涡流
强化传热
机械
涡流发生器
鳍
努塞尔数
压力降
传热
热交换器
材料科学
强度(物理)
物理
传热系数
光学
热力学
雷诺数
湍流
复合材料
作者
KeWei Song,Liang-Bi Wang
出处
期刊:Journal of Enhanced Heat Transfer
[Begell House Inc.]
日期:2014-01-01
卷期号:21 (6): 439-462
被引量:3
标识
DOI:10.1615/jenhheattransf.2015013117
摘要
In the flow channel formed by the fins of a flat-tube bank fin heat exchanger with vortex generators (VGs) mounted on the fin surfaces, the longitudinal vortices generated by the VGs beside different tube rows can transport downstream for a long distance. When the vortices generated upstream approach the vortices generated downstream, the longitudinal vortices with co-rotating or counter-rotating directions will interact with each other and result in changing the intensity of the longitudinal vortices. The change in the intensity of the longitudinal vortices will affect the heat transfer performance of the longitudinal vortices. In this paper, the interactions between longitudinal vortices on the fin-side flow channel of a flat-tube bank fin heat exchanger with VGs mounted on the fin surfaces are quantitatively evaluated by using the parameter of secondary flow intensity. The effects of the transverse distance between the VGs and the tube rows on the interactions of the longitudinal vortices are addressed. The results show that the interactions of the longitudinal vortices are sensitive to the arrangement of the VGs. The intensity of the longitudinal vortices and the performance of the heat transfer and pressure drop penalty are obviously affected by the interactions of the longitudinal vortices. When the strongest interaction of the longitudinal vortices occurs, both the intensity of the secondary flow and Nusselt number get minimum values. There is a best-arrangement distance between the VGs and tubes in which the best heat transfer performance can be obtained.
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