Visualization and flow simulation of a two-layer slot coater

Previous studies of two-layer slot coater have assumed that diffusional and convective mixing of the two miscible liquid layers can be ignored along the interfacial region. In this work, flow visualizations were used to show that diffusional mixing does occur between layers of miscible liquids, as well as convective mixing under certain operating conditions. A series of three dies were investigated which differed in the shape of the separating …