文档介绍：2010 年第 1 期低温工程 No. 1 2010
总第 173 期 CRYOGENICS Sum No. 173
超临界二氧化碳微细管内冷却换热研究
张丽娜刘敏珊董其伍文顺清
郑州大学热能工程研究中心郑州 450002
摘要对超临界二氧化碳在微细竖直圆管内冷却条件下的对流换热进行了数值模拟研究,分析
了不同管径、进口雷诺数及不同的热流率对超临界二氧化碳对流换热的影响,考察管内局部流体温
度、湍动能、湍流雷诺数的变化。湍流模型采用低雷诺数 YS 模型。研究表明,在临界温度区域比较
大的截面,超临界二氧化碳局部传热系数达到最大值,同时管内传热受湍流雷诺数影响较大。
关键词二氧化碳模拟超临界对流换热
中图分类号TB657 文献标识码A 文章编号1000-6516201001-0038-05
Computational study of cooling heat transfer of supercritical
carbon dioxide in mini-tube
Zhang Lina Liu Minshan Dong Qiwu Wen Shunqing
Thermal Energy Engineering Research Centre,Zhengzhou University,Zhengzhou 450002,China
AbstractConvective heat transfer of supercritical carbon dioxide flowing in miniature vertical tubes
under cooling condition was investigated numerically. Different tube diameter,inlet Reynolds number and
heat flux which effect the heat transfer of supercritical carbon dioxide were researched. The change profiles
,
of fluid local temperature turbulence ic energy and turbulent Reynolds number Rey along flow direc-
tion were obtained. The low Reynolds number turbulent model was simulated using YS model. The results
show that the heat transfer coefficient reaches the largest where the region of large-property-variation coveres
largest fluid fields. The heat transfer in tube was influenced bigger by turbulent Reynolds number.
Key words carbon dioxide simulation supericritica