Author : Sandip B. Kharge, N.C.Ghuge, V.S. Daund

The Vortex generator is responsible for creating the turbulence in flow of fluid. In this work experiment is carried out to enhance the heat transfer coefficient with installing delta winglet type of vortex generator in tube in tube type heat exchanger. These vortex generators are directly welded on internal side of tubes of tube in tube heat exchanger. These vortex generator causes stream wise longitudinal vortices in the tube which disrupt the growth of thermal boundary layer and enhance the heat transfer rate. Influence of geometrical parameter such as aspect ratio, winglet attack angle on heat transfer will be studied on rectangular, square, triangular and delta type winglet vortex generator and also pressure drop is calculated to find out the effect of it on heat transfer rate. Air is taken as working fluid, the flow regime is assumed to be laminar. By varying the above parameter the heat transfer coefficient will be calculated and by comparing all result optimum Dimension of winglet will be achieved.

Keywords: Winglet attack angle, vortex generator, delta winglet, rectangular winglet, square winglet, triangular winglet.