混凝土热湿耦合数值计算中的参数拟合

Parameter fitting in numerical analysis of coupled heat and mass transportin concrete

为了更深入地研究混凝土中的湿度和温度场,根据多相体系非连续介质中的热湿耦合传导理论对混凝土的热湿状态和耦合传导进行了研究。使用高精度电容湿度测量仪器对混凝土预留孔中的空气含湿饱和度进行测量,发现测量值与混凝土相对含湿率在相对含湿率大于0.85小于1.0时存在线性关系,进而拟合了热湿耦合方程中的物理参数。耦合计算结果表明,这种拟合参数的物理意义明确、确定参数简便、数值稳定性好,为混凝土温湿度场计算提供了一种新的方法。

The heat and moisture transport in concrete was analyzed using the theory of heat and mass transfer in multiphase, discontinuous media. A high precision capacitance probe was used to measured the moisture levels and temperatures in preformed holes in the concrete. The temperatures varied linearly with the relative moisture content for relative humidities between 0.85 and 1.0. The measurements were used to calculate coefficients coupling the heat and mass transfer equations for the simulation. The results show that the method is robust, physically realistic, and provides more accurate predictions of the temperature and moisture distributions in concrete. The method provides a new alternative model for the heat and mass transport in concrete.