In order to improve the heat exchanger performance,the effects of 15 different arrangements of delta-wing vortex generators on the heat transfer and flow resistance charac-teristics of a flat finned tube heat exchanger are investigated by numerical simulation in the range of Reynolds number 500-3 000.The results show that the closer the vortex generator is to the windward side,the higher the Colburn factor j is when the number of rows of vortex generators is the same,and the j/jR of the 15 arrangements under study increases with the increase of the number of Re.The f/fR in most cases increases with increasing Re number.The fin-and-tube heat exchanger with the first two rows on the windward side of the heat ex-changer retrofitted with vortex generators(i.e.,case B1 arrangement)has the best overall performance with an increase in αJF(evaluation coefficient JF)of 10.15%to 11.12%.
维普
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