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.Q11.6
Abstract: Q11.00006 : Entrapment of microbubbles during drop impact onto a nano-rough solid surface*
1:55 PM–2:08 PM
Presenter:
Kenneth R. Langley
(King Abdullah Univ of Sci & Tech (KAUST))
Authors:
Kenneth R. Langley
(King Abdullah Univ of Sci & Tech (KAUST))
Er Qiang Li
(University of Science and Technology of China, King Abdullah Univ of Sci & Tech (KAUST))
Ivan U. Vakarelski
(King Abdullah Univ of Sci & Tech (KAUST))
Sigurdur T. Thoroddsen
(King Abdullah Univ of Sci & Tech (KAUST))
Drop impacts on solids are ubiquitous in natural and industrial processes. Air that is entrapped during the impact process can negatively impact the quality or effectiveness of coatings or processes. As a drop approaches a solid surface, the pressure in the intervening air layer becomes sufficient to deform the bottom of the drop entrapping a central disc of air upon impact, which has been well studied for smooth surfaces. We investigate the formation of a thick band of microbubbles that is formed surrounding the central air disc during drop impact onto microscope slides coated with a nano-particle based superhydrophobic coating (Rq ≈ 70-140 nm) using ultra-high-speed interferometry at rates up to 5 million fps. The effects of the size and structure of the nano-roughness on the central air disc and the mechanisms for the formation of the microbubbles will be presented. See Langley et al., Soft Matter, 2018, DOI: 10.1039/c8sm01070f
*This work was funded by King Abdullah Univ. of Sci. and Tech. (KAUST) under Grant No. URF/1/2621-01-01. E.Q. Li acknowledges the Thousand Young Talents Program of China, the National Natural Sci. Foundation of China (Grant No. 11772327, 11642018, & 11621202) and Fundamental Res. Funds for the Central Univ. (Grant No. WK2090050041).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.Q11.6
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