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Development of a water purification device for space residence using droplets that are self-driven by a surface tension gradient

Research Project

Project/Area Number 19K22015
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 24:Aerospace engineering, marine and maritime engineering, and related fields
Research InstitutionOsaka University

Principal Investigator

Okano Yasunori  大阪大学, 基礎工学研究科, 教授 (90204007)

Co-Investigator(Kenkyū-buntansha) 稲富 裕光  国立研究開発法人宇宙航空研究開発機構, 宇宙科学研究所, 教授 (50249934)
堀河 俊英  徳島大学, 大学院社会産業理工学研究部(理工学域), 准教授 (90380112)
Project Period (FY) 2019-06-28 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2020: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2019: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywordsマランゴニ対流 / 宇宙居住 / 数値解析 / 水浄化 / 移動速度論 / マランゴニ / 自己駆動液滴
Outline of Research at the Start

本研究では、以下の基本方針に基づき、マイクロプロセスを提案する。
・蒸留という比重差を用いる分離法を、表面張力差流れを利用した分離(蒸留)に置き換える。
・宇宙までの輸送コストと宇宙空間の使用できる空間を考慮すると蒸留塔などの大規模装置
の建造は困難なため、ラシヒリング間の流動をマイクロプロセスで置き換える。
・宇宙環境を利用する機会は極めて限られているため、計算機シミュレーションを活用する。

Outline of Final Research Achievements

For the purpose of realizing space residence, we devised a water purification system using self-driven droplets. As the basic research, numerical analysis was used to elucidate the fluid flow when the interfacial tension gradient caused by the concentration difference and the temperature difference coexist. It was found that even if the driving force caused by the concentration difference and the temperature difference is in the same direction or in the opposite direction, the resulting flow cannot be expressed simply by the sum or difference between the them, and exhibits extremely complicated behavior. In addition, the effect of the substrate on the conventional droplet behavior in the liquid was remarkable, and the moving speed was reduced. In addition to this, it was found that the flow phenomenon in the liquid can be controlled by radiative heat transfer control by changing the ambient temperature.

Academic Significance and Societal Importance of the Research Achievements

通常の現象においては温度差と濃度差が共存することが多いが、これまではどちらか一方のみを扱うことがほとんどであった。この両者を同時に考慮することにより新しい現象の発見とそれに伴う新しい制御法の提言が可能となった点に学術的な意義がある。また本法を拡大適用することにより、宇宙環境において従来法に比べ駆動エネルギーが極めて小さい流体輸送システムの構築が可能となり、人類の長年の夢である宇宙居住が実現しうる点に社会的意義がある。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (16 results)

All 2021 2020 2019 Other

All Int'l Joint Research (2 results) Journal Article (6 results) (of which Int'l Joint Research: 6 results,  Peer Reviewed: 6 results,  Open Access: 3 results) Presentation (8 results)

  • [Int'l Joint Research] University of Victoria(カナダ)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] ヴィクトリア大学(カナダ)

    • Related Report
      2020 Research-status Report
  • [Journal Article] A Numerical Study on the Exact Onset of Flow Instabilities in Thermo-Solutal Marangoni Convection Driven by Opposing Forces in a Half-Zone Liquid Bridge under Zero Gravity2021

    • Author(s)
      Laknath Radeesha、Mendis Agampodi、Sekimoto Atsushi、Okano Yasunori、Minakuchi Hisashi、Dost Sadik
    • Journal Title

      JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

      Volume: 54 Issue: 8 Pages: 424-430

    • DOI

      10.1252/jcej.21we041

    • NAID

      130008076501

    • ISSN
      0021-9592, 1881-1299
    • Year and Date
      2021-08-20
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Effect of radiative heat transfer on thermal-solutal Marangoni convection in a shallow rectangular cavity with mutually perpendicular temperature and concentration gradients2021

    • Author(s)
      Jiangao Zhang, Yasunori Okano and Sadik Dost,
    • Journal Title

      Int.J.Heat Mass Transfer

      Volume: -

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Numerical simulation of Marangoni convection in a shallow rectangular cavity with a linear solutal boundary condition2021

    • Author(s)
      Jiangao Zhang, Yasunori Okano and Sadik Dost,
    • Journal Title

      Int.J.Heat Mass Transfer

      Volume: -

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] The Relative Contribution of Solutal Marangoni Convection to Thermal Marangoni Flow Instabilities in a Liquid Bridge of Smaller Aspect Ratios under Zero Gravity2021

