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A numerical study on the heat transfer characteristics of two-dimensional inclined impinging jet

机译:二维倾斜撞击射流传热特性的数值研究

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A two-dimensional numerical study has been applied to predict the heat transfer rate in the turbulence, unconfined, and submerged impinging jet discharged from a slot nozzle to flat and inclined plate by using commercial finite volume code FLUENT. The Reynolds in range of 4000-16000, the nozzle exit-to-plate spacing (H/D) in the range of 4-10 and inclination angle of air jet and plate in range of 40-90 has been considered. The constant heat flux of 100 w / m/sup 2/ was set to impinging plate. Two k-/spl epsiv/ RNG and Reynolds stress models by using the Enhanced Wall Treatment were used in all cases and local Nusselt number on the impinging jet plate was compared with experimental results. The Enhanced Wall Treatment by solving the fully turbulence region and viscous sublayer and using a single function improves effect of pressure gradients and thermal effects. The heat transfer rate in flat plate impinging jet in stagnation point is in its maximum value and then decreases along the wall. In the inclined impinging jet by movement of the stagnation point to uphill side maximum heat transfer rate location moves to uphill side of the plate but decreasing of Nusselt number is more gradually in downhill side. The numerical results predict the heat transfer rate in flat plate impinging jet by less than 10% difference in comparison with experiments however for inclined impinging jet in different HID, the prediction shows 5-20% difference.
机译:二维数值研究已应用商业有限体积代码FLUENT预测了从狭缝喷嘴排放到平坦和倾斜板上的湍流,无侧限和浸没式冲击射流中的传热速率。雷诺数在4000-16000范围内,喷嘴出口到印版的间距(H / D)在4-10的范围内,空气喷嘴和印版的倾斜角度在40-90的范围内。将100 w / m / sup 2 /的恒定热通量设置在撞击板上。在所有情况下,均使用通过增强壁处理的两个k- / spl epsiv / RNG和雷诺应力模型,并将撞击射流板上的局部Nusselt数与实验结果进行了比较。通过解决完全湍流区域和粘性子层并使用单个功能,可增强墙面处理,从而改善压力梯度和热效应的效果。平板冲击射流在滞流点处的传热速率达到最大值,然后沿壁减小。在停滞点向上坡侧移动的倾斜冲击射流中,最大传热率位置向板的上坡侧移动,但是在下坡侧,努塞尔数的减少更加缓慢。数值结果预测平板冲击射流的传热率与实验相比,相差不到10%,但是对于不同HID的倾斜冲击射流,预测显示相差5-20%。

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