不同相变材料蓄热特性及液相分数无量纲准则方程式拟合

The Heat Storage Characteristics of Different Phase Change Materials and the Liquid Phase Fraction Dimensionless Criterion Equation Fitting

摘要: 主要应用数值模拟方法对三套管相变蓄热器进行研究，为该结构的蓄热器填充三种不同相变材料(RT82、RT50、LA)提供参考。拟合得到无量纲参数和液相拟合分数，其中低熔点RT50和LA平均努塞尔特数存在上升阶段；得到熔化过程中不同相变材料液相分数、不同蓄热方式的S_teF₀R_a^1/6相关函数；通过不同斯蒂芬数对所得拟合函数验证，结果表明该模型液相分数函数在S_te为0.0765~0.6060范围内适用度高；低于熔点的初温，引入初温参数S_c^1/4

Abstract: ，拟合得到液相分数的S_teF₀S_c^1/4R_a^1/6相关函数。 The main application of numerical simulation method is to study the three-tube phase change heat accumulator, which provides a reference for filling the heat accumulator with three different phase change materials (RT82, RT50, LA). Dimensionless parameters and liquid phase fitting fractions are obtained by fitting. Among them, low melting point RT50 and LA average Nusselt number have a rising stage. S_teF₀R_a^1/6 for different phase change materials and different heat storage methods during the melting process are obtained. Correlation function is verified by the fitting function and obtained by different Stephen number pairs, the results show that the liquid fraction function of the model has high applicability in the range of 0.0765~0.6060 of S_te; the initial temperature below the melting point is introduced. The temperature parameter S_c^1/4 is fitted to obtain the S_teF₀S_c^1/4R_a^1/6 correlation function of the liquid fraction.