地下洞室多孔墙体热湿传递的数值模拟

提出了一种以温度与相对湿度为驱动势的多孔墙体热湿耦合传递的数学模型,该模型同时考虑了水蒸气与毛细孔内液态水的传递。采用控制容积法将理论方程组离散并编制了计算程序,对深埋地下洞室的墙体进行了热湿传递的数值模拟,得到了墙体温度、相对湿度、热流率、湿流率的变化规律。结果表明,墙体传热过程趋于稳定的时间远小于传湿过程。

Numerical simulation of heat and moisture transfer in porous wall in underground caves

Presents a mathematical model described with temperature and relative humidity as driving potential for coupled heat and moisture transfer in porous wall materials. The model includes the transfer of liquid and vapor flow in porous materials simultaneously. A calculation program is developed based on the control equations discretized by using the control volume method. Simulates the heat and moisture transfer for wall in deeply-buried underground caves, and obtains the variation characteristics of temperature, relative humidity, and rate of heat and moisture flow. The results show that the time of heat transfer tending to the steady state is far shorter than that of moisture transfer.