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| Laminar Heat Transfer Enhancement of Graphite Tube with Internal FanShaped Fins |
| LI Pengchenga,SUN Zhijiana，TANG Zhoua，YU Zitaoa,b，HU Yacaia
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| (a. Institute of Thermal Science and Power Systems；b. Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province， Zhejiang University, Hangzhou 310027, China) |
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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 highviscosity oil medium in graphite tube with internal fanshaped 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 fanshaped 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 fanshaped fins has the best thermal and flow performance.
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Received: 15 March 2015
Published: 28 April 2016
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