ABSTRACT

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.

中文翻译：

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圆形和椭圆形射流冲击平面和凹面的传热特性

摘要

本论文报告了平面和弯曲表面的热行为，采用相同等效直径 (d _e ) 的圆形和椭圆形喷嘴冲击射流。测试的雷诺数在 11,250–22,500 之间变化，板到喷嘴距离的变化范围 ( z/d  = 1–6)，不同的喷嘴纵横比 ( AR  = 1–4)。本研究讨论了平面和凹面 ( d/D  = 0.05) 之间的热行为比较。 对于平面和曲面，随着AR = 1 到 4的增加，停滞努塞尔数的最大增强分别为 27.4% 和 24.8% 。