多孔材料有效导热系数的试验研究

The Theoretical Analysis and Experimental Research of the Effective Thermal Conductivity of Porous Materials

本文根据多孔材料的传热特点,修正了气孔内辐射的传热计算,发展了辐射当量导热系数的新概念,建立了多孔材料有效导热系数的数学模型,推导出计算多孔材料有效导热系数的计算式。试验结果和有关文献的试验结果均证明:该模型更加符合多孔材料的实际情况,计算精度更高。

In this paper, according to the special feature of heat transfer in the porous materials, the calculation of radiation heat transfer in pores is improved, a new concept - equivalent radiation thermal conductivity is built. A new mathematical model for calculation of the effective thermal conductivity of the porous materials is developed. The experiment results of this paper and relevant literature prove that the new mathematical model accords more with the reality of the porous materials than previous mathematical models and its precision is higher than any of the others.