Influence of heating load on heat transfer characteristics in micro-pin-fin arrays

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• 作者：Ning Guan ; Tao Luan ; Guilin Jiang ; Zhi-Gang Liu ; Cheng-Wu Zhang
• 刊名：Heat and Mass Transfer
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：52
• 期：2
• 页码：393-405
• 全文大小：1,308 KB
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• 作者单位：Ning Guan (1)
  Tao Luan (1)
  Guilin Jiang (2)
  Zhi-Gang Liu (2)
  Cheng-Wu Zhang (2)
  
  1. School of Energy and Power Engineering, Shandong University, Jinan, 250061, Shandong, China
  2. Energy Research Institute of Shandong Academy of Sciences, Jinan, 250014, Shandong, China
  
• 刊物类别：Engineering
• 刊物主题：Engineering Thermodynamics and Transport Phenomena
  Industrial Chemistry and Chemical Engineering
  Thermodynamics
  Physics and Applied Physics in Engineering
  Theoretical and Applied Mechanics
  Engineering Fluid Dynamics
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1181

文摘

Experimental investigations were carried out to explore the convective heat transfer in micro pin-fins with different aspect ratios, and the influence of heating load on Nusselt numbers in micro pin-fins with liquid water as working fluid were investigated. The mechanism of convective heat transfer in micro pin-fins at different heating load were studied by 3-D numerical investigations, and the relationships of thermal physical properties change, the end wall effect and axial thermal conduction with Nu numbers in micro pin-fins were analysed. It was found that the thickness of boundary layer was decreased as much as 33.3 % attributed to the destructive effect of thermal physical properties change, and convective heat transfer in the micro pin-fin channel was more than 20 % enhanced by the flow disturbance caused by the increase of temperature difference. The discrepancy of Nu in micro pin-fin channel with different aspect ratios reached 34.59 %, and this discrepancy was reduced by the increase of heating load. The maximum value of impact factors of dynamic viscosity and thermal conductivity on the Nu in micro-pin-fins reached 25.02 and 7.68 %, respectively.