Drops on an inclined heterogeneous substrate: onset of sliding motion

Abstract

Pinning and depinning of drops on an inclined heterogeneous substrate is studied as a function of the inclination and heterogeneity amplitude. Two types of heterogeneity are considered: a hydrophobic defect that blocks the droplet in front, and a hydrophilic one that holds it at the back. Two different types of depinning leading to sliding motion are identified, and the resulting stick-slip motion is studied numerically.

4 pages, 5 figures

References in corpus (2)

• Long-wave theory of bounded two-layer films with a free liquid-liquid interface: Short- and long-time evolution
• Self-propelled running droplets on solid substrates driven by chemical reactions

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