3 and a viscosity (μ) of 0.1 Pa·s. Floating particles of an acrylic resin had a density (ρ_p) of 1190 kg·m^-3.Two groups of particles with mean diameters of 710 and 974μm were discerned. Although particles penetrated the Taylor vortex flow region in the axial direction at different rotational Reynolds numbers, particle segregation was observed. It was confirmed that the smaller particles penetrated deeper in the axial direction. Numerical simulations were also conducted to elucidate the mechanism of particle segregation. Numerical results of a particle-tracking method indicate that the small particles moved on the outermost orbit of a torus. Results of a distinct element method suggest that interparticle collision affected particle transference between vortices.

  The Society of Chemical Engineers, Japan, Jul. 2010, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 43(4) (4), 319 - 325, English

  [Refereed]

  Scientific journal


• Effect of Circulating Flow on particle Dispersion in a Stirred Vessel with Dual Paddle Impellers

  Aizawa, Eiji, Tsuda, Takeaki, Sakano, Nobuhiro, Imakoma, Hironobu, Ohmura, Naoto

  Particle dispersion in a stirred vessel with dual paddle impellers was numerically investigated by a commercial CFD code. The working fluid was assumed a weak shear-thinning non-Newtonian fluid or Newtonian fluid having low viscosity (ca. 4.0 Pa · s). Particles were initially set in the lower half region in the vessel. Numerical simulations were conducted by varying rheological property, location of the impellers and discharge flow rate of impellers. Numerical results showed that the viscosity was lower near the impeller in the non-Newtonian fluid than in the Newtonian fluid due to strong shear near the forefront of impeller. Consequently, the velocity of discharge flow from impeller was larger in the non-Newtonian. Larger velocity of the discharge flow took more particles to the tank wall as compared with Newtonian fluid. The present work adopted the mean value and the standard deviation of particle concentration as particle dispersion indexes. It has been found that the standard deviation depends on particle dispersion process.

  The Society of Powder Technology, Japan, May 2010, Journal of Society of Powder Technology, Japan, Vol 47, No. 5, pp. 317-326(5) (5), 317 - 326, Japanese

  [Refereed]

  Scientific journal


• PREFACE TO THE SPECIAL ISSUE FOR IWPI 2008

  YOSHIKAWA Shiro, SUZUKI Hiroshi, HOMMA Shunji, OHMORI Takao, EGASHIRA Ryuichi, SOTOWA Ken-Ichiro, OHMURA Naoto

  This special issue, "IWPI 2008," is an outcome of the International Workshop on Process Intensification 2008 held in Tokyo, Japan on October 15–18, 2008. This workshop had been organized as the second workshop on this research field in Asia and is held every two years. The main objectives of this workshop were to provide the current achievements and trends on process intensification and share the latest research results among participants. This workshop consisted of 1 plenary lecture, 9 keynote lectures, 22 oral presentations and 83 poster presentations.
  
  All the manuscripts were refereed following the standard procedure for papers submitted to the regular issues of the JCEJ. Twenty papers were approved for publication by the referees.
  
  More than 40 professionals worked as referees for peer reviewing the submitted manuscripts. We, the editors for this special issue, are highly grateful to those referees for their collaboration in the reviewing process. We also express our appreciation to Prof. Yoshiyuki Yamashita of Tokyo University of Agriculture and Technology, the Editor-in-Chief of the JCEJ, for solid support and to Ms. Kazuko Yamashita in the editorial office for her persistent devotion to the preparation of this special issue.

  The Society of Chemical Engineers, Japan, Mar. 2010, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 43(1) (1), 1 - 1, English


• Segmented Flow Tubular Reactorを用いた粒子生成制御

  立石 一矢, 大塚 惟, 熊谷 宜久, 堀江 孝史, 大村 直人

  公益社団法人 化学工学会, 2010, 化学工学会 研究発表講演要旨集, 2010, 10 - 10, Japanese


• 機能性酵母によるバイオエタノール生産プロセスの強化

  伊藤 友教, 内田 敦子, 堀田 淳史, 堀江 孝史, 荻野 千秋, 大村 直人

  公益社団法人 化学工学会, 2010, 化学工学会 研究発表講演要旨集, 2010, 9 - 9, Japanese


• 酵母によるエタノール発酵に及ぼす撹拌剪断効果

  内田 敦子, 伊藤 友教, 堀田 淳史, 堀江 孝史, 荻野 千秋, 大村 直人

  公益社団法人 化学工学会, 2010, 化学工学会 研究発表講演要旨集, 2010, 774 - 774, Japanese


• タービン翼を用いた撹拌槽内のshear-thinning性流体中微粒子分散特性

  阪野 伸大, 相澤 栄次, 堀江 孝史, 熊谷 宜久, 大村 直人

  公益社団法人 化学工学会, 2010, 化学工学会 研究発表講演要旨集, 2010, 776 - 776, Japanese


• テイラー・クエット流装置による澱粉の加水分解反応

  松家 慎一郎, 吉田 皓志, Hubacz Robert, 熊谷 宜久, 堀江 孝史, 大村 直人

  公益社団法人 化学工学会, 2010, 化学工学会 研究発表講演要旨集, 2010, 12 - 12, Japanese


• 光触媒水浄化における流動様式と紫外光照射条件の効果

  堀江 孝史, 辻村 冴子, 賈 寧, 熊谷 宜久, 大村 直人

  公益社団法人 化学工学会, 2010, 化学工学会 研究発表講演要旨集, 2010, 13 - 13, Japanese


• Intensification of bio-ethanol fermentation by recombinant yeast with xylose isomerase pathway

  Tomonori Ito, Atsushi Hotta, Atsuko Uchida, Takanori Tanino, Chiaki Ogino, Akihiko Kondo, Naoto Ohmura

  Italian Association of Chemical Engineering - AIDIC, 2010, Chemical Engineering Transactions, 20, 103 - 108, English

  [Refereed]

  International conference proceedings


• Intensification of Bio-ethanol Fermentation by Recombinant Yeast with Xylose Isomerase Pathway

  Tomonori Ito, Atsushi Hotta, Atsuko Uchida, Takanori Tanino, Chiaki Ogino, Akihiko Kondo, Naoto Ohmura

  2010, IBIC2010: 2ND INTERNATIONAL CONFERENCE ON INDUSTRIAL BIOTECHNOLOGY, 20, 103 - 108, English

  [Refereed]

  International conference proceedings


• Characteristics of Continuous Emulsion Polymerization of Vinyl Acetate with a Compartment Reactor

  Takafumi Horie, Yuka Zenitani, Norihisa Kumagai, Naoto Ohmura

  2010, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 43(1) (1), 70 - 75, English

  [Refereed]

  Scientific journal


• Dispersion of Floating Particles in a Taylor Vortex Flow Reactor

  Kenjiro Saomoto, Takafumi Horie, Norihisa Kumagai, Teiji Takigawa, Mohamed Nabil Noui-Mehidi, Naoto Ohmura

  2010, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 43(4) (4), 319 - 325, English

  [Refereed]

  Scientific journal


• Thermal Power Generated in a Wet Porous Slab by Dielectric Drying

  Hironobu Imakoma, Keiji Tsubota, Takafumi Horie, Naoto Ohmura, Hiroyuki Iyota

  2010, KAGAKU KOGAKU RONBUNSHU, 36(4) (4), 379 - 382, Japanese

  [Refereed]

  Scientific journal


• Correlative Method for Drying Rate Curves of Coated Film with Constant Temperature of Hot Air

  Hironobu Imakoma, Takafumi Horie, Takehiro Yamamoto, Naoto Ohmura

  Nov. 2009, KAGAKU KOGAKU RONBUNSHU, 35(6) (6), 639 - 645, Japanese

  [Refereed]

  Scientific journal


• ENHANCED MIXING OF NEWTONIAN FLUIDS IN A STIRRED VESSEL USING IMPELLER SPEED MODULATION

  Yek, Wei M., Noui-Mehidi, Mohamed N., Parthasarathy, Rajarathinam, Bhattacharya, Sati N., Wu, Jie, Ohmura, Naoto, Nishioka, Nami

  Nov. 2009, Canadian Journal of Chemical Engineering, 87(6) (6), English

  [Refereed]

  Scientific journal


• Oxidative Coupling of Propane with a Two-Layered Catalyst Bed Reactor

  HORIE Takafumi, SATO Yusuke, AIDA Takashi, NISHIYAMA Satoru, OHMURA Naoto

  Oct. 2009, Chemical Product and Process Modeling, Vol. 4, Article 13, 1-11, English

  [Refereed]

  Scientific journal


• Outstanding Paper of 2008,Japanese Source 2008

  Kosuge, H., Ohmura, N.

