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首页> 外文期刊>International Journal of Heat and Mass Transfer >Local heat transfer distribution on a smooth flat plate impinged by a slot jet
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Local heat transfer distribution on a smooth flat plate impinged by a slot jet

机译：受狭缝射流撞击的光滑平板上的局部传热分布

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摘要

Experimental investigation of local heat transfer distribution on a smooth flat plate impinged by a normal slot jet is conducted. Present study concentrates on the influence of jet-to-plate spacing (z/b) and Reynolds number on the fluid flow and heat transfer distribution. A single slot jet with an aspect ratio (l/b) of about 50 is chosen to get the fully developed flow at the nozzle exit. Reynolds number based on slot width is varied from 4200 to 12,000 and jet-to-plate spacing (z/b) is varied from 0.5 to 12. The local heat transfer coefficients are estimated from the thermal images obtained from infrared thermal imaging camera. Measurement for the static wall pressure is carried out for various jet-to-plate spacings at a Reynolds number of 12,000. Normalized value of turbulence and velocity are measured using hot wire anemometer along the streamwise direction (x/b) for jet-to-plate spacings (z/b) of 1, 2, 4, 6, 8, 10 and 12. The entire flow field is divided into three regimes namely stagnation region (laminar boundary layer associated with favorable pressure gradient), transition region (associated with increase in turbulence intensities and heat transfer) and turbulent wall jet region. Semi-empirical correlation for the Nusselt number in the stagnation region is proposed. Heat transfer characteristics in the transition region are explained based on the fluid dynamic behavior from the hot wire measurements. Semi-empirical correlation for the Nusselt number in the wall jet region is presented using the velocity profile obtained from the hot wire measurements.
机译：在正常狭缝射流撞击的光滑平板上进行局部传热分布的实验研究。目前的研究集中在射流板间距（z / b）和雷诺数对流体流动和传热分布的影响上。选择纵横比（l / b）约为50的单缝射流，以在喷嘴出口获得完全展开的流量。基于缝隙宽度的雷诺数在4200到12,000之间变化，射流到印版的间距（z / b）在0.5到12之间变化。局部传热系数是根据从红外热像仪获得的热图像估算的。在雷诺数为12,000的情况下，对各种喷射到板的间距进行静态壁压的测量。使用热线风速计沿流向（x / b）测量湍流和速度的归一化值，以测得板，板之间的射流间距（z / b）为1、2、4、6、8、10和12。流场分为三个区域，即停滞区域（与有利的压力梯度相关的层状边界层），过渡区域（与湍流强度和传热的增加相关）和湍流壁射流区域。提出了停滞区域中努塞尔特数的半经验相关性。基于热线测量中的流体动力学行为来解释过渡区域中的传热特性。使用从热线测量获得的速度分布图，显示壁面射流区域中Nusselt数的半经验相关性。

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