2005/09/15 by Denis Bartolo, Christophe Josserand, Daniel Bonn · 1 citation
Physics and Astronomy · #physics.flu-dyn
paper · pdf · doi:10.1017/s0022112005007184
arxiv created 2005/09/15 · arxiv updated 2009/12/01
We study the impact and subsequent retraction dynamics of liquid droplets upon high-speed impact on hydrophobic surfaces. Performing extensive experiments, we show that the drop retraction rate is a material constant and does not depend on the impact velocity. We show that when increasing the Ohnesorge number, \Oh=η/√ρR\rm I γ, the retraction, i.e. dewetting, dynamics crosses over from a capillaro-inertial regime to a capillaro-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.