Journal of Shanghai Jiaotong University ›› 2016, Vol. 50 ›› Issue (04): 557-562.

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Laminar Heat Transfer Enhancement of Graphite Tube with Internal FanShaped Fins

LI Pengchenga,SUN Zhijiana,TANG Zhoua,YU Zitaoa,b,HU Yacaia   

  1. (a. Institute of Thermal Science and Power Systems;b. Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province, Zhejiang University, Hangzhou 310027, China)
  • Received:2015-03-15 Online:2016-04-28 Published:2016-04-28

Abstract: Abstract: Numerical investigation of different fin angles (0°, 30°, 45°, 60°, 75°, 90°) was conducted to analyze the flow mechanism and heat transfer characteristics of highviscosity oil medium in graphite tube with internal fanshaped fins. The simulation results show that heat transfer enhancement is significant. Over the range of the Reynolds number studied, the Nusselt number at different arrangement angles (0°, 30°, 45°, 60°, 75°, 90°) is 22.69%,42.49%,62.28%,63.44%,65.47% and 66.47% higher than that for graphite tubes without internal fanshaped fins, respectively. The flow resistance for the tube with fins are found increasing by 191.88%,252.01%,333.10%,364.33%,385.51% and 400.43%, respectively. The evaluation index PEC has been introduced for the comparison of six different arrangement angle fins. The results show that the integral average PEC at 45° achieves a maximum value of 1.265 and that when the arrangement angle of fins is 45°, the graphite tubes with internal fanshaped fins has the best thermal and flow performance.

Key words: Key words: internal fanshaped fin, graphite tube, laminar, heat transfer enhancement, numerical simulation

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