2020 Fiscal Year Final Research Report
Direct measurement of pressure and shear stress distribution on the contact area of a droplet impacting a solid surface
Project/Area Number |
17H04903
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Research Category |
Grant-in-Aid for Young Scientists (A)
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Allocation Type | Single-year Grants |
Research Field |
Fluid engineering
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Research Institution | National Institute of Advanced Industrial Science and Technology (2019-2020) The University of Tokyo (2017-2018) |
Principal Investigator |
Nguyen Thanh-Vinh 国立研究開発法人産業技術総合研究所, エレクトロニクス・製造領域, 研究員 (20773427)
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Project Period (FY) |
2017-04-01 – 2021-03-31
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Keywords | 液滴 / 衝突 / 超撥水 / 圧力分布 / MEMS / 力センサ |
Outline of Final Research Achievements |
In this study, we have developed a method to directly measure the pressure distribution at the contact area of a droplet impacting a solid surface using a MEMS piezoresistive cantilever array. From the measurement results, the effects of the impact velocity and the droplet size on the maximum pressure at the contact area in the impact are clarified. It is also shown that the proposed sensor signal can be used to detect bubble entrapment and estimate the bubble size during droplet impact. We also measured the impact of droplets with a superhydrophobic blade and droplet merging. From the measurement results of droplet merging, it is shown that the viscosity and surface tension of the droplet can be estimated from the sensor output.
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Free Research Field |
流体計測
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Academic Significance and Societal Importance of the Research Achievements |
本研究の成果により、液滴衝突における接触面の力分布が定量的に明らかになり、従来の理論モデル及び数値解析の結果を検証できるので、液滴衝突のメカニズムの解明に貢献できたといえる。また、計測結果から液滴衝突におけるバブルの発生の検知方法及びバブル発生防止の手法が確立され、インクジェットプリンティングや液滴パターニング等の分野への応用が期待できる。
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