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Research on viscoelastic instability by measuring velocity and viscosity distribution with high spatial resolution

Research Project

Project/Area Number 22K14183
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 19010:Fluid engineering-related
Research InstitutionTokyo University of Science

Principal Investigator

Ichikawa Yoshiyasu  東京理科大学, 工学部機械工学科, 助教 (00825060)

Project Period (FY) 2022-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2022: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords粘弾性流体 / マイクロ流体 / 速度分布計測 / 粘度分布計測 / 蛍光分子ローター / マイクロピラーアレイ / 粒子画像流速計 / ソフトマター / 高分子溶液 / 粘度分布イメージング / 3次元3成分流速計測
Outline of Research at the Start

本研究では,せん断速度によって粘度が変化する粘弾性流体を対象とし,マイクロ流路中における不安定挙動へ遷移する際の3次元的な流動構造および粘度分布を,PIVやPTV,さらには粘度プローブを用いた精緻な蛍光輝度分布の取得など,光学的手法を駆使して計測し,流動補変化と遷移に至る起点の解明と定式化に取り組む.これにより,粘弾性流体の流動現象の理解や不安定挙動の予測に貢献する.

Outline of Final Research Achievements

This study aims to reveal the mechanism and origin of viscoelastic instability around the microstructures in the microchannels. In this study, we focused on the low-speed region formed around a micropillar array, and the velocity and viscosity distribution were measured by optical measurement techniques with high spatial resolution.
The velocity distribution obtained by PIV suggested that the formation mechanism of a low-speed region around a micropillar array depends on the solution's concentration. Moreover, it was indicated that the flow behavior of low-speed regions propagates to neighboring regions.
For viscosity measurement, we utilized the fluorescent molecular rotor which has the sensitivity for the viscosity, and the viscosity around the pillars in the viscoelastic flow was determined. Then, the efficiency of the devised technique was indicated.

Academic Significance and Societal Importance of the Research Achievements

粘弾性流体の流動が不安定な状態へと遷移するメカニズムは未だ不明であるが,応力緩和などの影響により微細構造周りに形成される低速度領域の流動について調べ上げ,その特徴について解明した.また,確立されていなかった粘度分布計測手法について,蛍光分子ローターを用いる方法の有効性について示すことができた.本研究で得られた知見は,石油増進回収から人工血管にいたるまで,身の回りの粘弾性流体の流動の計測や現象の解明,そしてその応用への可能性の一端を示すものである.

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • Research Products

    (8 results)

All 2023 2022 Other

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (6 results) (of which Int'l Joint Research: 2 results) Remarks (1 results)

  • [Journal Article] Viscoelastic flow behavior and formation of dead zone around triangle-shaped pillar array in microchannel2022

    • Author(s)
      Ichikawa Yoshiyasu、Motosuke Masahiro
    • Journal Title

      Microfluidics and Nanofluidics

      Volume: 26 Issue: 6 Pages: 44-44

    • DOI

      10.1007/s10404-022-02549-9

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Presentation] Visualization of polymer solution-flow behavior around triangle-shaped pillar array in microchannel2023

    • Author(s)
      Yoshiyasu Ichikawa, Masahiro Motosuke
    • Organizer
      20th International Symposium on Flow Visualization (ISFV20)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 蛍光分子ローターを使用した高分子溶液流れの粘度イメージング2023

    • Author(s)
      市川賀康, 楊俊英, 元祐昌廣
    • Organizer
      日本流体力学会年会2023
    • Related Report
      2023 Annual Research Report
  • [Presentation] ピラーアレイを有するマイクロ流路内における準希薄高分子溶液の流れ2022

    • Author(s)
      市川賀康,元祐昌廣
    • Organizer
      第50回可視化情報シンポジウム
    • Related Report
      2022 Research-status Report
  • [Presentation] マイクロ流路内の三角形ピラーアレイ周りにおける高分子溶液の挙動2022

    • Author(s)
      市川賀康,元祐昌廣
    • Organizer
      日本流体力学会年会2022
    • Related Report
      2022 Research-status Report
  • [Presentation] Shear banding flow behavior around the periodic triangle-shaped pillars in microchannel2022

    • Author(s)
      Yoshiyasu Ichikawa, Masahiro Motosuke
    • Organizer
      75th Annual Meeting of the American Physical Society Division of Fluid Dynamics (APSDFD2022)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 蛍光分子ローターを用いたマイクロ流路中の粘弾性流体の粘度計測2022

    • Author(s)
      市川賀康,楊俊英,山口玲輔,元祐昌廣
    • Organizer
      第18回学際領域における分子イメージングフォーラム
    • Related Report
      2022 Research-status Report
  • [Remarks] 元祐研究室HP

    • URL

      https://www.rs.tus.ac.jp/motlab/jp/index.html

    • Related Report
      2022 Research-status Report

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Published: 2022-04-19   Modified: 2025-01-30  

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