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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

INTERACTION OF LONGITUDINAL VORTICES WITH CO-ROTATING OR COUNTER-ROTATING DIRECTIONS AND THE EFFECTS ON FLUID FLOW AND HEAT TRANSFER

Get access (open in a dialog) DOI: 10.1615/IHTC16.hte.024304
pages 5151-5158

Abstract

Longitudinal vortices are beneficial to the heat transfer enhancement of heat exchangers. In order to obtain a better heat transfer performance, researchers always try to punch lots of vortex generators which can generate longitudinal vortices out of the fin surface. But the increasing number of vortex generators is not necessarily linked with the rise in heat transfer performance augmentation due to the interaction between longitudinal vortices. The heat transfer performance of vortex generators is obviously affected by the interaction between longitudinal vortices. The effects of rotating directions of longitudinal vortices on the interaction between longitudinal vortices and the heat transfer performance have not been well discussed in the public literature. The differences between interactions of longitudinal vortices with counter-rotating directions and that with co-rotating longitudinal vortices are studied and discussed in detail to further understand the interaction phenomenon in present study. The results show that the interaction of longitudinal vortices with co- or counter-rotating directions has different effects on flow field and heat transfer performance. The co-rotating longitudinal vortices merged together while the counter-rotating longitudinal vortices keep separated during the interaction process. New and important understanding about the interaction of longitudinal vortices are obtained.