Abstract
In this work, a unified model has been developed for the drying of the glassy polymeric coatings by studying the solvent evaporation from the poly(methyl methacrylate)/ethyl benzene system as a one dimensional numerical moving boundary experiment with simultaneous heat and mass transfer. The developed model is based on sound non equilibrium thermodynamics principles by considering visco-elastic contribution to diffusion at the late stage of drying. Moreover, sol-gel transition is considered to explain the high solvent concentration far away from the gas-liquid interface (drying surface) at the end of the drying experiment. The Galerkin finite element method is used to solve the model equations. The model predictions for the drying rate and solvent concentration profiles are found to be in satisfactory agreement with the available experimental data. This work can be implemented to design and optimize industrial processes.
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