Dresden 2017 – wissenschaftliches Programm
CPP 49.13: Poster
Mittwoch, 22. März 2017, 18:30–21:00, P2-OG1
Slip effects on forced dewetting — •Tak Shing Chan, Martin Brinkmann, and Ralf Seemann — Experimental Physics, Saarland University, D-66041 Saarbrücken, Germany
Slippage of fluid over a solid surface is known to have a weak (logarithmic) effect in macroscopic dynamic wetting. In this contribution, we study the forced dewetting of a liquid of viscosity η confined in a cylindrical tube of radius r0 for a wide range of slip length b using the boundary element method. For b≪ r0, the prediction of the critical velocity (Uc) of entrainment Cac≡η Uc/γ∼1/ln(c r0/b) by classical dynamic wetting models is recovered. Here γ is the surface tension of liquid/air interface and c an undetermined prefactor. When increasing the slip length, we demonstrate a crossover from the logarithmic relation to a regime where Cac scales linearly with b for large b. In this regime, the energy input to the system is mainly dissipated by the friction at the solid/ liquid boundary. Our finding connects the dynamical wetting phenomena in macroscopic systems and small-scaled fluidic systems.