| 竖直细圆管中超临界氮的对流换热研究 |
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| 引用本文： | 黄禹,沈飚,张鹏,王如竹. 竖直细圆管中超临界氮的对流换热研究[J]. 低温与超导, 2009, 37(7) |
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| 作者姓名： | 黄禹 沈飚 张鹏 王如竹 |
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| 作者单位： | 上海交通大学制冷与低温工程研究所,上海,200240;上海交通大学制冷与低温工程研究所,上海,200240;上海交通大学制冷与低温工程研究所,上海,200240;上海交通大学制冷与低温工程研究所,上海,200240 |
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| 摘 要： | 在内径为2mm的竖直细圆管内进行了向上流动的超临界对流换热实验。通过实验发现,质量流量、进口温度对壁面温度分布以及压降有很大影响;并讨论了换热发生增强和恶化的原因;用浮升力和热加速准则解释了其中的一些热流体现象。并基于FLUENT软件进行了数值计算,与实验结果进行比较,分析表明,数值计算预测壁面温度分布和压降有一定的适用性。
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| 关 键 词： | 超临界氮 换热 换热恶化 浮升力 数值计算 |
Convection heat transfer of supercritical nitrogen in a small vertical tube |
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| Huang Yu,Shen Biao,Zhang Peng,Wang Ruzhu. Convection heat transfer of supercritical nitrogen in a small vertical tube[J]. Cryogenics and Superconductivity, 2009, 37(7) |
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| Authors: | Huang Yu Shen Biao Zhang Peng Wang Ruzhu |
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| Affiliation: | Institute of Refrigeration and Cryogenics;Shanghai Jiaotong University;Shanghai 200240;China |
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| Abstract: | Convection heat transfer of supercritical nitrogen in a small vertical tube with a diameter of 2mm was investigated experimentally.The tests investigated the effects of mass flow rate,inlet temperature on the local wall temperature and pressure drop,as well as the phenomena of enhanced and deteriorated heat transfer caused by buoyancy and thermal acceleration.Numerical simulations are carried out by FLUENT,the numerical predictions correspond well to the experimental data under some conditions,but still nee... |
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| Keywords: | Supercritical nitrogen Heat transfer Deterioration of heat transfer Buoyancy Numerical simulation |
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