Numerical simulation and performance analysis of heat transfer enhancement in tube by longitudinal vortex

被引：0
|
作者：
Li F. [1 ]
Lu G. [1 ]
Ma G. [1 ,2 ]
Zhai X. [1 ]
Yang S. [3 ]
机构：
[1] College of Mechanical and Power Engineering, Shanghai Jiao Tong University, Shanghai
[2] Shandong Linuo Ruite New Energy Co., Ltd., Jinan
[3] Yunnan Jiantou Thirteenth Construction Co., Ltd., Kunming
来源：
Huagong Xuebao/CIESC Journal | 2021年 / 72卷
关键词：
Flow; Heat transfer; Longitudinal vortex; Turbulent flow; Vortex generator;
D O I：
10.11949/0438-1157.20201563
中图分类号：
学科分类号：
摘要：
Various technologies on heat transfer enhancement have been exploited to develop more efficient compact heat exchanging devices. In this research, turbulent heat transfer and flow characteristics in a circular tube, with longitudinal vortex generators (LVG) on the wall, were numerically investigated. The effects of LVG shapes and number of pairs on Nusselt number, friction factor and performance evaluation criteria were numerically studied. The results showed that pairs of longitudinal vortexes were generated behind the LVG, which enhanced the fluid mixing in the tube, and promoted the momentum and energy exchange between the wall boundary layer and the main flow. Further analysis indicated that the tube with 4 pairs of rectangular winglets on each row held the best heat transfer performance, and the Nusselt number was improved by 27.2% compared with smooth tube on average. The tube with 4 pairs of trapezoidal winglets on each row presented the best performance evaluation criteria, and the value reached 0.97 — 1.07. © 2021, Editorial Board of CIESC Journal. All right reserved.
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页码：120 / 126
页数：6
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