Mathematical Model of Coupled Heat and Mass Transfer in Unsaturated Soils

Mathematical Model of Coupled Heat and Mass Transfer in Unsaturated Soils *1

ＩＮＴＲＯＤＵＣＴＩＯＮＳｏｉｌｉｓａｔｙｐｉｃａｌｐｏｒｏｕｓｍｅｄｉｕｍｔｈａｔｉｎｃｌｕｄｅｓｓｏｌｉｄｐｈａｓｅ，ｌｉｑｕｉｄｐｈａｓｅａｎｄｇａｓｐｈａｓｅ．Ｔｈｅｓｏｌｉｄｐｈａｓｅｉｓｍａｄｅｕｐｏｆｕｎｉｆｏｒｍｔｉｎｙｐａｒｔｉｃｌ...

A systematic study of coupled heat and mass transfer in unsaturated soils under complex boundary conditions was carried out and a mathematical model of heat and mass transfer in unsaturated soils was established by non equilibrium thermodynamic theory. The gradient of volumetric moisture content, the gradient of temperature, the salt mass concentration and vapor pressure were the primary driving forces influencing the process of heat and mass transfer in unsaturated soils. Based on the thermodynamic analysis and the mass and energy conservation principles, a set of mass and energy equations were developed. The initial and boundary conditions of soil column for one dimension were also given out.