A method to simultaneously measure the temperature-dependent thermal conductivity of solid-and liquid-phase of phase change materials has been proved in this study.The theoretical basis is to discretize the temperature region of phase transition into several temperature intervals with very small temperature ranges on a time scale and calculate the thermal conductivity that is changed with temperature by using inverse problem method.Designed an experimental equipment to satisfy the boundary conditions of the theoretical model,including phase change vessel,tempera-ture control system and data acquisition system.The temperature-dependent thermal conductivity of n-eicosane was measured at 70～10℃ and 60～15℃,the measurement results were compared with the temperature-dependent thermal conductivity of n-eicosane that mentioned in the literature.The experimental results show that the measurement results of the two-phase temperature-dependent thermal conductivity measured by this method are reliable.Compared with the traditional method,the method in this study can realize the simultaneous measurement of the temperature-dependent thermal conductivity of solid and liquid phase in once experiment.This method has a good applica-tion prospect.
维普
万方数据
