Berlin 2008 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 26: Fluid dynamics II

DY 26.9: Vortrag

Donnerstag, 28. Februar 2008, 16:15–16:30, MA 001

Drying of substrates covered by thin liquid films — •Rodica Borcia and Michael Bestehorn — Lehrstuhl Statistische Physik/ Nichtlineare Dynamik, Brandenburgische Technische Universität Cottbus, Erich-Weinert-Strasse 1, 03046, Cottbus, Germany

Composite systems of two or more phases like two immiscible fluids or an open fluid with its own vapor can be described using an additional variable – named phase field. This field contains information about the local state of the composition and permits to distinguish between different phases. With the help of the phase field variable all system parameters can be expressed as functions varying continuously from one medium to another. Therefore, the problem is treated like an entire one phase problem and the interface conditions will be substituted by some extra-terms in the Navier-Stokes equation.

Simple, flexible and elegant, the phase field model becomes now an useful tool for describing wetting and drying phenomena, processes with large applications for treatments involving paints, insecticides, detergents, composite materials, and porous media. We investigate using a phase field model the stability of liquid films on a flat solid support with variable wettability, transition via nucleation from film to drop, drops motion on an inclined substrate under gravity effects and viscous flow over chemically patterned surfaces.