Abstract
The purpose of this experiment is to provide basic understanding about a film drying process for future applications. For elucidation of the detailed behavior of surface flow and the influence by the shear stress of the wind, forced-convection drying with air jet was observed. PVA (polyvinyl-alcohol) aq.sol. was coated on a glass plate. A tracer particle was distributed on the liquid film surface. Coating solutions were photographed with a digital camera. Image analysis was performed from visualized surface flow of the liquid film. It was observed that a convection occurred on the liquid film surface of the PVA aq.sol. When viscosity was smaller, higher velocity of free surface flow was found.
