Governing Equations for Multiphase Heat and Mass Transfer in Hygroscopic PorousMedia with Applications to Clothing Materials

摘要

Whitaker's theory of coupled heat and mass transfer through porous media wasmodified to include hygroscopic porous materials which can absorb liquid into the solid matrix. The system of equations described in this report should make it possible to evaluate the time-dependent transport properties of hygroscopic and non-hygroscopic clothing materials by including many important factors which are usually ignored in the analysis of heat and mass transfer through textile materials. The set of equations allows for the unsteady capillary wicking of sweat through fabric structure, condensation and evaporation of sweat within various layers of the clothing system, forced gas phase convection through the porous structure of a textile layer, and the swelling and shrinkage of fibers and yarns as they absorb/desorb liquid water and water vapor. Thermal insulation, Sorption, Layers, Heat Transfer, Thermal conductivity, Water vapor, Textiles, Diffusion, Drying, Equations, Mass transfer, Clothing, Hygroscopicity.