含孔隙及界面热阻的复合材料有效导热系数

Effective thermal conductivity of composite materials containing pore and interface thermal resistance

以最小热阻力法则及比等效导热系数法,通过修正串-并联模型,建立含界面热阻的固-固相复合材料等效导热模型,将固-固相复合材料转换为导热系数为等效热导率的单相固体材料,再利用含孔隙的单相材料导热系数模型推导含孔隙和界面热阻的复合材料有效导热系数。计算含孔隙及界面热阻的复合材料的有效导热系数并讨论气孔、分散相的含量及颗粒尺寸对其有效热导率的影响。将有效导热系数的理论值与相关实验数据进行比较。结果表明两者吻合较好,证明公式的准确性。

Based on the laws of the minimal thermal resistance and the specific effective thermal conductivity,the effective thermal conductivity of solid-solid phase composite material containing interface thermal was established by the modifying the series-parallel connection model.Thus the solid-solid phase composite material was viewed as the single phase solid material that the thermal conductivity is equal to the effective thermal conductivity.Then,the thermal conductivity of the composite material containing pore was derived by the heat transfer model of a single phase material containing pore.The effective thermal conductivity of composite materials containing pore and interface thermal resistance was deduced.And the effects,such as pores,particle size and volume fraction of dispersed phase on thermal conductivity were investigated.The calculation values agree well with the experimental results obtained from the other literature which show the method is effective.