Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 36: Wetting, Micro and nanofluidics I
CPP 36.13: Vortrag
Donnerstag, 29. März 2012, 18:30–18:45, C 264
Wetting of droplet ensembles on solid substrates — •Marouen Ben Said1,2, Britta Nestler1,2, Harald Garcke3, and Michael Selzer1,2 — 1Institute of Materials and Processes, University of Applied Sciences, Karlsruhe, Germany — 2Institute of Applied Materials, Karlsruhe Institute of Technology, Karlsruhe, Germany — 3Faculty of Mathematics, University of Regensburg, Regensburg, Germany
We present a phase field model for multi-phase systems with preserved volume fractions and an accurate boundary condition to simulate wetting behaviors of droplet ensembles on solid substrates. The formulation of the boundary condition at the substrate surface ensures the correct macroscopic contact angles according to Young’s law. The approach is related to the minimization of free energy of the system. Furthermore, we use the energy formulation proposed by Nestler et al. [1] with an additional substrate energy term describing the interactions between the solid- and the different liquid phases. We show 2D and 3D simulations of liquid droplet ensembles on flat and structured solid walls and discuss the results.
[1] Britta Nestler, Frank Wendler, Michael Selzer, Björn Stinner, and Harald Garcke. Phase field model for multi-phase systems with preserved volume fractions. Phys. Rev. E, 78(1):011604, Jul 2008.