COMSOL的加气混凝土热湿耦合传质模拟分析

Research on mass transfer for coupled heat and moisture through aerated concrete based on COMSOL

采用COMSOL Multiphysics软件进行多孔介质加气混凝土的热湿耦合数值模拟研究.采用双驱动势和优化参数结合的模拟方案,对控制方程进行推导.通过对文献结果的对比,验证了该模型的可行性.模拟分析了环境温度、时间等因素对加气混凝土样品的湿迁移影响,随时间的增加湿传递速率减缓;5~15℃时湿传递速率缓慢,温度的影响较大,15~30℃时湿传递加快且速率保持一致.因此,在干燥环境下,加气混凝土墙体温度低于15℃以下可有效减少外界湿传递.

Numerical simulation of coupled heat and moisture transfer in aerated concrete was studied by using Multiphysics COMSOL software.The control equation was derived by combining the double driving force and the optimization parameters.The feasibility of the model was verified by comparing with the results in literature.The influence of environmental temperature and time on moisture migration in aerated concrete samples was analyzed.The moisture transfer rate slows down with the decrease of temperature from 5 ℃ to15 ℃,while between 15~30 ℃,moisture transfer becomes fast and the transfer rate keeps steedy.In a dry environment,the external moisture transfer can be effectively reduced when the temperature of the aerated concrete wall is less than 15 ℃.