Influence of Liquid Film Properties on Shear-Driven Film Separation at a Sharp Corner due to Wave Formation
Formation of large amplitude waves (LAW) at the interface in shear-driven flows results in more liquid mass separation at a sharp corner. Experimental studies show LAW formation and propagation are affected by liquid film properties such as surface tension and viscosity. LAW characteristics are quantified based on an empirical intensity parameter. Results show that increasing viscosity results in more damping in both LAW formation and propagation along the fetch length, which consequently decreases the liquid mass separation at the corner. However, decreasing surface tension leads to a complicated behavior at the film interface. Decreasing surface tension reduces LAW formation but increases the coalescences of the LAW along the fetch length. The result is increased mass separation at the sharp corner for decreased surface tension.