Research in Moisture Transport through One and Two-layered Porous Composites

摘要

Research into the moisture transport processes in porous materials is primarily important for theoretical mod- elling and industrial applications in the design of energy saving buildings and living environments, etc. Based on experimental investigation, we propose new models which describe one-dimensional transport through one-layered uniform materials and dissimilar two-layered composites. Di?usivity as a function of moisture content is obtained through a Boltzman trans- formation, master curves, and combined numerical and regression techniques. Transport processes in one and two-layered composites are simulated on the basis of extended unsaturated Darcy’s Law using the finite element method (FEM). Simula- tion results show significantly di?erent transport patterns of moisture profile when moisture migrates in di?erent directions, and high agreement with experimental moisture profiles.