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On the elasticity of an inertial liquid shock

Published online by Cambridge University Press:  24 April 2006

ANNE-LAURE BIANCE
Affiliation:
Laboratoire de Physique de la Matière Condensée, FRE 2844 du CNRS, Collège de France 75231 Paris Cedex 05, France
FRÉDÉRIC CHEVY
Affiliation:
Laboratoire de Physique de la Matière Condensée, FRE 2844 du CNRS, Collège de France 75231 Paris Cedex 05, France
CHRISTOPHE CLANET
Affiliation:
Institut de Recherche sur les Phénomènes Hors Équilibre, UMR 6594 du CNRS BP 146, 13384 Marseille Cedex, France
GUILLAUME LAGUBEAU
Affiliation:
Institut de Recherche sur les Phénomènes Hors Équilibre, UMR 6594 du CNRS BP 146, 13384 Marseille Cedex, France
DAVID QUÉRÉ
Affiliation:
Laboratoire de Physique de la Matière Condensée, FRE 2844 du CNRS, Collège de France 75231 Paris Cedex 05, France

Abstract

A drop of low viscosity hitting a solid may bounce, provided that the material is highly hydrophobic. As a model of such a situation, we consider here the case of a very hot solid. Then, as discovered by Leidenfrost, a thin layer of vapour sustains the drop, preventing any contact with the substrate. On hitting such a solid, a drop rebounds, and we discuss here the elasticity of the shock. Two very different cases are described: at a large velocity, the weaker the impact velocity, the weaker the elasticity; at a small velocity, a quasi-elastic regime is found. The boundary between the two domains is set by a Weber number, which compares the kinetic and surface energies of the drop, of order unity.

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Papers
Copyright
© 2006 Cambridge University Press

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