Dresden 2006 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 20: SYMPOSIUM Microfluidics I: Boundary conditions, manipulation, and transport
CPP 20.1: Hauptvortrag
Donnerstag, 30. März 2006, 09:30–10:00, ZEU 160
Interplay of slip and viscoelasticity in dewetting of thin liquid films — •Markus Rauscher1,2, Andreas Münch3, Barbara Wagner4, and Ralf Blossey5 — 1Max-Planck-Institut für Metallforschung, Heisenbergstr. 3, 70569 Stuttgart — 2Institut für Theoretische und Angewandte Physik, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart — 3Institut für Mathematik, Humboldt Universität Berlin, 10099 Berlin — 4Weierstrass Institut für Angewandte Analysis und Stochastik, Mohrenstr. 39, 10117 Berlin — 5Interdisciplinary Research Institute, c/o IEMN Avenue Poincaré BP 60069, F-59652 Villeneuve d Ascq, France
The dynamics of dewetting thin liquid films and the resulting film morphologies have been topic of intense research and great progress (experimental and theoretical) has been made. In particular the influence of the interplay between the rheology of the liquid and the slip at the liquid-substrate interface on the shape of dewetting fronts has been discussed in great detail.
We discuss the dewetting dynamics of thin slipping viscoelastic and Newtonian films in hydrodynamic thin film models based on generalized Maxwell or Jeffreys models. Depending on the ratio of slip length to film thickness one obtains different slip regimes and different thin film models. For weak slip with slip lengths smaller than the film thickness our model predicts dewetting fronts which decay towards the resting film in an oscillatory fashion, independent of the rheological properties of the fluid. But strong slip can lead to monotonically decaying fronts even for Newtonian fluids, as confirmed by recent experiments.