研究土壤热湿迁移特性的非平衡热力学方法

NON-EQUILIBRIUM THERMODYNAMICS METHOD OF HEAT AND MOISTURE TRANSPORT PROPERTIES IN UNSATURATED SOILS

运用非平衡热力学理论分析了土壤非饱和区热湿迁移的热力学“力”和“流”，建立了迁移过程的热力学唯象方程。通过对土壤非饱和区热湿迁移机理的分析，利用扩散定律和气体状态方程推导了热湿迁移唯象方程中的有关唯象系数的数学表达式，分析了温度、含水率及蒸汽分压力对唯象系数的影响。

Based on the non-equilibrium thermodynamic theory, the thermal driving forcesand the fluxes in heat and mass transfer process for unsaturated soil were analyzed.The mechanics of heat and mass transfer in unsaturated soil were discussed and thephenomenological equations to describe the transport process in unsaturated soil wereestablished. By means of the diffusion law and the equation of state for ideal gas, theexpressions of the coefficients in the phenomenological equations were deduced. Theeffects of temperature, water content and partial vapor pressure on thephenomenological coefficients were also discussed.