| 摘要: |
| 对超临界CO2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。 |
| 关键词: 工程热物理 超临界 三角管 数值模拟 二氧化碳 层流 |
| DOI： |
| 修订日期：2005-08-15
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| 基金项目: |
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| Numerical Simulation on Laminar Convection of Supercritical Carbon Dioxide in Horizontal Triangular Mini Ducts |
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| Abstract: |
| Laminar mixed convective heat transfer of supercritical CO_2 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. |
| Key words: Engineering thermophysics,Supercritical,Triangular duct,Numerical solution,Carbon dioxide,Laminar convection |
