Abstract
A counter flow double pipe concentric tube heat exchanger is taken upon which vortex generators (winglets) are placed in order to improve the heat transfer characteristics. The material selected for the heat exchanger is aluminum with water as the working fluid. Two new designs have been implemented one comprising of the triangular or delta winglets and other of curved or circular arc winglets (with and without holes). There is an increase of 35% in the rate of heat transfer when longitudinal rectangular fins are arranged on the outer surface of the inner tube of the heat exchanger. Curved winglets without punched hole and with an angle of attack of 20° showed the highest heat transfer rate of 1398.43 W which is almost 55 % higher than the unfinned heat exchanger. Also it is been noticed that there are no significant changes in heat transfer rates in case of curved winglets with punched holes and triangular winglets, even though they gave better results compared to unfinned heat exchanger.
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