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Bouncing drop on liquid film: Dynamics of interfacial gas layer

Author(s): Tang, X; Saha, A; Law, Chung K; Sun, C

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Abstract: The transition between merging and bouncing outcomes for a drop impacting on a liquid film is critically controlled by the resistance from the microscopic interfacial gas layer trapped between the interacting and deformable drop and film surfaces. Using high-speed imaging and color interferometry, we have quantified and analyzed the gas layer dynamics during bouncing when the liquid film thickness is comparable to the drop radius. Results show that the gas layer morphology changes dramatically and non-monotonically with the film thickness and that in addition to the centrally located dimple previously observed for impact on thin films, a new, rim-dimple morphology is observed for larger film thicknesses. The effects of capillarity of the drop and film are also delineated by increasing the liquid viscosity and hence damping the respective surface waves.
Publication Date: 2019
Citation: Tang, X, Saha, A, Law, CK, Sun, C. (2019). Bouncing drop on liquid film: Dynamics of interfacial gas layer. Physics of Fluids, 31 (10.1063/1.5063257
DOI: doi:10.1063/1.5063257
Type of Material: Journal Article
Journal/Proceeding Title: Physics of Fluids
Version: Final published version. This is an open access article.

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