扇形内翅片石墨管层流强化传热性能  

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

作　　者：李鹏程[1] 孙志坚[1] 汤舟[1] 俞自涛[1,2] 胡亚才[1] 

机构地区：[1]浙江大学热工与动力系统研究所,杭州310027 [2]浙江大学浙江省低温技术重点实验室,杭州310027

出　　处：《上海交通大学学报》2016年第4期557-562,共6页Journal of Shanghai Jiaotong University

基　　金：金华市科学技术研究计划重点项目(20131031)资助

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.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.

关 键 词：扇形内翅片 石墨管 层流 强化传热 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]