Depinning of three-dimensional drops from wettability defects

Details Depinning of three-dimensional drops from wettability defects Depinning of three-dimensional drops from wettability defects

2008-11-18

arxiv.org/abs/0811.2918v1

EPL 86 No 2 (April 2009) 24006

Physics

Fluid Dynamics

6 pages, 9 figures, submitted to epl

Scientific paper

Substrate defects crucially influence the onset of sliding drop motion under lateral driving. A finite force is necessary to overcome the pinning influence even of microscale heterogeneities. The depinning dynamics of three-dimensional drops is studied for hydrophilic and hydrophobic wettability defects using a long-wave evolution equation for the film thickness profile. It is found that the nature of the depinning transition explains the experimentally observed stick-slip motion.

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