  2009, Kagaku Kogaku Ronbunshu, 35(4) (4)

  Scientific journal


• JCEJ Outstanding Paper Award of 2008

  Kosuge, H., Ohmura, N.

  2009, Journal of Chemical Engineering of Japan, 42(7) (7)

  Scientific journal


• タービン翼を用いた撹拌槽の混合に及ぼすshear-thinning性の効果

  相澤 栄次, 阪野 伸大, 今駒 博信, 大村 直人

  公益社団法人 化学工学会, 2009, 化学工学会 研究発表講演要旨集, 2009, 112 - 112, Japanese


• Starch hydrolysis in the Couette-Taylor flow reactor

  Hubacz Robert, Ohmura Naoto, Kumagai Norihisa

  The Society of Chemical Engineers, Japan, 2009, 化学工学会 研究発表講演要旨集, 2009, 905 - 905


• 糖代謝ネットワークを強化した酵母による混合糖からのバイオエタノール生産

  堀田 淳史, 伊藤 友教, 内田 敦子, 谷野 孝徳, 荻野 千秋, 大村 直人

  公益社団法人 化学工学会, 2009, 化学工学会 研究発表講演要旨集, 2009, 242 - 242, Japanese


• 撹拌槽内の孤立混合領域にトラップされた粒子が混合に及ぼす効果

  アラタ ントヤ, 堀江 孝史, 大村 直人

  公益社団法人 化学工学会, 2009, 化学工学会 研究発表講演要旨集, 2009, 281 - 281, Japanese


• 連続乳化重合プロセス強化を目指したコンパートメント反応器の性能評価

  堀江 孝史, 銭谷 優香, 熊谷 宜久, 大村 直人

  公益社団法人 化学工学会, 2009, 化学工学会 研究発表講演要旨集, 2009, 243 - 243, Japanese


• 動的撹拌部をもつミリリアクターの液―液分散特性

  中常 敬介, 松本 太一, 堀江 孝史, 大村 直人

  公益社団法人 化学工学会, 2009, 化学工学会 研究発表講演要旨集, 2009, 237 - 237, Japanese


• マイクロ波を利用した粒子層の乾燥固化

  坪田 圭司, 増田 勇紀, 今駒 博信, 大村 直人

  公益社団法人 化学工学会, 2009, 化学工学会 研究発表講演要旨集, 2009, 547 - 547, Japanese


• 槽マトリックスモデルによる乾燥室内の熱風流れモデルの構築法

  堀江 孝史, 今駒 博信, 大村 直人

  公益社団法人 化学工学会, 2009, 化学工学会 研究発表講演要旨集, 2009, 551 - 551, Japanese


• Development of advanced reforming system for H2 station using CO converter equipped with CO2 selective membrane II

  K. Shimada, K. Kuzushita, E. Kamio, H. Matsuyama, N. Ohmura, S. Nishiyama, K. Mae, T. Maki, K. Fujiwara, S. Terada, T. Umegaki, O. Okada

  2009, ECS Transactions, 17(1) (1), 589 - 598

  International conference proceedings


• Effect of wall alignment in a very short rotating annulus

  Noui-Mehidi, Mohamed N., Ohmura, Naoto, Nishiyama, Kazuki, Takigawa, Teiji

  2009, Communications in Nonlinear Science and Numerical Simulation, 14(2) (2), English

  [Refereed]

  Scientific journal


• Flow characteristics of immiscible liquid-liquid two phase flow in micro channel systems

  Matsumoto, T., Shikata, T., Takigawa, T., Ohmura, N.

  2009, Theoretical and Applied Mechanics Japan, 57, English

  [Refereed]

  Scientific journal


• Drying Rate and Surface Temperature in Solidification of Glass Particle Layer with Inorganic Binder by Microwave Drying

  Yuki Masuda, Keiji Tsubota, Kenichi Ishii, Hironobu Imakoma, Naoto Ohmura

  2009, KAGAKU KOGAKU RONBUNSHU, 35(2) (2), 229 - 231, Japanese

  [Refereed]

  Scientific journal


• Measurement of Drying Rate of Glue Coating by Modified Temperature Change Method

  Takehiro Yamamoto, Eiji Aizawa, Hironobu Imakoma, Naoto Ohmura

  2009, KAGAKU KOGAKU RONBUNSHU, 35(2) (2), 246 - 251, Japanese

  [Refereed]

  Scientific journal


• Effect of Microwave on Solidification of Particle Layer by Drying

  Keiji Tsubota, Yuki Masuda, Eisuke Yamaguchi, Hironobu Imakoma, Naoto Ohmura

  2009, KAGAKU KOGAKU RONBUNSHU, 35(3) (3), 279 - 281, Japanese

  [Refereed]

  Scientific journal


• Drying Rate and Surface Optical Characteristic of Slurry Coating

  Takehiro Yamamoto, Eiji Aizawa, Hironobu Imakoma, Yoshiyuki Komoda, Naoto Ohmura

  2009, KAGAKU KOGAKU RONBUNSHU, 35(3) (3), 297 - 303, Japanese

  [Refereed]

  Scientific journal


• Effect of Particle Motion in Isolated Mixing Regions on Mixing in Stirred Vessel

  Alatengtuya, Nami Nishioka, Takafumi Horie, Mohamed N. Noui-Mehidi, Naoto Ohmura

  2009, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 42(7) (7), 459 - 463, English

  [Refereed]

  Scientific journal


• Measurement of Drying Rate of an Acrylic Emulsion Paint by the Temperature Change Method and an Examination of the Method

  Hironobu IMAKOMA, Shingo NAGAOKA, Eiji AIZAWA, Takehiro YAMAMOTO, Naoto OHMURA

  Dec. 2008, toso kogaku, 43(12)410-416, 410 - 416, Japanese

  [Refereed]

  Scientific journal


• Analysis of quasi-steady acceleration in circular Couette flow

  Mohamed N. Noui-Mehidi, Jawaid I. Inayat-Hussain, Naoto Ohmura

  Nov. 2008, COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION, 13(9) (9), 1796 - 1800, English

  [Refereed]

  Scientific journal


• Bioethanol Production from Sugars by Yeast Having Sugar Uptake Ability by Expression of Sugar Transporter

  TANINO Takanori, OGINO Chiaki, KUMAGAI Norihisa, OHMURA Naoto

  Sep. 2008, Proceedings of the 10th International Chemical and Biological Engineering Conference-CHEMPOR 2008, Braga, Portugal (on CD-ROM), E20, 4pages, English

  [Refereed]

  Scientific journal


• Outstanding Paper of 2007

  KOSUGE Hitoshi, OHMURA Naoto

  The Outstanding Paper Award Subcommittee has assessed the 93 papers published in 2007 (vol. 33), and the editorial board finally selected the following two papers for Kagaku Kogaku Ronbunshu Paper Awards of 2007: "An Investigation of Primary Particle Growth and Aggregate Formation of Soot Using a Numerical Model Considering the Sintering of Primary Particles," and "A Method for Setting Buffer Times between Batches with Uncertain Processing Times."

