Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session Q11: Drop Impact on Solids II
12:50 PM–3:26 PM,
Tuesday, November 20, 2018
Georgia World Congress Center Room: B216
Chair: Xiang Cheng, University of Minnesota, Twin Cities
Abstract ID: BAPS.2018.DFD.Q11.2
Abstract: Q11.00002 : Impact of liquid droplets on heated surfaces*
1:03 PM–1:16 PM
The phenomenon of droplet impact on heated surface happens ubiquitously in nature and in a wide range of industrial applications which include but are not limited to spray cooling and fuel-spray impingement in internal combustion engines. The impact process could be significantly affected by the heat transfer or phase change. We experimentally study the impact dynamics by high-speed imaging using liquids with different viscosities within wide ranges of Weber number and substrate temperature. We identify a mode of droplet bouncing (bouncing-with-spray mode) that can reduce the residence time significantly compared with the traditional retraction-bouncing mode. A scaling law is proposed for the transition boundary between the retraction-bouncing mode and the bouncing-with-spray mode. This study not only provides physical insight into the mechanism of the impact dynamics, but also can be helpful in the optimization of this process in the relevant applications.
*This work is supported by the National Natural Science Foundation of China (Grant No. 51676137), the Natural Science Foundation of Tianjin City (Grant No. 16JCYBJC41100), and the National Natural Science Funds for Distinguished Young Scholar (No. 51525603).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.Q11.2
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