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Berlin 2018 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 17: Focus: Droplets (joint session DY/CPP)

DY 17.11: Vortrag

Montag, 12. März 2018, 18:15–18:30, BH-N 334

Morphological evolution of microscopic dewetting droplets with slipTak S. Chan1, Joshua D. McGraw1,2, Thomas Salez3, Ralf Seemann1, and •Martin Brinkmann11Experimental Physics, D-66123 Saarland University — 2Département de Physique, Ecole Normale Supérieure/PSL Research University, CNRS, 24 rue Lhomond, 75005 Paris, France — 3Laboratoire de Physico-Chimie Théorique, UMR CNRS Gulliver 7083, ESPCI Paris, PSL Research University, Paris, France

A liquid drop sitting on a smooth substrate will contract or spread depending on the equilibrium contact angle and the initial shape of the drop. One well known example is that of drops spreading over a completely wetting surface, which follow Tanner’s law. In this study, we numerically compute the dynamics of contracting microscopic droplets where the slip-length b on the substrate is comparable to the intial drop height H. As quantified by the asphericity of the drop shape, we find a cross-over between two different dynamic regimes at slip length bH and bH. These findings are explained from a competition between viscous dissipation in elongational flows for bH, friction at the substrate for bH, and viscous dissipation in shear flows for bH. Following the changes between the dominant dissipation mechanisms, our study not only indicates two universal rescalings of the evolution of asphericity, but also a cross–over to the quasi-static shape evolution when b is many orders of magnitude smaller than the slip length bm where the asphericity assume its maximum value.

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