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Retraction dynamics of aqueous drops upon impact on non-wetting surfaces

Published online by Cambridge University Press:  02 December 2005

DENIS BARTOLO
Affiliation:
Laboratoire de Physique Statistique de l'ENS, 24 Rue Lhomond, 75231 Paris cedex 05, France
CHRISTOPHE JOSSERAND
Affiliation:
Laboratoire de Modélisation en Mécanique, CNRS-UMR 7606, Case 162, 4 place Jussieu, 75252 Paris Cédex 05, France
DANIEL BONN
Affiliation:
Laboratoire de Physique Statistique de l'ENS, 24 Rue Lhomond, 75231 Paris cedex 05, France van der Waals-Zeeman Institute, University of Amsterdam, Valckenierstraat 65, 1018 XE Amsterdam, The Netherlands

Abstract

We study the impact and subsequent retraction of liquid droplets upon high-speed impact on hydrophobic surfaces. Extensive experiments show that the drop retraction rate is a material constant and does not depend on the impact velocity. We show that on increasing the Ohnesorge number, $\Oh\,{=}\,\eta/\sqrt{\rho R_{\rm I} \gamma}$, the retraction, i.e. dewetting, dynamics crosses from a capillary-inertial regime to a capillary-viscous regime. We rationalize the experimental observations by a simple but robust semi-quantitative model for the solid-liquid contact line dynamics inspired by the standard theories for thin-film dewetting.

Type
Papers
Copyright
© 2005 Cambridge University Press

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