    • Author(s)
      Agampodi Mendis Radeesha Laknath、Sekimoto Atsushi、Okano Yasunori、Minakuchi Hisashi、Dost Sadik
    • Journal Title

      Crystals

      Volume: 11 Issue: 2 Pages: 116-116

    • DOI

      10.3390/cryst11020116

    • NAID

      120007019281

    • Related Report
      2021 Annual Research Report 2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Global Linear Stability Analysis of Thermo-solutal Marangoni Convection in a Liquid Bridge Under Zero Gravity2020

    • Author(s)
      Radeesha Laknath Agampodi Mendis, Atsushi Sekimoto, Yasunori Okano, Hisashi Minakuchi & Sadik Dost
    • Journal Title

      Microgravity Science and Technology

      Volume: 32 Issue: 4 Pages: 729-735

    • DOI

      10.1007/s12217-020-09798-9

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Marangoni flows of opposite directions developing in a cylindrical liquid bridge under zero gravity2020

    • Author(s)
      Chihao Jin, Atsushi Sekimoto , Yasunori Okano, Hisashi Minakuchi, and Sadik Dost
    • Journal Title

      Phys. Fluids

      Volume: 32 Issue: 3 Pages: 1-12

    • DOI

      10.1063/1.5142071

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Numerical simulation of thermal-solutal Marangoni convection in a shallow rectangular cavity with the effect of radiative heat transfer under zero gravity2021

    • Author(s)
      Jiangao Zhang, Yasunori Okano
    • Organizer
      日本マイクログラビティ応用学会 第33回学術講演会 (JASMAC-33)
    • Related Report
      2021 Annual Research Report
  • [Presentation] Numerical simulation of thermal and solutal Marangoni convection in a half floating zone with radiation effects under zero gravity2021

    • Author(s)
      Chihao Jin et al.
    • Organizer
      日本マイクログラビティ応用学会 第33回学術講演会 (JASMAC-33)
    • Related Report
      2021 Annual Research Report
  • [Presentation] Numerical Simulation of Thermal and Solutal Marangoni Convection in a Full Floating Zone with Radiative Heat Transfer under Zero Gravity2020

    • Author(s)
      Chihao JIN, Atsushi SEKIMOTO, Yasunori OKANO, Hisashi MINAKUCHI
    • Organizer
      日本マイクログラビティ応用学会 第32回学術講演会 (JASMAC-32)
    • Related Report
      2020 Research-status Report
  • [Presentation] Numerical Simulation of Thermal-solutal Marangoni Convection in a Shallow Rectangular Cavity with Mutually Perpendicular Temperature and Concentration Gradients2020

    • Author(s)
      Jiangao ZHANG, Atsushi SEKIMOTO, Yasunori OKANO
    • Organizer
      日本マイクログラビティ応用学会 第32回学術講演会 (JASMAC-32)
    • Related Report
      2020 Research-status Report
  • [Presentation] Global Linear Stability Analysis of Thermo-solutal Marangoni Convection with the Opposing Forces under Microgravity Conditions2020

    • Author(s)
      Radeesha laknath AGAMPODI MENDIS, Atsushi SEKIMOTO, Yasunori OKANO, Hisashi MINAKUCHI
    • Organizer
      日本マイクログラビティ応用学会 第32回学術講演会 (JASMAC-32)
    • Related Report
      2020 Research-status Report
  • [Presentation] 宇宙居住用水浄化装置の開発を目指したマランゴニ効果による単一液滴移動の数値解析2019

    • Author(s)
      廣川 雄也、関本 敦、岡野 泰則
    • Organizer
      化学工学会 姫路大会2019
    • Related Report
      2019 Research-status Report
  • [Presentation] Numerical Simulation of the Opposite Thermal and Solutal Marangoni Convections in a Liquid Bridge2019

    • Author(s)
      Chihao JIN,Atsushi SEKIMOTO,Yasunori OKANO, Hisashi MINAKUCHI
    • Organizer
      第31回日本マイクログラビティ応用学会
    • Related Report
      2019 Research-status Report
  • [Presentation] Global Linear Stability Analysis of Marangoni Convection Under Microgravity Conditions2019

    • Author(s)
      Radeesha Laknath AGAMPODI MENDIS,Atsushi SEKIMOTO, Yasunori OKANO,Hisashi MINAKUCHI
    • Organizer
      第31回日本マイクログラビティ応用学会
    • Related Report
      2019 Research-status Report

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Published: 2019-07-04   Modified: 2023-01-30  

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