The effects of the groove size on the dynamical and thermal behavior in a round jet impinging on an axisymmetric corrugated surface are investigated numerically. The geometry is similar to that considered in the experimental study Sagot et al. (2010, Inter J. Therm. Sci., 49, 1026–1030). Three side lengths of the square groove cross section are tested, 1/8, 1/4, and 3/8 of the jet diameter. A comparison is made with the flat plate case. The nozzle-to-plate distance is H = 2D, the Reynolds number is Re = 23000, and the ratio of the plate-radius to nozzle-diameter is R/D = 6. The SST k-ω model is employed to take account of turbulence effects. An attempt is made to understand thoroughly how key parameters such as mean velocity, turbulent kinetic energy, and temperature fields can influence the heat transfer performance. The local normal-to-wall temperature gradient and, thus, the local heat flux through the fluid/wall interface are strongly dependent on these parameters. This justifies our interest in analyzing the distributions of such determining factors in the wall jet and, particularly, in the recirculating zones inside the cavities. Their imprints on the friction coefficient and the local and averaged values of the Nusselt number are highlighted.

数值研究了沟槽尺寸对撞击在轴对称波纹表面上的圆形射流的动力学和热行为的影响。几何形状与实验研究Sagot等人所考虑的相似。（2010，国际J. Therm。Sci。，49，1026-1030）。测试方槽横截面的三个边长，分别为射流直径的1 / 8、1 / 4和3/8。与平板外壳进行了比较。喷嘴到板的距离为H = 2 D，雷诺数为Re = 23000，板半径与喷嘴直径的比为R / D =6。SST k - ω该模型用于考虑湍流效应。试图彻底了解关键参数（例如平均速度，湍动能和温度场）如何影响传热性能。局部法向壁温度梯度以及因此通过流体/壁界面的局部热通量强烈依赖于这些参数。这证明了我们有兴趣分析壁射流中，尤其是空腔内部的再循环区域中此类决定因素的分布。突出显示了它们在摩擦系数以及努塞尔特数的局部和平均值上的印记。