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

Jain, Utkarsh; Gauthier, Anaïs; Lohse, Detlef; van der Meer, Devaraj

doi:10.1103/PhysRevFluids.6.L042001

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

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Lohse, Detlef
Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Citation

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.

Cite as: https://hdl.handle.net/21.11116/0000-0008-AB81-5

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.