An experimental investigations of the melting of RT44HC inside a horizontal rectangular test cell subject to uniform wall heat flux
An experimental investigations of the melting of RT44HC inside a horizontal rectangular test cell subject to uniform wall heat flux
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DOI：
10.1016/j.ijheatmasstransfer.2019.06.047
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发表时间：
2019-09-01
影响因子：
5.2
通讯作者：
Eames, Philip C.
中科院分区：
文献类型：
--
作者：
Fadl, Mohamed;Eames, Philip C.
在矩形试验室中，实验研究了不同壁面热流密度对RT44HC相变材料熔化过程的影响。为验证相变数值模型的正确性，研制了一种新型的实验试验台。设计和建造的试验台包括由聚碳酸酯薄板和铜板和云母加热器组成的水平矩形截面试验室，以提供受控的均匀壁面热流。实验是在三个恒定的均匀壁面热流值(Q(壁面)‘=675、960和1295W/m(2))施加于测试单元的左右两侧进行的。使用佳能EOS数字单反相机，使用成像技术来可视化和记录固-液界面的运动。结果表明，驱动对流换热的壁面热流密度大小与相变过程中熔体分数的发展有很强的相关性。当输入功率从675W/m(2)增加到960W/m(2)到1295W/m(2)时，熔化过程的总时间分别减少了26.3%和42.10%。由测量温度和熔体分数发展观测组成的原始数据集为验证旨在模拟矩形截面试验室中熔化过程的数值模型提供了有用的数据集。(C)2019年提交人。爱思唯尔有限公司出版。
This study experimentally investigates the effect of different values of wall heat flux intensity on the melting of RT44HC Phase Change Material (PCM) in a rectangular test cell. A new novel experimental test rig to provide accurate data for the validation of numerical models of phase change was developed. The designed and constructed test rig consists of a horizontal rectangular cross-section test cell formed from polycarbonate sheet with copper plates and mica heaters to provide controlled uniform wall heat flux. Experiments were performed for three constant uniform wall heat flux values (q(wall)'' = 675, 960 and 1295 W/m(2)) applied to both left and right sides of the test cell. An imaging technique was used to visualize and record the movement of the solid-liquid interface using a Canon EOS DSLR Camera. The results obtained show a strong correlation between the magnitude of wall heat flux which drives the convective heat transfer and melt fraction development in the PCM. The results also show that increasing the input power from 675 W/m(2) to 960 W/m(2) to 1295 W/m(2) reduces the total time for the melting process by 26.3% and 42.10% respectively. The raw data set comprised of measured temperatures and observation of melt fraction development provide a useful data set for validation of numerical models aiming to simulate the melting process in a rectangular cross-section test cell. (C) 2019 The Authors. Published by Elsevier Ltd.