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首页> 外文期刊>Journal of Heat Transfer >Effect of the Inlet Geometry on the Flow and Heat Transfer Characteristics of Three-Dimensional Wall Jets
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Effect of the Inlet Geometry on the Flow and Heat Transfer Characteristics of Three-Dimensional Wall Jets

机译：入口几何形状对三维壁面射流的流动和传热特性的影响

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摘要

In this work, fluid flow and heat transfer characteristics of three-dimensional (3D) wall jets exiting from a circular and square opening are presented based on experimental investigations. Two hydraulic diameters, namely, 2.5 and 7.5mm and a Reynolds number range of 5000-20,000 have been considered. Mean velocity and turbulence intensity distribution in the walljet are quantified using a hot wire anemometry. Measurements are done both along the streamwise and spanwise directions. Transient infrared thermography is used for mapping the temperatures over the surface, and the heat transfer coefficients are estimated using a semi-infinite approximation methodology. Results show that, for circular jets, the effect of the jet diameter on the local and the spanwise-averaged Nusselt number is most pronounced near the jet exit. Further, it is also observed that circular jets have an edge over square jets. A correlation with a high correlation coefficient of 0.95 has been developed for spanwise average Nusselt number as a function of the Reynolds number and the dimensionless streamwise distance.
机译：在这项工作中，基于实验研究，提出了从圆形和方形开口流出的三维（3D）壁面射流的流体流动和传热特性。已经考虑了两个液压直径，即2.5和7.5mm，雷诺数范围为5000-20,000。使用热线风速仪对壁式射流中的平均速度和湍流强度分布进行定量。沿流向和跨度方向均进行测量。瞬态红外热成像技术用于绘制表面温度，并使用半无限近似方法估算传热系数。结果表明，对于圆形射流，射流直径对局部和翼展平均Nusselt数的影响在射流出口附近最为明显。此外，还观察到圆形射流在方形射流上具有边缘。对于翼展方向平均努塞尔数，作为雷诺数和无因次流向距离的函数，已经开发出具有0.95的高相关系数的相关性。

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