| 竖直管道内湍流混合对流换热研究 |
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| 引用本文： | 刘峰,姜培学,S HE,J D JACKSON. 竖直管道内湍流混合对流换热研究[J]. 工程热物理学报, 2005, 26(2): 286-288 |
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| 作者姓名： | 刘峰 姜培学 S HE J D JACKSON |
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| 作者单位： | 清华大学热能工程系,热能动力工程与热科学重点实验室,北京,100084;英国罗伯特戈登大学工学院,阿伯丁,AB10 7QE;英国曼彻斯特大学工学院,曼彻斯特,M13 9PL |
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| 基金项目： | 高等学校博士学科点专项科研项目 |
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| 摘 要： | 本文对空气在竖直圆管中的湍流混合对流换热进行了实验研究和数值模拟,并对异种气体(氦气)对混合对流换热的影响进行了初步的实验研究。研究发现,空气在竖直圆管中向上流动时,随着热流密度的不断增大,出现换热恶化现象。如果浮升力足够大,则换热效果在降到最低点后又好转。在实验过程中,由于实验条件所限没有发现异种气体对混合对流换热有显著的影响。
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| 关 键 词： | 混合对流 换热恶化 实验研究 数值模拟 |
| 文章编号： | 0253-231X(2005)02-0286-03 |
| 修稿时间： | 2004-12-03 |
STUDIES OF TURBULENT MIXED CONVECTION HEAT TRANSFER IN A VERTICAL TUBE |
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| LIU Feng,JIANG Pei-Xue,S HE,J D JACKSON. STUDIES OF TURBULENT MIXED CONVECTION HEAT TRANSFER IN A VERTICAL TUBE[J]. Journal of Engineering Thermophysics, 2005, 26(2): 286-288 |
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| Authors: | LIU Feng JIANG Pei-Xue S HE J D JACKSON |
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| Abstract: | Turbulent mixed convection heat transfer of air in a vertical tube was investigated through experiments and numerical simulation. Preliminary experimental study was also carried out on the influence of other gas (Helium) on convection heat transfer. The results indicate that for upward flow in a vertical tube, with the increasing of heat flux, heat transfer is reduced by the influence of buoyancy and impairment of heat transfer occurs. If the buoyancy is big enough, heat transfer is impaired to the lowest point and then is recovered. In the experiments with input of other gas (Helium), significant influence was not found due to the limitation of experiment facility. |
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| Keywords: | mixed Convection impairment of heat transfer experimental study numerical simulation |
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