Numerical investigation of a finned-tube heat exchanger with novel longitudinal vortex generators

被引：31
作者：
Wang, Wenjin [1 ]
Bao, Yang [1 ]
Wang, Youqing [1 ]
机构：
[1] Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Wuhan 430074, Peoples R China
来源：
APPLIED THERMAL ENGINEERING | 2015年 / 86卷
关键词：
Finned-tube heat exchanger; Novel combined winglet pair; Heat transfer enhancement; Pressure penalty; TRANSFER ENHANCEMENT; FLOW; CHANNEL;
D O I：
10.1016/j.applthermaleng.2015.04.041
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
A novel longitudinal vortex generator (LVG), which is comprised of a modified rectangular wing and an accessory trapezoidal wing, was proposed. The performance of finned-tube heat exchanger with a single row of novel combined winglet pairs (NCWPs) was analyzed. Numerical simulation shows that compared with rectangular winglet pair (RWP), the NCWP generates main vortex with larger centric intensity. Furthermore, the accessory vortex has a lower core and flows into the back of tubes compressing wake regions' size behind tubes due to the influence of accessory wing. It can disturb the developing of boundary layers on the bottom fin and enhance effectively the heat transfer of the wake region behind the tube. Therefore, the performance of heat transfer for finned-tube heat exchanger is significantly enhanced by NCWP with a moderate pressure drop penalty. Compared with the heat exchanger without LVGs, the heat transfer for finned-tube heat exchanger with NCWPs is improved by 1.8-24.2%, with a pressure penalty increase of 1.3-29.1%. In addition, theory analysis and numerical simulation well agree with the experiment results, indicating the reliability of the research. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：27 / 34
页数：8
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