  The Society of Chemical Engineers, Japan, Jul. 2008, Chemical engineering, 34(4) (4), 415 - 416, Japanese


• A Model of Continuous Hot-Air Drying of Film Coated with Water-Based Polymer in an Unsteady-State Operation

  Hironobu Imakoma, Eiji Aizawa, Naoto Ohmura

  Jul. 2008, KAGAKU KOGAKU RONBUNSHU, 34(4) (4), 463 - 470, Japanese

  [Refereed]

  Scientific journal


• 材料温度変化法を用いた水性アクリルエマルジョン塗料膜の乾燥速度測定

  山本 剛大, 長岡 真吾, 相澤 英次, 大村 直人, 今駒 博信

  公益社団法人 化学工学会, 2008, 化学工学会 研究発表講演要旨集, 2008, 1065 - 1065, Japanese


• 無機バインダー水溶液を用いたガラス微粒子層のマイクロ波による乾燥固化

  増田 勇紀, 坪田 圭司, 石井 健一, 今駒 博信, 大村 直人

  公益社団法人 化学工学会, 2008, 化学工学会 研究発表講演要旨集, 2008, 1064 - 1064, Japanese


• 動的撹拌部をもつ微小流路反応器の特性評価

  中常 敬介, 四方 智之, 松本 太一, 熊谷 宜久, 大村 直人

  公益社団法人 化学工学会, 2008, 化学工学会 研究発表講演要旨集, 2008, 581 - 581, Japanese


• テイラー渦流における低密度粒子の分級挙動

  大村 直人, 竿本 建次郎, 山脇 健司, 熊谷 宣久

  公益社団法人 化学工学会, 2008, 化学工学会 研究発表講演要旨集, 2008, 8 - 8, Japanese


• Characterisation of isolated mixing regions in a stirred vessel

  Mohamed Nabil Noui-Mehidi, Naoto Ohmura, Jie Wu, Bon Van Nguyen, Nami Nishioka, Teiji Takigawa

  2008, INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING, 6, English

  [Refereed]

  Scientific journal


• Reaction/coagulation dynamics in a continuous emulsion polymerization process of vinyl acetate

  Naoto Ohmura, Yuka Zenitani, Koudai Nagata, Norihisa Kumagai, Teiji Takigawa, Hironobu Imakoma

  Jan. 2008, KAGAKU KOGAKU RONBUNSHU, 34(1) (1), 125 - 129, Japanese

  [Refereed]

  Scientific journal


• Analysis of Quasi-Steady Acceleration in Circular Couette Flow

  NOUI-MEHIDI Mohamed Nabil, INAYAT-HUSSAIN Jawaid I, OHMURA Naoto

  Jan. 2008, Communications in Nonlinear Science and Simulation, (in press), English

  [Refereed]

  Scientific journal


• Patricle Migration in a Stirred Vessel at Low Reynolds Numbers

  NISHIOKA Nami, TAGO Yohei, TAKIGAWA Teiji, NOUI-MEHIDI Mohamed, Nabil, WU Jie, OHMURA Naoto

  Dec. 2007, AIDIC Conference Series, Selected Papers of the eight Italian Conference on Chemical and Process Engineering, 8, 243-248, English

  [Refereed]

  International conference proceedings


• Laminar Spirals in the Outer Stationary Cylinder Couette-Taylor System

  NOUI-MEHIDI Mohamed Nabil, BLACKBUM M. H, OHMURA Naoto

  Dec. 2007, Proceedings of the 16th Australasian Fluid Mechanics Conference, Crown Plaza, Gold Coast Australia, 411-413 (on CD-ROM), English

  [Refereed]

  International conference proceedings


• Gas-Liquid Two-Phase Flow in a Taylor Vortex Flow Reactor

  YAMAWAKI Kenji, HOSOI Hiroyuki, TAKIGAWA Teiji, NOUI-MEHIDI Mohamed Nabil, OHMURA Naoto

  Dec. 2007, AIDIC Conference Series, Selected Papers of the eight Italian Conference on Chemical and Process Engineering, 335-340, English

  [Refereed]

  International conference proceedings


• Functionalization of Casting Mould by MicroWave Drying

  MASUDA Yuki, IMAKOMA Hironobu, OHMURA Naoto, YAMAGUCHI Eisuke

  Dec. 2007, AIDIC Conference Series, Selected Papers of the eight Italian Conference on Chemical and Process Engineering, 8, 203-209, English

  [Refereed]

  International conference proceedings


• Improving heat transfer with Taylor vortices in a compact modified Couette-Taylor apparatus

  Mohamed Nabil Noui-Mehidi, Naoto Ohmura, Kazuki Nishiyama, Jie Wu

  Nov. 2007, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 40(11) (11), 951 - 956, English

  [Refereed]

  Scientific journal


• Instabilities of Immiscible Liquid-Liquid Two-Phase Laminar Flow in a Micro Channel

  MATSUMOTO Taichi, SHIKATA Tomoyuki, TAKIGAWA Teiji, OHMURA Naoto

  Sep. 2007, Proceedings of European Conference of Chemical Engineering, Copenhagen, Denmark, 8 pages (on CD-ROM), English

  [Refereed]

  International conference proceedings


• Selective separation of CO2 by using novel facilitated transport membrane at elevated temperatures and pressures

  R. Yegani, H. Hirozawa, M. Teramoto, H. Himei, O. Okada, T. Takigawa, N. Ohmura, N. Matsumiya, H. Matsuyama

  Mar. 2007, Journal of Membrane Science, 291(1-2) (1-2), 157 - 164, English

  [Refereed]

  Scientific journal


• Stochastic Modeling of Dynamic Behavior of Particle Size Distribution in Continuous Emulsion Polymerization

  YANO Takeshi, ENDO Kimitaka, NAGAMITSU Manabu, ANDO Yasuki, TAKIGAWA Teiji, OHMURA Naoto

  To gain a better understanding of the dynamic behavior of continuous emulsion polymerization, the authors developed a simple stochastic model which considers the competitive interaction between polymerization reaction and aggregation of latex particles. The numerical results were then compared with the experimental data from continuous emulsion polymerization of vinyl acetate carried out under various operating conditions. The numerical and experimental results showed satisfactory agreement. It was found that the dynamic behavior of particle size distribution is affected by latex particle aggregation and the feed flow rate.

