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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 14: Wetting, Fluidics and Liquids at Interfaces and Surfaces II (joint session CPP/DY)
CPP 14.4: Vortrag
Montag, 17. März 2025, 18:15–18:30, H34
Soft dynamic wetting transition — •Christopher Henkel1, Vincent Bertin2, Jacco Snoeijer2, and Uwe Thiele1,3 — 1Institut für Theoretische Physik, Universität Münster, Germany — 2Physics of Fluids Group, Faculty of Science and Technology, Mesa+ Institute, University of Twente, The Netherlands — 3Center for Nonlinear Science (CeNoS), Universität Münster, Germany
We investigate the forced receding and advancing dynamics of a three-phase contact line on a viscoelastic substrate, i.e., the wetting transition of a substrate from macroscopically dry to wet or vice versa. Thereby, we use the Landau-Levich (or dip-coating) geometry, where a solid viscoelastic plate is dragged out of or pushed into a liquid bath. We employ a mesoscopic hydrodynamic model in long-wave approximation, i.e. valid at small contact angle and plate inclination. The elastic response of the substrate follows the Winkler foundation with a Kelvin-Voigt relaxation. In particular, we investigate how the shape and stability of the meniscus changes with the plate velocity and the substrate softness. In this we compare numeric results with asymptotic analytic calculations. Finally, we explore whether the occurrence of stick-slip motion in the advancing case can be predicted, using simple scaling arguments.
Keywords: soft wetting; elasticity; stick-slip; asymptotics