Kamiar Zamzamian - Associate professor at Islamic Azad University of Tabriz, Department of Mechanical Engineering, Tabriz Branch, Islamic Azad University, Tabriz, I. R. Iran
Mohammad Mardani - Student at Islamic Azad University of Tabriz, Department of Mechanical Engineering, Tabriz Branch, Islamic Azad University, Tabriz, I. R. Iran

Effects of jet inlet geometry and Reynolds number on localand average heat transfer characteristics of two confinedimpinging jets have been investigated numerically by usinga 3D k-ε model. Simulations were performed for two jet exitgeometries including circular and rectangular jets fordimensionless jet to plate distances 2,6 10.As the Reynolds number increases, heat transferenhancement was obtained at stagnation region. As a resulthigher Reynolds number jets can be used as an enhancementtechnique for localized heating or cooling. Wall jet regioncomprises very large portion of the impinging plate understudy and generally lower heat transfer rates were attained inthis region. Also with increasing jet to plat distance , heattransfer enhancement was observed at stagnation point. withincreasing x value at wall jet region, very similar heattransfer characteristics were observed for two jets.

Confined impinging jets – stagnation region – heat transfer– turbulence model