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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 49: Poster: Surfaces, Interfaces, Thin Films, Nanostructures

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 (U_c) of entrainment Ca_c≡η U_c/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 Ca_c 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.