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Morphology Scaling of Drop Impact onto a Granular Layer

Hiroaki Katsuragi
Phys. Rev. Lett. 104, 218001 – Published 28 May 2010
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Abstract

We investigate the impact of a free-falling water drop onto a granular layer. First, we constructed a phase diagram of crater shapes with two control parameters, impact speed and grain size. A low-speed impact makes a deeper cylindrical crater in a fluffy granular target. After high-speed impacts, we observed a convex bump higher than the initial surface level instead of a crater. The inner ring can be also observed in a medium impact speed regime. Quantitatively, we found a scaling law for a crater radius with a dimensionless number consisting of impact speed and density ratio between the bulk granular layer and water drop. This scaling demonstrates that the water drop deformation is crucial to understanding the crater morphology.

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  • Received 7 February 2010

DOI:https://doi.org/10.1103/PhysRevLett.104.218001

©2010 American Physical Society

Authors & Affiliations

Hiroaki Katsuragi

  • Department of Applied Science for Electronics and Materials, Kyushu University, 6-1 Kasugakoen, Kasuga, Fukuoka 816-8580, Japan

See Also

Liquids Make Craters, Too

JR Minkel
Phys. Rev. Focus 25, 20 (2010)

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Issue

Vol. 104, Iss. 21 — 28 May 2010

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