Effective thermal conductivity (ETC) is a very important index for evaluating the thermal property of heterogeneous
materials, which include more than two different kinds of materials. Several analytical models were proposed for
predicting the ETC of heterogeneous materials, but in some cases, these models cannot provide very accurate
predictions. In this work, several analytical models and numerical simulations were studied in order to investigate
the differences among them. In addition, some factors which would influence the ETC of heterogeneous materials
were investigated by numerical simulation. The results demonstrated that the numerical simulation can provide
very accurate prediction, indicated that different analytical models should be selected to predict specific problems
based on their assumptions, and suggested that more variables need to be considered in order to improve these
analytical models, such as inclusion shape, inclusion size, distribution of inclusions and contact area. Besides,
numerical method could be an effective and reliable way to obtain the ETC of heterogeneous materials with any
kind of complicated structures.
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