Investigation about the effect of jet exit geometry in the heat transfer characteristics by numerical study

Effects of jet inlet geometry and Reynolds number on local heat transfer characteristics of two confined impinging jets have been investigated numerically by using a 3D k-ε model. Simulations were performed for two jet exit geometries including circular and elliptic jets for dimensionless jet to plate distances 2,6. As the Reynolds number increases, heat transfer enhancement was obtained at stagnation region. As a result higher Reynolds number jets can be used as an enhancement technique for localized heating or cooling. Wall jet region comprises very large portion of the impinging plate under study and generally lower heat transfer rates were attained in this region. Also with increasing jet to plat distance, heat transfer enhancement was observed at stagnation point. At wall jet region, very similar heat transfer characteristics were observed for two jets. With increasing jet to plate distance, heat transfer of elliptic jet is more efficient.