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).

This content is only available via PDF.
You do not currently have access to this content.