  The Society of Chemical Engineers, Japan, Mar. 2007, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 40(3) (3), 228 - 234, English

  [Refereed]

  Scientific journal


• Process intensification in fluid and particle engineering - Preface

  Ohmura, Naoto, Yoshikawa, Shiro, Honma, Shunji

  2007, Journal of Chemical Engineering of Japan, 40(11) (11)

  Scientific journal


• Development of CO2 selective membrane used in high temperature condition for application to membrane reactor

  Yegani Reza

  The Society of Chemical Engineers, Japan, 2007, 化学工学会 研究発表講演要旨集, 2007, 587 - 587


• 連続乳化重合プロセスにおけるラテックス粒子径の変動挙動

  永田 晃大, 銭谷 優香, 熊谷 宣久, 瀧川 悌二, 大村 直人

  公益社団法人 化学工学会, 2007, 化学工学会 研究発表講演要旨集, 2007, 71 - 71, Japanese


• 共軸回転二重円筒間の気液二相流の流動・混合特性

  山脇 健司, 細井 博之, 竿本 建次郎, 神代 早紀, 瀧川 悌二, 大村 直人

  公益社団法人 化学工学会, 2007, 化学工学会 研究発表講演要旨集, 2007, 72 - 72, Japanese


• 撹拌槽内の層流場における粒子の移動挙動

  西岡 奈美, 田合 洋平, 瀧川 悌二, 大村 直人

  公益社団法人 化学工学会, 2007, 化学工学会 研究発表講演要旨集, 2007, 316 - 316, Japanese


• Two Liquid Flows with Different Physical Properties in a Millimeter-Channel System

  OHMURA Naoto, SHIKATA Tomoyuki, YASHIMA, YASHIMA Teruyuki, TAKIGAWA Teiji

  Aug. 2006, Proceedings of the 11th APCChE CONGRESS 2006, CD-ROM,Paper ID 336, 5 pages, English

  [Refereed]

  International conference proceedings


• Experimental Observation of Flow Patterns in Taylor Couette Flow with an Axial Flow

  OHMURA Naoto, HOSOI Hiroyuki, ASAMURA Yuichi, NARIKAWA Takashi, ODAGAWA Tomohiko, TAKIGAWA Teiji

  Aug. 2006, Proceedings of the 11th APCChE CONGRESS 2006, CD-ROM,Paper ID 337, 4 pages, English

  [Refereed]

  International conference proceedings


• CO変成触媒反応器に適用するCO2選択透過膜の開発

  広沢 洋帆, 寺本 正明, Yegani Reza, 姫井 浩明, 岡田 治, 曽谷 知弘, 大村 直人, 松山 秀人

  公益社団法人 化学工学会, 2006, 化学工学会 研究発表講演要旨集, 2006, 346 - 346, Japanese


• 多粒子間凝集を考慮した連続乳化重合の確率モデル

  矢野 武史, 長光 学, 永田 晃大, 瀧川 悌二, 大村 直人

  公益社団法人 化学工学会, 2006, 化学工学会 研究発表講演要旨集, 2006, 201 - 201, Japanese


• 撹拌槽内の層流場における混合制御

  西岡 奈美, 宮本 稔, 瀧川 悌二, 大村 直人

  公益社団法人 化学工学会, 2006, 化学工学会 研究発表講演要旨集, 2006, 835 - 835, Japanese


• 往復振動型撹拌装置を用いた連続乳化重合の重合特性

  永田 晃大, 長光 学, 矢野 武史, 瀧川 悌二, 大村 直人

  公益社団法人 化学工学会, 2006, 化学工学会 研究発表講演要旨集, 2006, 846 - 846, Japanese


• Emulsion polymerization of vinyl acetate in a system of two CSTR in series

  N Ohmura, M Nagamitsu, K Kondo, T Yano, H Usui

  Sep. 2005, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 38(9) (9), 722 - 726, English

  [Refereed]

  Scientific journal


• Dynamics of the helical flow between rotating conical cylinders

  MN Noui-Mehidi, N Ohmura, K Kataoka

  Apr. 2005, JOURNAL OF FLUIDS AND STRUCTURES, 20(3) (3), 331 - 344, English

  [Refereed]

  Scientific journal


• 構成論的モデルによる連続乳化重合の粒子径自励振動現象の解析

  大村 直人, 遠藤 公高, 安藤 康喜, 長光 学, 矢野 武史

  公益社団法人 化学工学会, 2005, 化学工学会 研究発表講演要旨集, 2005, 583 - 583, Japanese


• Particle classification in Taylor vortex flow with an axial flow

  N. Ohmura, T. Suemasu, Y. Asamura

  2005, 14TH INTERNATIONAL COUETTE TAYLOR WORKSHOP, 14, 64 - 71, English

  [Refereed]

  International conference proceedings


• A numerical study of Taylor vortex flow in a finite length tapered annulus

  M. N. Noui-Mehidi, N. Ohmura, J. Wu

  2005, 14TH INTERNATIONAL COUETTE TAYLOR WORKSHOP, 14, 20 - 29, English

  [Refereed]

  International conference proceedings


• Regular regime and drying characteristic function of porous slab with surface resistance for mass transfer

  H Imakoma, M Yoshida, M Miyahara, N Ohmura

  May 2004, KAGAKU KOGAKU RONBUNSHU, 30(3) (3), 368 - 371, Japanese

  [Refereed]

  Scientific journal


• Time-Dependent Flow Properties in Doubly Periodic and Weakly Turbulent Wavy Vortex Flows in a Taylor-Couette Flow System

  OHMURA Naoto, AOKI Tadashi, OKAMOTO Hirokazu, KATAOKA Kunio

  The purpose of the present work is to investigate time-dependent flow properties in doubly periodic and weakly turbulent wavy vortex flows in a Taylor–Couette flow system with the aid of a wavelet analysis. Time series data of fluctuating tangential velocity were obtained with a fiberoptic laser-Doppler velocimeter. To clarify the dependence of time-fluctuation flow properties on spatial location, the velocity was measured at many positions within each vortex. In order to estimate wavelet correlation patterns, logarithmic expectation and information entropy were calculated at each time scale. The wavelet patterns revealed that the time-fluctuation properties depend not only on the spatial location but also on time. The continuous wavelet transform analysis can provide a promising technique to reveal the fractal structure of a chaotic wavy vortex flow.

  The Society of Chemical Engineers, Japan, Apr. 2004, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 37(4) (4), 572 - 576, English

  [Refereed]

  Scientific journal


• Mixing characteristics in a conical Taylor-Couette flow system at low Reynolds numbers

  N Ohmura, MN Noui-Mehidi, K Sasaki, K Kitajima, K Kataoka

  Apr. 2004, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 37(4) (4), 546 - 550, English

  [Refereed]

  Scientific journal


• Prediction of adsorption rate on slab with an adsorption amount-dependent diffusion coefficient

  Hironobu Imakoma, Masamichi Yoshida, Minoru Miyahara, Naoto Ohmura

  Mar. 2004, Kagaku Kogaku Ronbunshu, 30(2) (2), 243 - 245, Japanese

  [Refereed]

  Scientific journal


• Effect of the emulsifier on the dynamic behavior of particle size distribution in continuous emulsion polymerization of vinyl acetate

  N Ohmura, S Matsuzaki, K Kondo, K Kataoka

  Mar. 2004, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 37(3) (3), 461 - 464, English

  [Refereed]

  Scientific journal


• Time-dependent structures of a two-dimensional turbulent impinging jet accompanied by longitudinal vortex pairs

  K Kataoka, T Ochi, K Uyama, N Ohmura

  Feb. 2004, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 37(2) (2), 299 - 303, English

  [Refereed]

  Scientific journal


• Mixing Characteristics of a "VIBRO MIXER^【○!R】" Vibration Mixer

  OHMURA Naoto, KOMURA Takanobu, MIYAMOTO Minoru, FUSE Masanori, TANIGUCHI Toru, KATAOKA Kunio

  Mixing in a continuous vibrating mixer named “VIBRO MIXER^®” has been observed with the aid of a visualization technique and a tracer response technique. The mixer consists of several mixing units having a spiral impeller going up and down. It has been found that homogeneous and rapid mixing can be obtained owing to the spiral structure of the impeller and the holes opened in the impeller. On the other hand, mixing between units is inhibited by a partition plate. Owing to the coupling of these two mixing effects, the mixer is regarded as a plug-flow type mixing device. When the mixer is operated under sufficiently high mixing Reynolds number and space velocity, the mixing can be described as a tanks-in-series model having the same number of tanks as the mixing unit.

