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  Air-cushioning effect and Kelvin-Helmholtz instability before the slamming of a disk on water

Jain, U., Gauthier, A., Lohse, D., & van der Meer, D. (2021). Air-cushioning effect and Kelvin-Helmholtz instability before the slamming of a disk on water. Physical Review Fluids, 6: L042001. doi:10.1103/PhysRevFluids.6.L042001.

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Genre: Journal Article

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 Creators:
Jain, Utkarsh, Author
Gauthier, Anaïs, Author
Lohse, Detlef1, Author              
van der Meer, Devaraj, Author
Affiliations:
1Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063285              

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 Abstract: The macroscopic dynamics of a droplet impacting a solid is crucially determined by the intricate air dynamics occurring at the vanishingly small length scale between droplet and substrate prior to direct contact. Here we investigate the inverse problem, namely, the role of air for the impact of a horizontal flat disk onto a liquid surface, and find an equally significant effect. Using an in-house experimental technique, we measure the free surface deflections just before impact, with a precision of a few micrometers. Whereas stagnation pressure pushes down the surface in the center, we observe a liftup under the edge of the disk, which sets in at a later stage, and which we show to be consistent with a Kelvin-Helmholtz instability of the water-air interface.

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Language(s): eng - English
 Dates: 2021-04-292021
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1103/PhysRevFluids.6.L042001
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Title: Physical Review Fluids
Source Genre: Journal
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Pages: 9 Volume / Issue: 6 Sequence Number: L042001 Start / End Page: - Identifier: ISSN: 2469-990X