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Thermocapillarity-induced vortexes and liquid film dynamics on structured heated walls

Abstract Thermocapillarity-induced flow and evolution of thin liquid films on horizontal structured heated walls are studied theoretically and numerically. The steady deformation of the liquid–gas interface and the vortex flow pattern within the film are predicted for the steady continuous films in the case of grooved walls. The effect of the thickness of the gas layer above the film on the film deformation is quantified. A linear stability analysis of the film is performed. The dynamics of film evolution toward rupture is simulated numerically in the framework of the long-wave theory. The effect of the wall topography on the rupture time and on the film topology at the moment just before rupture is studied. The long-wave model is verified by comparison with full-scale numerical simulations using the volume of fluid method.