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超临界CO_2在水平三角细微管内层流对流换热的数值模拟 被引量：6

Numerical Simulation on Laminar Convection of Supercritical Carbon Dioxide in Horizontal Triangular Mini Ducts
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摘要 对超临界CO_2在水平等边三角细微管内层流流动与换热进行了数值模拟。给出了冷却条件下,细微管(d=0.5mm)内有代表性的速度、温度剖面,Nusselt数随流体温度的变化,以及管壁面上Nusselt数的分布。研究表明,流体剧烈变化的热物性、浮升力以及三角管的几何特征对管内流动换热的影响非常明显。研究结果对超临界二氧化碳高效紧凑式换热器的设计与优化有重要的意义。 Laminar mixed convective heat transfer of supercritical CO2 in a horizontal mini duct with an equilateral triangular cross section was investigated numerically. The flow patterns and isotherms in the duct with a hydraulic diameter of 0.5 mm, under cooling condition, with and without gravity, were obtained. The local Nusselt numbers were also presented. The results suggest that the effects of buoyancy force, variable physical properties of the fluid, and duct geometric characteristic on flow and heat transfer can be very significant. The results of this work are helpful for the design and optimization of the high efficiency compact supercritical carbon dioxide heat exchangers.
作者 饶政华 廖胜明
机构地区 中南大学制冷空调研究所
出处 《制冷学报》 CAS CSCD 北大核心 2006年第5期43-47,共5页 Journal of Refrigeration
关键词 工程热物理 超临界 三角管 数值模拟 二氧化碳 层流 Engineering thermophysics Supercritical Triangular duct Numerical solution Carbon dioxide Laminar convection
分类号 TK124 [动力工程及工程热物理—工程热物理]
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参考文献12

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二级参考文献14

  • 1饶政华,廖胜明.超临界二氧化碳管内湍流流动和传热的数值模拟[J].流体机械,2005,33(1):71-75. 被引量：13
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  • 3Liao S M,Zhao T S.Measurements of Heat Transfer Coefficients From Supercritical Carbon Dioxide Flowing in Horizontal Mini/Micro Channels[J].Journal of Heat Transfer,ASME Trans.,2002,124(6):413-420.
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共引文献22

同被引文献35

引证文献6

二级引证文献36

制冷学报
2006年 第5期

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