Thermodynamic performance analysis of supercritical pressure CO2 in tubes
Thermodynamic performance analysis of supercritical pressure CO2 in tubes
复制标题
超临界压力CO2管内热力学性能分析
DOI：
10.1016/j.ijthermalsci.2019.106102
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发表时间：
2019-12
影响因子：
4.5
通讯作者：
Cui Xinying
中科院分区：
文献类型：
--
作者：
Zhang Haiyan;Guo Jiangfeng;Huai Xiulan;Cui Xinying
对超临界CO2在管内的制冷和制热过程进行了数值模拟。研究了质量通量、热流密度、压力、横截面形状和浮力对换热系数的影响，并讨论了峰值换热系数的决定因素。结果表明，较小的热流质量比q/G和压力有利于传热，流体摩擦和熵产也较小。根据热力学第一和第二定律，在三种不同截面的管中，圆形管具有最好的整体传热性能。在加热工况下，当q/G比较大时，入口处可能发生传热恶化。用半圆管代替圆管能有效地减轻局部损伤。局部换热系数与近壁有效导热系数有关，而与静导热系数无关。浮力引起的传热增强和半圆管中的劣化缓解也可以归因于改善的近壁有效导热系数。
Thermodynamic characteristics of supercritical pressure CO2were numerically investigated in tubes under cooling and heating conditions. The effects of mass and heat fluxes, pressure, cross section shape and buoyancy were studied, and the determinant of the peak heat transfer coefficient was discussed. The results indicated that smaller ratio of heat flux to mass fluxq/Gand pressure are beneficial to the heat transfer and could lead to smaller fluid friction and entropy generation. Among three tubes with different cross sections, the circular one has the best bulk heat transfer performance in terms of both first and second laws of thermodynamics. Under heating conditions, the heat transfer deterioration may occur at the entrance when the ratio ofq/Gis relatively large. Replacing the circular tube with a semicircular one could alleviate local deteriorations efficiently. The local heat transfer coefficient has a lot to do with the near-wall effective thermal conductivity instead of the static thermal conductivity. The heat transfer augmentation caused by buoyancy and the deterioration mitigation in the semicircular tube could be attributed to improved near-wall effective thermal conductivity as well.
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