Berlin 2008 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 26: Fluid dynamics II

DY 26.11: Talk

Thursday, February 28, 2008, 16:45–17:00, MA 001

Binary mixture thin film in vertical and horizontal temperature gradients — •Ion Dan Borcia and Michael Bestehorn — Lehrstuhl für Theoretische Physik II, Brandenburgische Technische Universität Cottbus, Germany

Models for thin film binary mixture were developed using lubrication approximation with the surface tension depending on both temperature and concentration. A 2D simplified equation for the concentration (mass conservation equation) was added. The big advantage of these models is that the dimension of the problem is reduced by 1 and therefore the computing time considerably decreases. But this kind of models can not take into account horizontal temperature gradients on the solid substrate. In this case a complete model which includes the 3D energy and concentration equations will be used.

In the first step we didn’t include the evaporation in the model. In the case of the drying processes in polymers this corresponds to the situation when the film pattern formation is complete before the fast evaporation takes place.