# Dresden 2017 – wissenschaftliches Programm

## Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

# 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 *r*_{0} for a wide range of slip length *b* using the boundary element method. For *b*≪ *r*_{0}, the prediction of the critical velocity (*U*_{c}) of entrainment *Ca*_{c}≡η *U*_{c}/γ∼1/ln(*c* *r*_{0}/*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.