Authors: C. Maier and E.P. Hofer
Affilation: University of Ulm, Germany
Pages: 258 - 261
Keywords: microfluidic systems, free surface flow, high-speed visualization, CFD code evaluation
Surface forces and capillary effects can play a dominant role in fluidic microsystems. Therefore it is crucial for simulations to use accurate numerical approaches . Furthermore experimental data gained from such surface dominated systems can be used to test different numerical methods for dealing with moving boundary problems. This paper presents the real-time visualization of collisions of water microdroplets on an inclined steal plate. This model experiment shows the features of wetting and dynamic contact angles. The frame of 8 images recorded with a multi channel high-speed camera coupled to an optical microscope is treated by specially developed digital image processing tools to correct geometrical distortions and to extract object features. The above mentioned experiment is compared to the simulation results obtained with a commercial code  which uses the VOF algorithm .