Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 37: Poster Session 2
CPP 37.15: Poster
Mittwoch, 2. April 2014, 15:00–19:00, P3
Study of contact lines moving over heterogeneous surfaces — •Tak Shing Chan1,2, Daniel Herde2, and Martin Brinkmann1,2 — 1Universität des Saarlandes, Saarbrücken, Germany — 2Max Planck Institute for Dynamic and Self-Organization, Göttingen, Germany
We study problems of contact lines moving over heterogeneous surfaces using a lubrication model that incorporates dynamics on many length scales from several nanometers, where hydrodynamic slip plays a significant role, to the size of a system with typical dimensions of a few millimeters. We first consider the problem of a time dependent, oscillating microscopic contact angle and derive the essential relation between the amplitudes of the contact line displacement and the amplitude and oscillation frequency of the microscopic contact angle. We also investigate the problem in which a liquid front is driven by external forces to move over a surface with alternating stripes of different wettability on a plane substrate.