Analysis of Heat and Mass Coupled Transfer Laws and Influencing Factors in Porous Media
多孔介质中热质耦合传输规律及影响因素分析

摘要

多孔介质中的热量与水分传输具有明显的相互作用特征。温度梯度能够引起液态水迁移、水蒸气扩散 及相变，含水状态变化又会改变有效导热系数、热容量和局部温度分布，形成持续演化的热质耦合过程。基 于经典热湿传输理论及土壤、多孔建筑材料试验结果，分析液相迁移、气相扩散、潜热传递和非均匀湿度分 布的作用规律，讨论孔隙率、含水率、孔径结构、温度梯度及边界条件的影响。研究表明，热质传输参数具 有较强状态依赖性，动态参数表征和多场联合测试是提高预测精度的重要途径。

Abstract

Heat and moisture transfer in porous media exhibits obvious interactive characteristics. Temperature gradients can induce liquid water migration, water vapor diffusion, and phase change, while changes in moisture content can alter the effective thermal conductivity, heat capacity, and local temperature distribution, forming a continuously evolving heat and mass coupled transfer process. Based on classical heat and moisture transfer theories and experimental results on soil and porous building materials, this paper analyzes the action laws of liquid-phase migration, gas-phase diffusion, latent heat transfer, and non-uniform humidity distribution, and discusses the effects of porosity, moisture content, pore size structure, temperature gradient, and boundary conditions. The study shows that heat and mass transfer parameters have strong state dependence, and dynamic parameter characterization and multi field joint testing are important approaches to improving prediction accuracy.