含湿毛细多孔介质湿区相变传热传质干燥三方程模型

含湿毛细多孔介质的干燥过程是复杂的相变传热传质过程。该过程涉及渗流、扩散、传热、毛细效应和相变等机理，建立了含湿毛细多孔介质湿区干燥过程相变传热传质数学模型，采用全隐式有限差分方法对一维模型进行了数值计算。得到了含湿毛细多孔介质湿区干燥过程中的液相饱和度、温度和混合气体压力的变化，并分析了该计算结果。

A THREE-EQUATION MODEL FOR HEAT AND MASS TRANSFER WITH PHASE CHANGE IN WET REGION OF CAPILLARY POROUS MEDIA DURING DRYING

A Three~equation model is established to describe the drying process of a wet capillary porous media,which is a complicated process of heat and mass transfer with phase change supported by various theories such as osmosis,diffusion,heat transfer,capillary and phase change. This article demonstrates a model of three non~linear coupled partial differential equations,which predict the variation of saturation,temperature,and mixture gas pressure in wet region during drying.The numerical solution technique employed to solve the one~dimension model is the fully implicit time finite difference.The changes of three parameters were simulated and the numerical results were analyzed.