Publicou 8 edições por ano
ISSN Imprimir: 1065-5131
ISSN On-line: 1563-5074
Indexed in
EFFECTS OF THE INTERACTION OF LONGITUDINAL VORTICES ON THE FLOW FIELD AND HEAT TRANSFER OVER A FLAT-TUBE-AND-FIN HEAT EXCHANGER
RESUMO
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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Song KeWei, Wang LiangBi, Effects of longitudinal vortex interaction on periodically developed flow and heat transfer of fin-and-tube heat exchanger, International Journal of Thermal Sciences, 109, 2016. Crossref
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Song KeWei, Hu WanLing, Liu Song, Wang LiangBi, Quantitative relationship between secondary flow intensity and heat transfer intensity in flat-tube-and-fin air heat exchanger with vortex generators, Applied Thermal Engineering, 103, 2016. Crossref