Kinetics of wetting has been explored where the contact line not only sees a steady spreading but also has longitudinal or transverse oscillations imposed on it. The latter case is realized when spreading takes place over a rough surface. The effects of the imposed motion are small, which seem to be due to low spreading rates and small dynamic contact angles used in this study. However, a singularity is seen in viscous dissipation during the movement on the model rough surface, which is interpreted here as an instability that is similar to Haines' jumps and stick-slip phenomena, with possible entrainment of the displaced fluid. This is the first time that all of these have been associated with each other.
S. Saritha and P. Neogi, "Wagging the Contact Line: Transverse and Longitudinal Waves," Journal of Chemical Physics, American Institute of Physics (AIP), Feb 2006.
The definitive version is available at http://dx.doi.org/10.1063/1.2166366
Chemical and Biochemical Engineering
National Science Foundation (U.S.)
Keywords and Phrases
Contact Angle; Oscillations; Surface Roughness; Wetting
Article - Journal
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