  The Society of Chemical Engineers, Japan, Jan. 2004, KAGAKU KOGAKU RONBUNSHU, 30(1) (1), 1 - 6, Japanese

  [Refereed]

  Scientific journal


• Combined convective and microwave drying of porous material wetted with polymer solutions

  Hironobu Imakoma, Kazuhiko Kawamura, Keiji Tsubota, Kazuya Kubo, Naoto Ohmura

  Jan. 2004, Kagaku Kogaku Ronbunshu, 30(1) (1), 98 - 101, Japanese

  [Refereed]

  Scientific journal


• Control of polymer content profile within dried porous material wetted with aqueous polymer solution by sequential drying with microwave and convection

  Hironobu Imakoma, Kazuhiko Kawamura, Kazuya Kubo, Naoto Ohmura

  Jan. 2004, Kagaku Kogaku Ronbunshu, 30(1) (1), 91 - 94, Japanese

  [Refereed]

  Scientific journal


• 表面物質移動抵抗をもつ多孔平板のregular rigimeと乾燥特性関数

  今駒 博信, 吉田 正道, 宮原 稔, 大村 直人

  2004, 化学工業論文集, 30(3),368-371, Japanese

  [Refereed]

  Scientific journal


• 吸着量依存型拡散係数を有する平板材料への吸着速度の推定

  今駒 博信, 吉田 正道, 宮原 稔, 大村 直人

  2004, 化学工学論文集, 30(2),243-245, Japanese

  [Refereed]

  Scientific journal


• 含高分子液体で湿った多孔体のマイクロ波併用熱風対流乾燥挙動

  今駒 博信, 河村 和彦, 坪田 圭司, 久保 和也, 大村 直人

  2004, 化学工学論文集, 30(1),98-101, Japanese

  [Refereed]

  Scientific journal


• マイクロ波熱風対流逐次乾燥法を用いた高分子水溶液で湿った多孔体の含高分子率分布制御

  今駒 博信, 河村 和彦, 久保 和也, 大村 直人

  2004, 化学工学論文集, 30(1),91-94, Japanese

  [Refereed]

  Scientific journal


• Observation of Mixing Behaviors in a Conical Taylor-Couette Flow System at Low Reynolds Numbers

  OHMURA Naoto, SASAKI Kenji, KIAJIMA kazuhiro, NOUI-MEHIDI Nabil M, KONDO Kentaro, NAKATA Masaaki, KATAOKA Kunio

  2004, Proceedings of the International Conference on Fluid and Thermal Energy Conversion 2003, Paper No. 6(on CD-ROM), English

  International conference proceedings


• Modeling Transient Heat Transfer from a Heat Source of Power Electronic Devices

  KATAOKA Kunio, UYAMA Ken, ASAUMI Yuji, OHMURA Naoto, YOSHIMURA Tokuo

  2004, AIDIC Conference Series: Selected Papers of the Sixth Italian Conference on Chemical and Process Engineering, Reed Business Information, Vol. 6, pp.165-171, English

  [Refereed]

  Scientific journal


• Gap Effect on Taylor Vortex Size Between Rotating Conical Cylinders

  NOUI-MEHIDI Nabil M, OHMURA Naoto, KATAOKA Kunio

  2004, Proceedings of the 15th Australasian Fluid Mechanics Conference,CD-ROM, English

  [Refereed]

  International conference proceedings


• Emulsion Polymerization of vinyl Acetate in a System of Two CSTR in Series

  OHMURA Naoto, NAGAMITSU Manabu, KONDO Kentaro, YANO Takeshi, USUI Hiromoto

  Emulsion polymerization of vinyl acetate was performed in a system of two continuous stirred tank reactors in series to observe dynamic chemical processes. Monomer and an aqueous solution of initiator and emulsifier were separately and continuously fed into the first reactor. The concentration of emulsifier was considerably lower than the critical micelle concentration. The reacting latex solution discharged from the first reactor was fed into the second reactor. The mean residence time and the speed of the rotational impeller were varied as control parameters. After a transitional period, a steady state of almost constant monomer conversion was attained. Even while this steady state was maintained, the particle-size distribution varied periodically. The mean diameter of latex particles also oscillated over time. A broader distribution was obtained in the second reactor, where, from a certain sampling time, a bimodal particle- size distribution was observed. These results indicate that the aggregation process predominates over the reaction process in the second reactor. It was also found that oscillatory behavior can be controlled by adjusting the rotational speed of the impeller and the mean residence time, with the former influencing the amplitude of oscillation and the latter the period thereof.

  The Society of Chemical Engineers, Japan, 2004, Proceedings of the 10th APPCCHE, Paper №0193 on CD-ROM, 973 - 973, English

  [Refereed]

  Scientific journal


• Effect of Aggregation of Polymer Particles on Particle Size Distribution in Continuous Emulsion Polymerization of Vinyl Acetate

  OHMURA Naoto, MATSUZAKI Shigefumi, KONDO Kentaro, KATAOKA Kunio

  2004, Proceedings of the 6th Italian Conference on Chemical and Process Engineering, Vol. 3,pp.1319-1324, English

  International conference proceedings


• Transition of organized flow structure in a stirred vessel at low Reynolds numbers

  N Ohmura, T Makino, T Kaise, K Kataoka

  Dec. 2003, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 36(12) (12), 1458 - 1463, English

  [Refereed]

  Scientific journal


• Prediction of polymer content profile in convective dried porous slab wetted with polymer solution

  K Kubo, H Imakoma, N Ohmura, A Toritani

  Nov. 2003, KAGAKU KOGAKU RONBUNSHU, 29(6) (6), 819 - 822, Japanese

  [Refereed]

  Scientific journal


• Continuous Emulsion Polymerization of Vinyl Acetate with Periodic Alternation of Reaction Temperature

  OHMURA NAOTO, MATSUZAKI SHIGEFUMI, YANO TAKESHI, KITAMOTO KEIGO, KATAOKA KUNIO

  Periodic operation of reaction temperature was examined as a means to control latex particle size distribution in the continuous emulsion polymerization of vinyl acetate. The experiment was conducted in a CSTR under conditions below the critical micelle concentration of the emulsifier. The monomer conversion attained in a time-independent steady-state operation showed a dramatic rise from 0 to over 60% at a critical reaction temperature of T_c=53°C. The dynamic operation was performed by switching the reaction temperature between two values, one of which gives a very low monomer conversion and the other a high monomer conversion in the usual steady-state operation. The periodicswitching induced oscillations in monomer conversion, and the particle size distribution (PSD) varied synchronously with the switching operation.

  The Society of Chemical Engineers, Japan, May 2003, KAGAKU KOGAKU RONBUNSHU, 29(3) (3), 378 - 381, Japanese

  [Refereed]

  Scientific journal


• Dynamics of Emulsion Polymerization of Vinyl Acetate by Batch and Continuous Flow Operations

  KATAOKA KUNIO, OHMURA NAOTO, YANO TAKESHI, MATSUZAKI SHIGEFUMI, KONDO KENTARO

  化学工学会, May 2003, 化学工学論文集, 29(3) (3), 363 - 367, Japanese

  [Refereed]

  Scientific journal


• Dynamics of a surface bump generated by an air-water free surface jet impingement

  JX Zheng, K Kataoka, T Yoshimura, N Ohmura

  Feb. 2003, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 36(2) (2), 147 - 154, English

