Mathematical simulation of dynamic coupled heat and liquid moisture transfer in multilayer anisotropic porous polymers

A one-dimensional mathematical model describing the dynamic coupled heat and moisture transfer inside multilayered porous polymers and anistropic materials is developed in this reported study. Compared to models published previously, three improvements have been made: (1) the model takes into account the dynamic complex behavior of coupled heat and liquid moisture transfer inside each layer; (2) the model provides different (inter-) boundary conditions that correspond with the contact situations between neighbored layers and the influences from waterproof fabrics; and (3) the combinations of different types of polymer fibers in each layer and their roles with respect to processes of heat and moisture transfer. Physical experiments for liquid transfer, through the layered fabric assemblies with different construction, were carried out to validate the developed model in terms of dynamic temperature and moisture concentration distribution in the assembly, as well as the initial and final absolute liquid volumetric fractions at the surface of the top layer. Good agreement between the calculated and experimental results was obtained. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 1590–1605, 2004