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首页> 外文期刊>International Journal of Heat and Mass Transfer >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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A comparative study of the effect of varying wall heat flux on melting characteristics of phase change material RT44HC in rectangular test cells

机译：壁热通量变化对矩形测试池中相变材料RT44HC熔化特性影响的比较研究

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摘要

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(w)(all)'' = 675, 960 and 1295 W/m(2)) 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. (C) 2019 Elsevier Ltd. All rights reserved.
机译：提出了进行广泛的实验研究的结果，以研究矩形PCM（相变材料）测试池中壁热通量的不同值对熔化过程的影响。构建了一个新的实验系统，该系统由矩形截面的测试室组成，该测试室由聚碳酸酯板，铜板和云母加热器组成。在实验过程中，将均匀的壁热通量（q（w）（all）''= 675、960和1295 W / m（2））施加到测试单元的左侧和右侧。使用热电偶来测量PCM内部和铜板表面上不同位置的温度，并使用红外热像仪来测量聚碳酸酯板的外表面温度分布。结果表明，壁热通量的大小与PCM中驱动对流传热的熔体分数之间存在预期的强相关性。透明的聚碳酸酯壁可以观察固/液界面的位置并确定熔体分数。实验产生了重要的实验数据集，用于验证数值模型的仿真，所述数值模型以与例如潜热热能存储系统有关的几何构型模拟了固/液相变过程和PCM熔化。 （C）2019 Elsevier Ltd.保留所有权利。

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