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Journal of Enhanced Heat Transfer
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ISSN Imprimir: 1065-5131
ISSN En Línea: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.2015013117
pages 439-462

EFFECTS OF THE INTERACTION OF LONGITUDINAL VORTICES ON THE FLOW FIELD AND HEAT TRANSFER OVER A FLAT-TUBE-AND-FIN HEAT EXCHANGER

KeWei Song
Department of Mechanical Engineering, Lanzhou Jiaotong University, 88 West Anning Rd. Anning District, Lanzhou 730070, Gansu, China
Liang-Bi Wang
School of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China; Key Laboratory of Railway Vehicle Thermal Engineering of MOE, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China

SINOPSIS

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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