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首页> 外文期刊>Journal of Heat Transfer >Effect of Slot Jet Temperature on Impingement Heat Transfer Over a Heated Circular Cylinder
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Effect of Slot Jet Temperature on Impingement Heat Transfer Over a Heated Circular Cylinder

机译：狭缝射流温度对加热圆柱上冲击传热的影响

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摘要

In this paper, heat transfer and effectiveness of a turbulent slot jet impinging over a heated circular cylinder have been investigated numerically by varying the ratio of jet temperature to the ambient temperature, Θ _( j )  = T _( j ) /T _( amp ) , from 0.7 to 1.2. In all cases, the ambient temperature (T _( amb ) ) is assumed to be constant (300 K). The Reynolds number defined based on the average nozzle exit velocity, the diameter of the cylindrical target (D), and properties at the nozzle exit temperature, R e D = ρ V D / μ is varied from 6000 to 20,000. The ratio of cylinder diameter to the slot width, D/S = 5.5, 8.5, and 17 are considered and the nondimensional distance from the nozzle exit to the cylinder, H/S is varied in the range of 2 ≤ H/S ≤ 12. The v ′ 2 ¯ − f turbulence model was used for numerical simulations. Numerical results reveal that the local Nusselt number is found to be higher at the stagnation point in the case of cold jet impingement at Θ _( j )  = 0.7. The local heat transfer at the rear side of the cylinder is 8–18% less as compared to that of Θ _( j )  = 1.0 for Re _( D )  = 6000. The local effectiveness calculated over a circular cylinder strongly depends on H/S and D/S. Based on the parametric study, a correlation has been provided for the local effectiveness at the stagnation point.
机译：在本文中，通过改变射流温度与环境温度的比值Θ_（j）= T _（j）/ T _（ amp），从0.7到1.2。在所有情况下，都假定环境温度（T _（amb））恒定（300 K）。基于平均喷嘴出口速度，圆柱形目标的直径（D）和喷嘴出口温度下的特性R e D =ρV D /μ定义的雷诺数在6000到20,000之间变化。考虑圆柱直径与缝隙宽度的比率D / S = 5.5、8.5和17，从喷嘴出口到圆柱的无量纲距离H / S在2≤H / S≤12的范围内变化v'2¯-f湍流模型用于数值模拟。数值结果表明，在冷喷射撞击Θ_（j）= 0.7的情况下，在滞止点处的局部Nusselt数更高。与Re _（D）= 6000的Θ_（j）= 1.0相比，圆柱后侧的局部传热要少8–18％。 / S和D / S。基于参数研究，已为停滞点的局部有效性提供了相关性。

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