  Scientific journal


• 含高分子液体で湿った多孔体のマイクロ波併用対流乾燥

  坪田 圭司, 中村 真理子, 今駒 博信, 久保田 克之, 大村 直人, 河村 和彦

  公益社団法人 化学工学会, 2003, 化学工学会 研究発表講演要旨集, 2003, 175 - 175, Japanese


• 含高分子液体で湿った多孔平板の対流乾燥における乾燥速度の推定

  久保 和也, 今駒 博信, 鳥谷 明弘, 大村 直人, 久保田 克之

  公益社団法人 化学工学会, 2003, 化学工学会 研究発表講演要旨集, 2003, 180 - 180, Japanese


• ラテックスをバインダーとして用いた収縮性繊維質薄層の対流_-_伝導乾燥

  森 剛志, 今駒 博信, 淺野 賢三, 鳥谷 明弘, 大村 直人, 久保田 克之

  公益社団法人 化学工学会, 2003, 化学工学会 研究発表講演要旨集, 2003, 178 - 178, Japanese


• 連続乳化重合における反応器の滞留時間分布が粒子径に及ぼす影響

  大村 直人, 近藤 健太郎, 松崎 慈文, 近藤 正俊, 片岡 邦夫

  公益社団法人 化学工学会, 2003, 化学工学会 研究発表講演要旨集, 2003, 428 - 428, Japanese


• Convective-conductive Drying of a Thin Shrinkable Fibrous Layer Wetted with Latex as a Binder

  Hironobu Imakoma, Takeshi Mori, Naoto Ohmura, Masamichi Yoshida, Akihiro Toritani

  Society of Chemical Engineers, Japan, 2003, Kagaku Kogaku Ronbunshu, 29(5) (5), 722 - 725, Japanese

  [Refereed]

  Scientific journal


• Drying of Wet Porous Material Using a Combined Convective and Microwave Dryer of Laboratory Scale

  Hironobu Imakoma, Daisuke Katsura, Naoto Ohmura, Kazuhiko Kawamura

  Society of Chemical Engineers, Japan, 2003, Kagaku Kogaku Ronbunshu, 29(5) (5), 718 - 721, Japanese

  [Refereed]

  Scientific journal


• 含高分子液体で湿った多孔平板の対流乾燥における含高分子率分布の推定

  久保 和也, 今駒 博信, 大村 直人, 鳥谷 明弘

  2003, 化学工学論文集, 29(6),819-822, Japanese

  [Refereed]

  Scientific journal


• ラテックスをバインダーとして用いた繊維質収縮性薄層の対流－伝導乾燥

  今駒 博信, 森 剛志, 大村 直人, 吉田 正道, 鳥谷 明弘

  2003, 化学工学論文集, 29(5),722-725, Japanese

  [Refereed]

  Scientific journal


• マイクロ波併用熱風対流乾燥実験装置による湿り多孔体の乾燥挙動

  今駒 博信, 桂 大輔, 大村 直人, 河村 和彦

  2003, 化学工学論文集, 29(5),718-721, Japanese

  [Refereed]

  Scientific journal


• Effect of Inhomogeneous Mixing on Chemical Reaction in a Taylor Vortex Flow Reactor

  OHMURA Naoto, OKAMOTO Hirokazu, MAKINO Tsukasa, KATAOKA Kunio

  Effect of inhomogeneous mixing on chemical reactions in a Taylor vortex flow reactor was experimentally investigated by using a second-order reaction system. The flow-visualization experiment by a laser induced fluorescence method was also carried out to observe the cross-sectional view of mixing behavior in the inside of Taylor vortex cells. In the reaction experiment, the reaction among hydrogen peroxide, iodide ions and hydrogen ions, i.e. 2H⁺ + 2I^– + H₂O₂ → I₂ + 2H₂O, was used. The temporal evolution of the concentration of iodine was observed from the temporal variation of color of iodine. The flow-visualization experiment clearly revealed the existence of two different mixing zones within a Taylor vortex cell at low Reynolds numbers. Namely, the fluid flowing near the cell boundary was axially well-mixed, while the fluid element confined to the vortex core region was poorly exchanged with the outer well-mixed flow region. This vortex core region, called an isolated mixing region (IMR), decreased as increasing the Reynolds number. It has been found in the reaction experiment that the reaction rate is larger in laminar and singly-periodic wavy Taylor vortex flow regimes than in quasi-periodic and chaotic Taylor vortex flow regimes.

  The Society of Chemical Engineers, Japan, Jul. 2002, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 35(7) (7), 692 - 695, English

  [Refereed]


• Mechanism of mode selection for Taylor vortex flow between coaxial conical rotating cylinders

  Noui-Mehidi, MN, Ohmura, N., Kataoka, K.

  2002, Journal of Fluids and Structures, 16(2) (2)

  Scientific journal


• Laser-optical observation of chaotic mixing structure in a stirred vessel

  Makino, T., Kaise, T., Ohmura, N., Kataoka, K., Adrian, RJ, Durao, DFG, Heitor, MV, Maeda, M., Tropea, C., Whitelaw, JH

  2002, Laser Techniques For Fluid Mechanics

  Scientific journal


• Numerical Computation of Apex Angle Effects on Taylor Vortices in Rotating Conical Cylinders Systems

  NOUI-MEHIDI Mohamed Nabil, OHMURA Naoto, KATAOKA Kunio

  The occurrence of Taylor vortices between two conical cylinders of the inner one rotating and the outer one at rest is numerically simulated by the integration of time-dependent Navier-Stokes equations of the primitive variables. The motion is initiated by a progressive acceleration following a linear path of the inner conical cylinder rotation from the state of rest until its final rotation speed. In the integrated equations, the use of a coordinate transformation permitted to point out the apex angle α in the circular coordinates system and then to study the effects of α on the transient development of the Taylor-vortex structures, the steady states and the flow field characteristics. The numerical calculations have been achieved by the use of the SMAC method applied to a finite difference scheme for the case of a finite length. As a result, the symmetry of the Taylor vortices formed with regard to the mid plane for α = 0 does not exist anymore when the apex angle α becomes greater. The study of the flow field details showed that the contribution of the centrifugal forces becomes more important for increasing α due to the increase of the azimuthal component.

  The Society of Chemical Engineers, Japan, Jan. 2002, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 35(1) (1), 22 - 31, English

  [Refereed]


• Isolated Mixing Region in a Taylor-Vortex-flow Reactor

  MAKINO Tsukasa, KAISE Takuya, SASAKI Kenji, OHMURA Naoto, KATAOKA Kunio

  The purpose of present work was to observe isolated mixing regions (IMRs) under laminar flow conditions in a Taylor-vortex-flow reactor with the aspect ratio Γ = 2. In the range less than Re = 200, the IMRs took clearly the form of two toroidal vortices, one each in the upper and lower circulating flows. A simple core torus was observed in the case of a rotating inner cylinder with smooth surface, while a set of thin tori spirally wrapping around the core of the IMR was observed in the case of an inner cylinder with surface protrusions. Different numbers of tori were obtained for different numbers of protrusions, even at nearly the same Reynolds number. Hence, it can be considered that these structures of IMR depend on periodical perturbations caused by the rotating inner cylinder with protrusions. Numerical investigation using a Lagragian procedure determined the number of perturbations, n_e, during one revolution of a marker particle around the IMR. It was found that n_e corresponded to the number of thin tori. This indicates that the Poincare-Birkhoff theorem is applicable to the geometrical structures of the IMRs.

  The Society of Chemical Engineers, Japan, Sep. 2001, KAGAKU KOGAKU RONBUNSHU, 27(5) (5), 566 - 573, Japanese

  [Refereed]


• A New Estimation Method of Turbulent Flow Structures Effective for Impingement Heat Transfer Augmentation

  KISHIMOTO Shinya, ZHENG Jianxing, OCHI Takayuki, YOSHIMURA Tokuo, OHMURA Naoto, KATAOKA Kunio

  The primary purpose of this work is to construct a new method how to define the turbulent flow structures effective for heat transfer augmentation. The flow field consists of a submerged liquid jet issuing from a convergent slot nozzle and a circular cylinder for heat transfer placed perpendicular to and on the jet centerline. Two small cylinders were inserted into the jet stream to examine the effectiveness of heat transfer augmentation. Time-series data of the jet centerline velocities were analyzed by a wavelet transformation. The information entropy and expectation can successfully extract the intermittent turbulent structures effective for the impingement heat transfer augmentation from the developing jet structures.

