（相变）复合材料瞬态导热性能的简化计算方法

一般情况下复合材料不存在有效导温系，其瞬态热性能需藉三维非稳态传热模型分析。如掺温材料中涉及相变材料，由于其等效比热容与温度强烈相关，使得描述复合材料瞬态传热性能的热扩散方程呈现很强的非线性，更增加了求解的难度。该文探讨了利用等效一维均质上变材料模型分析（相变）复合材料瞬态传热特性的可行性，结合算例，分析了该方法的适用范围。结果表明，当掺混材料的相对尺寸不太大时，（相变）复合材料可当作均质（相变）材料，其瞬态传热性能可藉等效热物性计算。对于许多实际问题，上述方法可简化分析，节省计算量。

SIMPLIFIED METHOD FOR ANALYZING THE TRANSIENT THERMAL PERFORMANCE OF COMPOSITE(PHASE CHANGE)MATERIAL

In general there is no effective thermal diffusivity for composite material.Its transient thermal performance has to be analyzed by using 3-D transient heat transfer model.The analysis for the transient thermal performance of composite material composing phase change material is much more complicated because the apparent specific heat of the composite material is temperature-dependent.The present paper studied the feasibility of using effective thermal properties to analyze the transient thermal performance of composite (phase change)material.By using case study method,the suitable region for using the aforementioned method was discussed.The results indicated that if the size of the doped (phase change)material is small,the composite material can be regarded as homogeneous(phase change) material.Its transient thermal performance can be calculated by using effective thermal physical properties.For some practical applications,this method will simplify the analysis and the calculation a lot.