Melting Behaviors of Capric Acid in Rectangular Enclosure
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摘要: 采用焓-多孔介质模型模拟右侧恒温加热的矩形单元内癸酸熔化过程，实验中相变单元前后均设置玻璃观察窗,通过拍照法捕捉相界面位置，验证了模拟计算的准确性，在此基础上,研究了癸酸在不同边界温度条件下熔化时矩形单元内温度分布及相界面变化情况,并分析了癸酸熔化平均努谢尔特数及熔化速率的变化规律.结果表明:平均努谢尔特数随傅里叶数增加逐渐下降,且下降速率渐缓;熔化速率随壁温单调增加,熔化分数与斯蒂芬数、瑞利数、傅里叶数成指数关系,指数系数分别为0.663 5、0.190 6、0.853 5.Abstract: An enthalpy-porous model was used to simulate the melting behaviors of capric acid in a rectangular enclosure with a heated wall on one side. The simulation accuracy was verified by comparing the simulated results with those by experiment. The simulation results showed that average Nusselt number and its decreasing rate reduced gradually with an increase in Fourier number. An exponential function for melting volume fraction was regressed, the exponents of which for Stefan number, Rayleigh number and Fourier number were 0.663 5, 0.190 6, and 0.853 5, respectively.
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Key words:
- capric acid /
- rectangular enclosure /
- melting behavior /
- heat transfer /
- numerical simulation
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