  The Society of Chemical Engineers, Japan, Sep. 2001, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 34(9) (9), 1136 - 1140, English

  [Refereed]


• Flow Mechanism of a Submerged Jet Impinging on a Free Interface

  ZHENG Jianxing, KISHIMOTO Shinya, OCHI Takayuki, YOSHIMURA Tokuo, OHMURA Naoto, KATAOKA Kunio

  This paper reports time-dependent flow characteristics of a turbulent water jet impinging vertically upward upon a water-air interface. Mexican-hat wavelet transform was applied to the time-dependent velocity fluctuations obtained in the region near to the air-water interface in order to analyze spatiotemporal turbulent structure at different time scales. The further understanding of the physical meanings of the wavelet transforms was tried by the analysis using logarithmic expectation and information entropy of information theory. It has been found that the near-interface turbulent structure is constituted not only by the impingement of the large-scale structure of the approaching turbulent jet but also by the time-dependent deformation of the surface bump. Time-series images of the surface bump visualized by an argon laser sheet technique showed some periodical regulation of the surface bump coming from the large-scale structure of the impinging jet.

  The Society of Chemical Engineers, Japan, Jul. 2001, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 34(7) (7), 912 - 918, English

  [Refereed]


• Observation of Isolated Mixing Regions in a Stirred Vessel

  MAKINO Tsukasa, OHMURA Naoto, KATAOKA Kunio

  The structure of isolated mixing regions was observed in a stirred vessel with the aid of flow-visualization technique. Two toroidal regions were clearly formed respectively above and below the turbine impeller in the range less than Re = 100. Under the condition of this experiment, these regions remained visible for a couple of hours. Under the nearly same rotational condition, a set of three stable filaments surrounding the torus was found in the case of the six-bladed turbine, while a set of four filaments was found in the case of the four-bladed turbine. The velocity fluctuation of flow caused by the rotating turbine blades can be regarded as periodical perturbations for the secondary circulating flow. Hence it can be considered that these structures depend on periodical perturbations caused by the rotating turbine blades. In order to observe the inside structure of ring-doughnut-shaped core regions, the unsteady rotation procedure was applied. Another set of filaments was observed inside the core. It has been found that the isolated mixing regions have complex multi-structures consisting of various KAM tori.

  The Society of Chemical Engineers, Japan, May 2001, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 34(5) (5), 574 - 578, English

  [Refereed]


• Novel operating method for controlling latex particle size distribution in emulsion polymerization of vinyl acetate

  Ohmura, N., Kitamoto, K., Yano, T., Kataoka, K.

  2001, Industrial and Engineering Chemistry Research, 40(23) (23)

  Scientific journal


• Novel operating method for controlling latex particle size distribution in emulsion polymerization of vinyl acetate

  Ohmura, N., Kitamoto, K., Yano, T., Kataoka, K.

  2001, Industrial & Engineering Chemistry Research, 40(23) (23)

  Scientific journal


• G207 Wavelet Analysis of the Transition to Chaotic Flow in Taylor Vortex Flow

  OHMURA Naoto, KATAOKA Kunio, AOKI Tadashi, OKAMOTO Hirokazu

  The purpose of thr present work is to investigate the transition from periodic to chaotic flows in Taylor vortex flow with the aid of a wavelet analysis. Time series data of fluctuating tangential velocity were obtained with a fiberoptic laser-Doppler velocimeter. To clarify the dependence of time-fluctuation flow properties on spatial location, the velocity was measured at several positions within each'vortex. In order to estimate wavelet correlation patterns, logarithmic expectation and information entropy were calculated at each time scale. The wavelet patterns revealed that the time-fluctuation properties depend not only on the spatial location but also time. The continuous wavelet transform analysis can provide a promising technique to reveal a fractal structure of chaotic flow.

  The Japan Society of Mechanical Engineers, 2001, Proceedings of thermal engineering conference, 2001(0) (0), 613 - 614, Japanese

  [Refereed]


• Mixing-Effective Motion of High Viscosity Fluid Around a Rotating Elliptic Cylinder

  TAKIGAWA Teiji, KATAOKA Kunio, EMA Haruhiko, YOSHIMURA Tokuo, OHMURA Naoto

  Mixing-effective motions are both numerically and experimentally studied for a very viscous fluid around a rotating elliptic cylinder installed in a cylindrical vessel. A two-dimensional direct numerical simulation was conducted in an elliptic boundary-fitted curvilinear coordinate system rotating at the same angular velocity as the elliptic cylinder. Time-dependent streamlines and streaklines were observed with the aid of visualization technique. It is found that a mixing-effective (folding) motion actually occurs in the vicinity of the edges of the elliptic cylinder, and that such a motion may result from the unstableness of hyperbolic fixed points on an integrable two-dimensional heteroclinic orbit due to experimentally unavoidable three-dimensional disturbances.

  The Society of Chemical Engineers, Japan, Jun. 2000, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 33(3) (3), 420 - 426, English

  [Refereed]


• Moisture Content Dependence of Anisotropic Effective Thermal Conductivity for Recycled Paper

  IMAKOMA Hironobu, YANO Takuji, KUBOTA Katsuyuki, OHMURA Naoto, KATAOKA Kunio

  Machine-made paper is a typical orthogonal anisotropic material vis-a-vis conductive heat transfer, and the effective thermal conductivity may change with moisture content. Two-dimensional temperature change with time within a layer of recycled paper sheets was measured using by an unsteady heating method with fine hot wire. Repeated the measurement, three-dimensional effective thermal conductivity of the layer was obtained from a set of analytical solution for the conductive heat transfer equation of the anisotropic media. The measured conductivity increases with moisture content on each dimension, and stepwisely near the fiber saturation point, which is estimated through the adsorption isotherm measured in the study.

  The Society of Chemical Engineers, Japan, Jan. 2000, KAGAKU KOGAKU RONBUNSHU, 26(1) (1), 105 - 107, Japanese

  [Refereed]


• Flow structure of a submerged impinging jet near a free interface

  Zheng, J., Kishimoto, S., Ochi, T., Yoshimura, T., Ohmura, N., Kataoka, K.

  2000, Memoirs of the Faculty of Engineering, Kobe University, 47

  Scientific journal


• Analysis of orderliness in higher instabilities toward the occurence of chaos in a Taylor-Couette flow system

  Ohmura, N., Matsumoto, K., Aoki, T., Kataoka, K., Adrian, RJ, Durao, DFG, Durst, F., Heitor, MV, Maeda, M., Whitelaw, JH

  2000, Laser Techniques Applied To Fluid Mechanics

  Scientific journal


• Numerical Study of Swirl Properties of Rotating Conical Channel with Axial Flow

  NOUI - MEHIDI Mohamed Nabil, OHMURA Naoto, KATAOKA Kunio, SALEM Abdelaziz

  This work is concerned with a numerical study of the laminar flow of a viscous fluid between two coaxial cones, with the inner one rotating on which a constant axial flow is imposed. The two cones have the same apex angle value, so that the gap width between them is constant. Two configurations of the same volume are studied: (i) divergent flow passage (Div) and (ii) convergent flow passage (Cov), which represents geometrically the reverse case of (i). Analysis with the aid of the boundary layer assumptions is carried out by the use of an implicit finite difference method. A coordinate transformation is applied to the governing equations in order to remove the explicit effect of the apex angle from the calculation process for both cases, so that the boundary conditions can be simplified. The swirl characteristics are studied in both configurations with regard to the same inlet flux and the same rotation speed of the inner cone. The competition between centrifugal and axially-transporting effects in both cases is discussed. As a result, it is found that the swirl increases in Div from the entrance for a fixed value of the apex angle, while the swirl evolution in Cov depends strongly on the apex angle value.

