Abstract
Vortex generator can produce a turbulence and longitudinal vortices and control the separation point on the tube surface, and then augment an impinging area of the flow on the fin surface. In order to determine the best configuration of vortex generator, it is necessary to know the effects of vortex generator on the flow and heat transfer characteristics over the tube and fin surface. In this study, we used louver-type vortex generator and tried to find out the effect of vortex generator on the flow and heat transfer characteristics. As a result, using a vortex generator, the separation point on the tube moved to downstream up to 130° from the front stagnation point and the dead water region was decreased. Then, the heat transfer characteristics behind the cylinder were improved significantly. The mean Nusselt number on the tube with vortex generator was increased up to maximum 57% than the plane fin.
