| Project/Area Number |
21K14097
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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 19020:Thermal engineering-related
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| Research Institution | Kyushu University |
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Principal Investigator |
王 振英 九州大学, 工学研究院, 助教 (20896633)
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| Project Period (FY) |
2022-02-01 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2022: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2021: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Keywords | three phase contact line / flow pattern / droplet / capillary / Marangoni flow / interfacial mass flux / wetting dynamics / droplet evaporation / capillary force / Three phase contact line / Nanostructure / Atomic Force Microscope / Precursor film / Wetting and spreading |
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| Outline of Research at the Start |
The project aims to realize high-resolution observation of three phase contact line with relative motion taking place at the liquid-solid interface. The spatiotemporal evolution detected by AFM will be numerically fitted with Direct Numerical Simulation (DNS) based on the precursor film theory.
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| Outline of Annual Research Achievements |
Continuous investigations are carried out on the flow structure and spreading dynamics of three phase contact line (TPCL) with full consideration of thermophysical properties across phases. Specifically, I formulate an efficient mathematical model for capturing the dominating physics, and apply trajectory analysis and infrared thermography to reveal the transition of internal flow and temperature distribution. A phase diagram is derived to describe the transition of flow state due to the competition of Marangoni flow, capillary flow, and evaporation flux, which in cases leads to the formation of stagnation point near TPCL. The spatiotemporal variations of capillary and Marangoni velocity are further quantified by mathematically decomposing the tangential velocity of interfacial flow.
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