This study is concerned with the numerical simulation of a drop moving on a surface due to a wettability gradient. The wettability gradient is introduced by varying the static contact angle along the surface. The unsteady laminar Navier-Stokes equation is solved in each phase using a fixed Eulerian unstructured grid. The Volume of Fluid Model (VOF) is used to account for tracking the gas/liquid interface. A water drop was placed on a solid surface with a linear contact angle distribution, and the simulation results for the drop velocity were compared with the analytical results of Brochard (1989).
Drop Motion Simulation on a Surface Due to a Wettability Gradient
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Nasr, H, Ahmadi, G, McLaughlin, JB, & Jia, X. "Drop Motion Simulation on a Surface Due to a Wettability Gradient." Proceedings of the ASME 2006 2nd Joint U.S.-European Fluids Engineering Summer Meeting Collocated With the 14th International Conference on Nuclear Engineering. Volume 2: Fora. Miami, Florida, USA. July 17–20, 2006. pp. 547-550. ASME. https://doi.org/10.1115/FEDSM2006-98176
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