上海交通大学学报(自然版) ›› 2016, Vol. 50 ›› Issue (04): 557-562.

• 能源与动力工程 • 上一篇    下一篇

扇形内翅片石墨管层流强化传热性能

李鹏程a,孙志坚a,汤舟a,俞自涛a,b,胡亚才a   

  1. (浙江大学 a. 热工与动力系统研究所; b. 浙江省低温技术重点实验室, 杭州 310027)
  • 收稿日期:2015-03-15 出版日期:2016-04-28 发布日期:2016-04-28
  • 基金资助:
    金华市科学技术研究计划重点项目(20131031)资助

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

摘要: 摘要: 利用数值模拟方法对一种高黏度的油类介质在6种不同布置交错角度(0°,30°, 45°,60°,75°,90°)的扇形内翅片石墨换热管中层流的强化传热和流动规律进行了研究.结果表明,扇形内翅片的强化换热效果明显.与无翅片的石墨换热管相比,6种布置角度的扇形内翅片对流换热系数分别增大22.69%,42.49%,62.28%,63.44%,65.47%,66.47%.就流动性能而言,扇形内翅片的石墨管6种布置角度下的阻力分别增大了191.88%,252.01%,333.10%,364.33%,385.51%,400.43%.为了明确石墨管内添加扇形内翅片后的强化传热效应,采用了换热性能评价指标(PEC)对6种布置角度进行了评价研究,结果显示45°布置角度时PEC评价准则数的平均值达到最大,为1.265,说明布置角度为45°时强化换热效果最理想.

关键词: 扇形内翅片, 石墨管, 层流, 强化传热, 数值模拟

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

中图分类号: