Coupled heat and moisture transfer in multi-layer building materials
Coupled heat and moisture transfer in multi-layer building materials
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DOI：
10.1016/j.conbuildmat.2008.05.015
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发表时间：
2009-02
影响因子：
7.4
通讯作者：
Menghao Qin;R. Belarbi;A. Aït-Mokhtar;L. Nilsson
中科院分区：
文献类型：
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作者：
Menghao Qin;R. Belarbi;A. Aït-Mokhtar;L. Nilsson
建立了一个模拟多层多孔建筑材料热湿耦合迁移的动态数学模型。蒸汽含量和温度被选为主要的驱动电位。采用有限差分法对控制方程进行离散。在这项研究中还开发了一种新的实验装置。测量了试样内部瞬态温度和湿度分布的演变。给出了温度梯度系数的确定方法。对几种建筑材料（砂岩和石灰-水泥砂浆）的水分扩散系数、温度梯度系数和吸附-解吸等温线进行了实验测定。通过与实验数据的比较，验证了模型的正确性.该方法的另一个优点在于，用于预测非等温水分流动所需的传输特性仅包含蒸汽扩散系数和温度梯度系数。它们相对简单，很容易确定。
A dynamic mathematical model for simulating the coupled heat and moisture migration through multi-layer porous building materials was proposed. Vapor content and temperature were chosen as the principal driving potentials. The discretization of the governing equations was done by the finite difference approach. A new experimental set-up was also developed in this study. The evolution of transient temperature and moisture distributions inside specimens were measured. The method for determining the temperature gradient coefficient was also presented. The moisture diffusion coefficient, temperature gradient coefficient, sorption–desorption isotherms were experimentally evaluated for some building materials (sandstone and lime-cement mortar). The model was validated by comparing with the experimental data with good agreement. Another advantage of the method lies in the fact that the required transport properties for predicting the non-isothermal moisture flow only contain the vapor diffusion coefficient and temperature gradient coefficient. They are relatively simple, and can be easily determined.