Berlin 2012 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 21: Poster: Wetting, Micro and nanofluidics

CPP 21.23: Poster

Wednesday, March 28, 2012, 11:00–13:00, Poster A

Dynamic Contact Angles on Heterogeneous Substrates — •Daniel Herde, Stephan Herminghaus, and Martin Brinkmann — MPI for Dynamics and Self-Organisation, Goettingen, Germany

We study the influence of heterogeneities in the substrate wetting energy on the dynamical contact angle for a driven contact line. To this end, we model a 2-dimensional droplet sheared between two substrates in the Steady Stokes limit using boundary element methods.

Different definitions of the dynamic contact angle are compared. The constitutive velocity-contact angle relations for the case of driving with constant force and driving with constant velocity are discussed. Together with the information about the energy input in the system and the energy stored in the configuration of the free interface, we can characterise the influence of the heterogeneity on the energy dissipation in the system.