  The Society of Chemical Engineers, Japan, Dec. 1999, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 32(6) (6), 732 - 741, English

  [Refereed]


• Effect of Reactor Volume on Concentration Oscillations of Belousov-Zhabotinsky Reaction System in CSTR

  OHMURA Naoto, KATAOKA Kunio, TSUKAMOTO Soichi, YANASE Tatsuya

  The effect of reactor volume on concentration oscillations in the cerium-catalyzed Belousov-Zhabotinsky reaction is observed by varying mean residence time of feed as a bifurcation parameter. Three CSTRs different in volume were used in the experiment with the same stirring conditions. Chemical oscillations are investigated by measuring the redox potential between Ce³⁺ and Ce⁴⁺ using a Pt-wire electrode. Owing to the effect of nonlinear coupling between essential chemical oscillations and external forcing oscillations by the peristaltic pump, chaotic oscillations occur in shorter mean residence time. It has been found that this coupling effect affects the greater concentration oscillations in smaller CSTR. At the bifurcation point between single-peak oscillation and chaotic oscillation state, intermittent oscillations are observed. It has been found that stable single-peak oscillations can be observed throughout wide mean-residence-time region with increasing volume of reactor.

  The Society of Chemical Engineers, Japan, Jul. 1999, KAGAKU KOGAKU RONBUNSHU, 25(4) (4), 559 - 563, Japanese

  [Refereed]


• Two-dimensional flow of a very viscous Newtonian fluid around a rotating elliptic cylinder

  Takigawa, T., Kataoka, K., Ema, H., Yoshimura, T., Ohmura, N.

  Proceedings of the 1998 Thirteenth Australasian Fluid Mechanics Conference, Melbourne, Australia, 13-18 December 1998 (Volume 2), 1998, Proceedings of the 1998 Thirteenth Australasian Fluid Mechanics Conference, Melbourne, Australia, 13-18 December 1998 (Volume 2)

  Scientific journal


• Intercellular mass transfer in wavy/turbulent Taylor vortex flow

  Ohmura, N., Makino, T., Motomura, A., Shibata, Y., Kataoka, K.

  1998, International Journal of Heat and Fluid Flow, 19(2) (2)

  Scientific journal


• Controlling particle size by self-sustained oscillations in continuous emulsion polymerization of vinyl acetate

  Ohmura, N., Kataoka, K, a, Watanabe, S., Okubo, M.

  1998, Chemical Engineering Science, 53(12) (12)

  Scientific journal


• Vortex Generation and Properties of Transition to Turbulence in a Taylor-Couette Flow System with Small Aspect Ratio

  OHMURA Naoto, KATAOKA Kunio, KATAOKA Toshiyuki, NAITOH Yoshiyuki

  The generation of vortices and transitional properties to turbulent flow in a Taylor -Couette flow system with an aspect ratio of 3 were investigated in terms of the effect of the acceleration of the inner cylinder rotation speed by using numerical, electrochemical and flow-visualization techniques. The three-dimen-sional simulation based on the SMAC method clarified the generation mechanism of vortices and temporal and spatial properties in a wavy vortex flow. The electrochemical and flow-visualization techniques revealed the temporal and spatial properties in wavy, quasi-periodic wavy and weakly turbulent wavy vortex flows. Lower acceleration rates produced the two-cell primary mode, while the four-cell secondary mode was generated in the case of higher acceleration rates. In a wavy vortex flow, the single fundamental frequencies, which correspond to the passing frequencies of the travelling azimuthal waves, velocity and velocity gradient power spectra depend on the flow modes. In quasi-periodic and weakly turbulent wavy vortex flows, the temporal-spatial properties also largely depend on the cell modes. These results suggest that the geometric structure of vortex cells influences flow characteristics.

  The Society of Chemical Engineers, Japan, Nov. 1997, KAGAKU KOGAKU RONBUNSHU, 23(6) (6), 741 - 748, Japanese

  [Refereed]


• Intercellular mass transfer in waving/turbulent Taylor vortex flow

  Ohmura, N., Makino, T., Motomura, A., Shibata, Y., Kataoka, K., Hanjalic, K., Peeters, TWJ

  1997, Turbulence, Heat and Mass Transfer 2

  Scientific journal


• Effective mass diffusion over cell boundaries in a Taylor-Couette flow system

  Ohmura, N., Kataoka, K., Shibata, Y., Makino, T.

  1997, Chemical Engineering Science, 52(11) (11)

  Scientific journal


• EFFECT OF VORTEX CELL STRUCTURE ON BIFURCATION PROPERTIES IN A TAYLOR VORTEX FLOW SYSTEM

  OHMURA Naoto, KATAOKA Kunio, MIZUMOTO Takeshi, NAKATA Masaaki, MATSUMOTO Kouji

  Bifurcation phenomena in a finite-length Taylor-Couette flow system have been observed by an electrochemical technique. The axial wavelength was varied as the characteristic parameter of vortex cell structure by varying the aspect ratio of the annular flow space and controlling the inner cylinder acceleration up to a steady rotation speed. Multi-resolution analysis in wavelets was used not only for noise reduction, but also for extraction of low frequency components from the experimental time-series data. When the dimensionless axial wavelength λ/d < 1, the first fundamental frequency f₁/f_r of singly periodic wavy vortex flow was fixed at a unique value independent of the magnitude of λ/d. When λ/d ≥ 1, on the other hand, f₁ was not fixed uniquely but showed some variation, depending on the magnitude of λ/d. In the transition to doubly periodic wavy vortex flow, not only Hopf bifurcation but also two-cycle period doubling bifurcation occurred in some cases when λ/d < 1. The first and second fundamental frequencies, f₁ and f₂ have tendencies to increase with increasing λ/d in spite of some exceptions. In the process of a transition to weakly turbulent wavy vortex flow, two-torus motion in phase space broke up at all wavelengths without frequency locking.

  The Society of Chemical Engineers, Japan, Dec. 1995, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 28(6) (6), 758 - 764, English


• Emulsion polymerization of styrene in a continuous Taylor vortex flow reactor

  Kunio Kataoka, Naoto Ohmura, Masato Kouzu, Yosiharu Simamura, Masayoshi Okubo

  1995, Chemical Engineering Science, 50(9) (9), 1409 - 1416, English

  [Refereed]

  Scientific journal


• Electrochemical observation of instabilities of the Belousov-Zhabotinskii reaction in CSTR

  Kataoka, K., Ohmura, N., Watanabe, S., Sumida, K., Deki, S.

  1994, Journal of Applied Electrochemistry, 24(7) (7)

  Scientific journal


• Hysteresis of dynamical transitions in Taylor-Couette flow.

  Kataoka, K., Mizusugi, T., Ueno, H., Ohmura, N.

  1987, ((ed.), Washington, U.S.A., Hemisphere Publishing Corp., 1987, p.270-277. (ISBN 0-89116-572-X)) ((ed.), Washington, U.S.A., Hemisphere Publishing Corp., 1987, p.270-277. (ISBN 0-89116-572-X))

  Scientific journal


• Hysteresis of dynamical transitions in Taylor-Couette flow.

  Kataoka, K., Mizusugi, T., Ueno, H., Ohmura, N.

  1987

  Scientific journal