2018 Fiscal Year Annual Research Report
Dynamics of microscale droplets impinging onto hot surfaces with oxide layers
| Project/Area Number |
18J11928
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| Research Institution | Kyushu University |
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Principal Investigator |
WANG Zhenying 九州大学, 工学府, 特別研究員(DC2)
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| Project Period (FY) |
2018-04-25 – 2020-03-31
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| Keywords | droplet dynamics / wetting and spreading / phase change |
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| Outline of Annual Research Achievements |
In the past year, I investigated the droplet dynamics along with phase change combining experimental and numerical studies. The experiments went on according to the original schedule,and the conclusions are published in Physical Chemistry Chemical Physics and International Journal of Heat and Mass Transfer. For better understanding the experimental phenomena, I went to the University of Edinburgh, and worked on numerical simulations by cooperating with Prof. Sefiane and Prof. Valluri. During the visiting, a lubrication-type model is established for the vapor absorption process into hygroscopic droplets.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
The experiments were conducted according to the planned schedule. Some interesting phenomena were observed which are of importance for further understanding the droplet behaviors during the vapor absorption process. Besides, the numerical model based on the lubrication theory offsets the vacancy of dynamic models for aqueous solution droplets along with phase change. The experimental results along with theoretical analyses have been published in two prestigious international journals. We are currently collecting and analyzing the simulation results. Relevant findings will be summarized and submitted in the near future.
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| Strategy for Future Research Activity |
In the next financial year, experiments will be carried out on the vapor desorption process from aqueous solution droplets. The experimental results will be a contrast with the simulation results, and will help to verify the mechanisms of droplet spreading as revealed by the numerical model. Moreover, further modifications of the model will be carried out to include the effect of surface hysteresis. The renewed results will be summarized along with the experimental results of vapor absorption. Beside, micro-PIV experiments will be conducted to reveal the interior flow within droplets undergoing vapor absorption and desorption.
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Research Products
(10 results)
