非饱和含湿多孔介质传热传质的渗流模型研究

Research on heat and mass transfer in unsaturated porous media

综述了非饱和含湿多孔介质传热传质模型研究的发展。从多相渗流和扩散迁移机制出发建立以温度、压力和饱和度为基本变量的实用化三参数模型。该模型由一组描述水－汽质量守恒、空气质量守恒和能量守恒的非线性偏微分方程组成。利用该模型对埋管的热过程、砂土物性测量、毛细滞后现象、回湿过程、突发高温作用下多孔介质内部的传热传质过程和冻融过程进行了研究。为了模型的进一步应用，仍需对束缚水饱和度以下毛细压力与饱和度的关系、导热系数的影响因素及其获取方法、非饱和多孔介质传热传质的边界效应和滞后效应的物理机理等方面深入研究。非饱和多孔介质中溶质的运移更是一个饶有意义的研究课题。

This article reviews the development of models for heat and mass transfer in unsaturated porous media especially the three variable model. The three variable seepage model was consisted of three strongly nonlinear partial equations, which express the mass conservation of moisture and air and the energy balance of the porous media. The model was applied successfully to simulate the transport process of buried pipe, capillary hysteresis, rewetting, consolidating and thawing in porous media. The model was applied to simulate the transport phenomena during sudden heating and the process of conductance measuring. The future work needed for the model was also discussed.