同步测量相变材料固、液两相温变热导率  

Method for Simultaneous Measurement of Temperature-Dependent Thermal Conductivity of Solid-Liquid Phase of Phase Change Materials

作　　者：肖何 周天[1] 许张楠 石雷 孙志强[1] XIAO He;ZHOU Tian;XU Zhangnan;SHI Lei;SUN Zhiqiang(School of Energy Science and Engineering,Central South University,Changsha 410083,China)

机构地区：[1]中南大学能源科学与工程学院,长沙410083

出　　处：《工程热物理学报》2024年第9期2759-2766,共8页Journal of Engineering Thermophysics

基　　金：国家自然科学基金面上项目(No.52076217)。

摘　　要：本研究提出了一种同步测量相变材料固、液两相温变热导率的方法。其理论基础是通过将相变区域在时间尺度上离散为若干温度范围极小的温度区间,并利用反问题方法计算出热导率随温度的变化情况。实验装置满足理论模型中各项边界条件,包含相变容器、温度控制系统与数据采集系统。在70~10℃与60~15℃的工况下以正二十烷作为试样测量其温变热导率,并将测量结果与文献值中正二十烷温变热导率测量结果进行对比。实验结果表明本方法测量所得两相温变热导率测量结果可信。与传统方法相比,本研究所提出的测量方法可在一次实验中实现固、液两相温变热导率同步测量,具有较好的应用前景。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,temperature control system and data acquisition system.The temperature-dependent thermal conductivity of n-eicosane was measured at 70∼10°C and 60∼15°C,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 application prospect.

关 键 词：温变热导率 相变材料 测量方法 

分 类 号：TK31[动力工程及工程热物理—热能工程]