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

Abstract

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

CLC Number:

TK 124

LI Pengchenga,SUN Zhijiana，TANG Zhoua，YU Zitaoa,b，HU Yacaia. Laminar Heat Transfer Enhancement of Graphite Tube with Internal FanShaped Fins[J]. Journal of Shanghai Jiaotong University, 2016, 50(04): 557-562.

References

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