Surface Elasticity and Surface Viscosity in a Coating Flow

Abstract

The effect of adsorbed surfactants on the 110w that takes place in the film forming zone of the slot coater is examined. The numerical technique employed in this
work, that is based on the finite element method, can suitably handle viscous free surfaces with locally varying interfacial properties. The complete information
produced by the computational code allows to relate the interfacial dynamics to the mechanism involved in the mass transport process: conection and adsorption/desorption. The results presented show that the effects produced by both interfacial viscosity and interfacial elasticity are rather similar; however, the
operating conditions that make them more noticeable are different.