Abstract The present study investigates numerically the effect of wall undulation on the thermo-hydraulic transport characteristics of turbulent jet. In order to explore the influence of position of the nozzle exit from the wall, both wall jet and offset jet are considered. The theoretical model is numerically solved using shear stress transport (SST) model to predict the effects of height of undulation of the wall and the offset jet ratio on the re-attachment length, the velocity profile at different downstream locations, the coefficient of friction and the Nusselt number. The results indicate that the undulation of wall has a strong influence in altering the friction coefficient, Nusselt number and re-attachment length for offset jet. It further reveals that there is an intricate interplay between undulation height and offset ratio in dictating the flow and heat transfer characteristics.

中文翻译：

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波纹壁对湍流射流水动力和热传递特性的影响

摘要 本研究数值研究了壁面起伏对湍流射流热工水力输运特性的影响。为了探索喷嘴出口位置对壁面的影响，壁面射流和偏移射流都被考虑。理论模型使用剪切应力传输（SST）模型进行数值求解，以预测壁面起伏高度和偏移射流比对再附着长度、下游不同位置的速度分布、摩擦系数和努塞尔数。结果表明，壁面的起伏对偏移射流的摩擦系数、努塞尔数和再附着长度有很大影响。