2023 Fiscal Year Final Research Report
Research on viscoelastic instability by measuring velocity and viscosity distribution with high spatial resolution
| Project/Area Number |
22K14183
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 19010:Fluid engineering-related
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| Research Institution | Tokyo University of Science |
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Principal Investigator |
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| Project Period (FY) |
2022-04-01 – 2024-03-31
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| 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 |
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| 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.
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| Free Research Field |
流体工学
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| 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．
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