JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2016, Vol. 46 ›› Issue (2): 128-134.doi: 10.6040/j.issn.1672-3961.0.2015.210

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Convective heat transfer in micro pin fin heat sinks with different cross section shapes under variable heating loads

GUAN Ning1, LUAN Tao1*, LIU Zhigang2, ZHANG Chengwu2, JIANG Guilin2, QIU Delai2   

  1. 1. School of Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, China;
    2. Energy Research Institute, Shandong Academy of Sciences, Jinan 250014, Shandong, China
  • Received:2015-07-03 Online:2016-04-20 Published:2015-07-03

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Abstract: In order to investigate the flow and convective heat transfer characteristics under different heating loads in micro pin fins,test sections of micro pin fins with different cross section shapes of circle, diamond and triangle were precision machined. An integraed heating system was used to to measure the pressure drops, frictional resistance factors and thermal resistance in micro pin fins. Based on the experimental results, the impact of heating load on the flow resistance and the heat transfer in micro pin fins with Reynolds number ranging from 0~1 000 was explored. It was found that the friction factors in the three types of micro pin fins became large with the increase of the heating load, but this phenomenon disappeared when Re>400 for the circle and diamond micro pin fins, and Re>250 for the triangular micro pin fins. The convective heat transfer in micro pin fins with cross section shapes of circle, diamond was enhanced by increasing the heating load, but the Nu in triangular micro pin fins became large with the increase of the heating load when Re<250, and then it became slightly smaller when Re>250.

Key words: microchannels, heat transfer, convective heat transfer, micro pin fins, heating loads, flow resistance, flow

CLC Number: 

  • TK124
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