Experimentation using delta winglet type vortex generator attached on tube surface of tube in tube heat exchanger for heat transfer augmentation

mechanical engineering

The Vortex generator is responsible for creating the turbulence in flow of fluid. Delta winglet type vortex generator is used enhance the heat transfer rate in tube in tube heat exchanger. The vortex generators are directly welded on internal side of tubes of tube in tube heat exchanger, which results in to 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 is studied on rectangular, square, triangular and delta type winglet vortex generator and pressure drop is also calculated to find out the effect 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 is calculated and compares all result optimum Dimension of winglet is selected. From the experimentation, delta winglet type vortex generator with size 15mm x 20mm with 30° attack angle has high heat transfer coefficient and high heat transfer rate as compared with other types of winglet vortex generator.

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