2023 Fiscal Year Final Research Report
Scale effects on electrohydrodynamic conduction pumping
| Project/Area Number |
21K14075
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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 | Toyohashi University of Technology |
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Principal Investigator |
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 電気流体力学 / 絶縁性液体 / ポンプ / 機能性流体 / 高電圧工学 / 解離電荷 |
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| Outline of Final Research Achievements |
The purpose of this study is to elucidate scale effects on electrohydrodynamic (EHD) conduction pumps which operate without mechanical moving parts. Pump characteristics and heterocharge layer shapes at the micrometer scale were investigated both experimentally and numerically. It was found that the heterocharge layer, which consists of dissociated ions formed near the electrode of opposite polarity, becomes relatively larger as the scale decreases. It was found that as the scale decreases, the two heterocharge layers overlap and the Coulomb forces cancel each other out. Furthermore, it was found for the first time that the asymmetry of the positive and negative heterocharge layers is lost as the scale decreases.
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| Free Research Field |
エネルギー熱流体工学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究により、数十マイクロメートル以下のスケールにおいては従来のように電極を非対称性に設計しても流動の源である正味のクーロン力は流れ方向に発生しにくくなることが分かった．すなわち小さなスケールではそのような現象を考慮した設計が必要であるということが本研究で分かった重要な成果である．EHDポンプの最大印加電圧は液体の絶縁破壊電圧で決まり，絶縁破壊電界（印加電圧/電極間距離）はおおよそ10 kV/mm以下である．マイクロEHDポンプでは電極間距離が短いため印加電圧は数～数百Vまで低くすることができ運用がより容易になり応用の幅が広がると考えられる．本研究ではその設計における基礎的な知見を獲得した．
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