We have detected unique hydrodynamic topology in thin air film surrounding the central air dimple formed during drop impact on an immiscible liquid pool. The pattern resembles spinodal and finger-like structures typically found in various thin condensed matter systems. However, similar structures in thin entrapped gas films during drop impacts on solids or liquids have not been reported to date. The thickness profile and the associated dewetting dynamics in the entrapped air layer are investigated experimentally and theoretically using high-speed reflection interferometric imaging and linear stability analysis. We attribute the formation of multi-scale thickness perturbations, associated ruptures, and finger-like protrusions in the draining air film as a combined artifact of thin-film and Saffman–Taylor instabilities. The characteristic length scales depend on the air layer dimensions, the ratio of the liquid pool to droplet viscosity, and the air–water to air–oil surface tension.
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May 2022
Research Article|
May 09 2022
Droplet impact on immiscible liquid pool: Multi-scale dynamics of entrapped air cushion at short timescales
Durbar Roy;
Durbar Roy
Department of Mechanical Engineering, Indian Institute of Science
, Bengaluru, Karnataka 560012, India
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Sophia M;
Sophia M
Department of Mechanical Engineering, Indian Institute of Science
, Bengaluru, Karnataka 560012, India
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Srinivas S. Rao;
Srinivas S. Rao
Department of Mechanical Engineering, Indian Institute of Science
, Bengaluru, Karnataka 560012, India
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Saptarshi Basu
Saptarshi Basu
a)
Department of Mechanical Engineering, Indian Institute of Science
, Bengaluru, Karnataka 560012, India
a)Author to whom correspondence should be addressed: [email protected]
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a)Author to whom correspondence should be addressed: [email protected]
Physics of Fluids 34, 052004 (2022)
Article history
Received:
March 16 2022
Accepted:
April 25 2022
Citation
Durbar Roy, Sophia M, Srinivas S. Rao, Saptarshi Basu; Droplet impact on immiscible liquid pool: Multi-scale dynamics of entrapped air cushion at short timescales. Physics of Fluids 1 May 2022; 34 (5): 052004. https://doi.org/10.1063/5.0091584
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