Heat and Moisture Transfer with Sorption and Phase Change Through Clothing Assemblies: Part II: Theoretical Modeling, Simulation, and Comparison with Experimental Results

Part II of this series reports on a theoretical model and simulation results of coupled heat and moisture transfer with phase change and mobile condensates in clothing assemblies consisting of porous fibrous battings sandwiched by inner and outer layers of a thin covering fabric. The model considers moisture movement induced by partial water vapor pressure, a super saturation state in the condensing region, dynamic moisture absorption of fibrous materials, and the movement of liquid condensates. The theoretical results of the model are compared and agree well with the experimental ones. A numerical simulation using the model shows that inner fibrous battings with higher fiber contents, finer fibers, greater fiber emissivity, higher air permeability, a lower disperse coefficient of surface free water, and a lower moisture absorption rate cause less condensation and moisture absorption, which is beneficial to thermal comfort during and after exercising in cold weather conditions.