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

  • DENIS BARTOLO (a1), CHRISTOPHE JOSSERAND (a2) and DANIEL BONN (a1) (a3)

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.

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

  • DENIS BARTOLO (a1), CHRISTOPHE JOSSERAND (a2) and DANIEL BONN (a1) (a3)

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