A comparative study of the effect of varying wall heat flux on melting characteristics of phase change material RT44HC in rectangular test cells
A comparative study of the effect of varying wall heat flux on melting characteristics of phase change material RT44HC in rectangular test cells
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DOI：
10.1016/j.ijheatmasstransfer.2019.07.038
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发表时间：
2019-10
影响因子：
5.2
通讯作者：
M. Fadl;P. Eames
中科院分区：
文献类型：
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作者：
M. Fadl;P. Eames
给出了矩形相变材料试验室壁面热流密度不同值对熔化过程影响的大量实验研究结果。建立了一个由聚碳酸酯薄板、铜板和云母加热器组成的矩形截面试验室。在实验过程中，均匀的壁面热流(Q“WALL= 675、960和1295 W/m2)被施加到测试单元的左右两侧。用热电偶测量了PCM内部不同位置和铜板表面的温度，用红外相机测量了聚碳酸酯薄板外表面的温度分布。结果表明，壁面热流密度与相变材料中的熔体分数之间具有很强的相关性，因为它驱动了对流换热。透明的聚碳酸酯壁使观察固/液界面的位置和确定熔体分数成为可能。这些实验已经产生了一个重要的实验数据集，用于验证模拟固/液相变过程的数值模型和与例如潜热储能系统相关的几何构型的相变熔化。
Results of an extensive experimental investigation performed to study the effect of different values of wall heat flux in a rectangular PCM (phase change material) test cell on the melting process are presented. A new experimental system consisting of a rectangular cross-section test cell formed from polycarbonate sheet, copper plates and mica heaters was constructed. During experiments uniform wall heat flux (q″wall= 675, 960 and 1295 W/m2) were applied to both the left and right sides of the test cell. Thermocouples were used to measure the temperature at different locations inside the PCM and on the surface of the copper plates and an infrared camera was used to measure the polycarbonate sheet external surface temperature distribution. The results show the expected strong correlation between the magnitude of wall heat flux and the melt fraction in the PCM as it drives the convective heat transfer. The transparent polycarbonate wall makes it possible to observe the location of the solid/liquid interface and determine melt fractions. The experiments have produced a significant experimental data set for the validation of numerical models simulating the solid/liquid phase change process and PCM melting in geometrical configurations relevant to, for example, latent heat thermal energy storage systems.