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Development of a Surfactant Separator by Using Taylor Flows in Microchannels

Research Project

Project/Area Number 20K04267
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 19010:Fluid engineering-related
Research InstitutionKobe University

Principal Investigator

Hayashi Kosuke  神戸大学, 工学研究科, 准教授 (60455152)

Co-Investigator(Kenkyū-buntansha) 冨山 明男  神戸大学, 工学研究科, 教授 (30211402)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords微細流路 / 混相流 / 気泡 / 界面活性剤 / マイクロチャネル / 二相流 / テイラー流
Outline of Research at the Start

界面活性剤は工業分野で需要の高い化学製品であるが、その多くは本来自然界にない化合物であり、処理施設での微生物分解が困難なうえ好気性微生物への酸素供給を阻害する。そのため、製造工程において効率的に回収することが求められる。本研究は、界面活性剤を含む微細流路内テイラー流(砲弾型気泡が並んだ流動様式)の特性を解明し、テイラー流を利用した高効率界面活性剤分離技術の基盤を確立することを目的とする。そのため以下の要素研究を行う:単一微細流路内テイラー流実験による分離性能実証、単一微細流路内テイラー流数値計算による吸脱着ダイナミクスの解明、並列微細流路分離器開発、並列微細流路分離器の分離効率評価モデル構築。

Outline of Final Research Achievements

The experiments revealed that the effects of surfactant on the bubble length and the slug bubble characteristics are not significant in the proposed surfactant separation system. Passing through the microchannel is proved to be effective for reduction of surfactant concentration in the bulk liquid. Under the critical micellar concentration the separation performance is almost linear with respect to the bulk concentration. The surface coverage ratio of Taylor bubbles is much smaller than that for static interface, implying that the advection effect is large and the surfactant molecules accumulate in the rear half of the bubbles. The proposed concentration evaluation technique is thus useful to investigate the surface coverage ratio inside the microchannel. Modeling of the lift force acting on bubbles in the separation vessel was also carried out, and a numerical method was developed to deal with the complex mechanics of fluid particles under contamination.

Academic Significance and Societal Importance of the Research Achievements

世界の水需要は2000年から2050年の間に55%の増加が見込まれている。このため2050年には世界人口の40%が深刻な水不足に陥るとのシナリオが考えられており、水資源問題は流体工学に課された最重要課題の一つといえる。水処理の観点から、バイオ・ 化学系界面活性剤に代表される生化学製品を効率的に回収し、工業排水による環境負荷を低減することが重要であるが、回収効率は未だに不十分である。高効率界面活性剤分離技術を確立するには、界面活性剤を含む複雑混相流動に関する深い理解が必要である。本研究成果は上記の観点から学術的また社会的な意義を有している。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (17 results)

All 2023 2022 2021 Other

All Int'l Joint Research (8 results) Journal Article (4 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 4 results,  Open Access: 2 results) Presentation (3 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results) Remarks (2 results)

  • [Int'l Joint Research] Universite de Toulouse(フランス)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] Helmholtz-Zentrum Dresden- Rossendorf(ドイツ)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] Nottingham University(英国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] Universite de Toulouse(フランス)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] Helmholtz-Zentrum Dresden- Rossendorf(ドイツ)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] Eindhoven University of Technology(オランダ)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] Universite de Toulouse(フランス)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] Helmholtz-Zentrum Dresden-Rossendorf(ドイツ)

    • Related Report
      2020 Research-status Report
  • [Journal Article] Single Contaminated Drops Falling through Stagnant Liquid at Low Reynolds Numbers2022

    • Author(s)
      Hayashi Kosuke、Motoki Yuya、van der Linden Matheus J. A.、Deen Niels G.、Hosokawa Shigeo、Tomiyama Akio
    • Journal Title

      Fluids

      Volume: 7 Issue: 2 Pages: 55-55

    • DOI

      10.3390/fluids7020055

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] An ANN Correlation of Lift Coefficients of Bubbles in Linear Shear Flows2022

    • Author(s)
      K. Hayashi, J. Chen, R. Kurimoto, A. Tomiyama
    • Journal Title

      Multiphase Science and Technology

      Volume: - Issue: 2 Pages: 67-82

    • DOI

      10.1615/multscientechn.2022042904

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Critical Diameter for Lift Reversal of Bubbles in Linear Shear Flows2021

    • Author(s)
      K. Hayashi Kosuke, D. Lucas, D. Legendre, A. Tomiyama
    • Journal Title

      Multiphase Science and Technology

      Volume: 33 Issue: 2 Pages: 69-85

    • DOI

      10.1615/multscientechn.2021039246

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Scaling of Lift Reversal of Deformed Bubbles in Air-Water Systems2021

    • Author(s)
      K. Hayashi, H. Hessenkemper, D. Lucas, D. Legendre, A. Tomiyama
    • Journal Title

      International Journal of Multiphase Flow

      Volume: - Pages: 103653-103653

    • DOI

      10.1016/j.ijmultiphaseflow.2021.103653

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Lift Correlations of Ellipsoidal Bubbles in Low and High Viscosity Liquids2023

    • Author(s)
      Kosuke Hayashi
    • Organizer
      The 11th International Conference on Multiphase Flow
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 微細流路内汚染系テイラー流における気泡への界面活性剤吸着量に関する研究2023

    • Author(s)
      森匠,林公祐,栗本遼,冨山明男
    • Organizer
      混相流シンポジウム2023
    • Related Report
      2022 Annual Research Report
  • [Presentation] 汚染系単一球形液滴の数値計算に関する研究2021

    • Author(s)
      元木佑哉、林公祐、細川茂雄、冨山明男
    • Organizer
      日本流体力学会年会2021
    • Related Report
      2021 Research-status Report
  • [Remarks] Multiphase Fluid Dynamics Lab

    • URL

      https://www.lab.kobe-u.ac.jp/eng-mfd/index.html

    • Related Report
      2022 Annual Research Report
  • [Remarks] Multiphase Fluid Dynamics Lab

    • URL

      http://www.lab.kobe-u.ac.jp/eng-mfd/

    • Related Report
      2021 Research-status Report 2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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