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DY: Fachverband Dynamik und Statistische Physik

DY 11: Wetting, Fluidics and Liquids at Interfaces and Surfaces II (joint session CPP/DY)

DY 11.4: Talk

Monday, March 17, 2025, 18:15–18:30, H34

Soft dynamic wetting transition — •Christopher Henkel¹, Vincent Bertin², Jacco Snoeijer², and Uwe Thiele^1,3 — 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