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The present paper reports the thermal behavior of flat and curved surfaces with impinging jets employing circular and elliptical nozzle for identical equivalent diameter (d e ). Tests are performed with the Reynolds number varying from 11,250–22,500, varied range of plate to nozzle distance ( z/d  = 1–6), various nozzle aspect ratios ( AR  = 1–4). A comparison of thermal behavior between flat and concave surfaces ( d/D  = 0.05) is discussed in this study. The maximum enhancement in the stagnation Nusselt number found to be 27.4% and 24.8% with the increase in  AR  = 1 to 4 for flat surface, curved surface, respectively.

Heat transfer characteristics of flat and concave surfaces by circular and elliptical jet impingement