乾燥プロセスにおける気流による液膜の非定常流動に関する数値解析

抄録

Plastic thin film is manufactured by drying process where hot air jet is imposed on liquid thin layer. In the process, complicated unsteady phenomena take place, in which convection is driven in the liquid layer by shear stress caused by the air jet and the evaporation occurs at the same time. To understand the process, we did the experiment where PVA (polyvinyl-alcohol) solution was coated on a glass plate and air jet was given for drying the liquid. We did measurement of fluid velocity by visualizing the surface flow of the liquid film, measurement of changing evaporation rate of water, and numerical analysis of the liquid flow. In this paper we report the fluid flow analysis considering the viscosity increase by the evaporation, and investigation about the evaporation rate of water from the liquid to the air.