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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Heat transfer characteristics of a planar water jet impinging normally or obliquely on a flat surface at relatively low Reynolds numbers
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Heat transfer characteristics of a planar water jet impinging normally or obliquely on a flat surface at relatively low Reynolds numbers

机译：以相对较低的雷诺数正常或倾斜撞击平面的平面水射流的传热特性

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摘要

The heat transfer characteristics of a planar free water jet normally or obliquely impinging onto a flat substrate were investigated experimentally. The planar jet issued from a rectangular slot nozzle with a cross section of 1.62 mm x 40 mm. The mean velocity at the nozzle exit ranged from 1.5 to 6.1 m s(-1). The corresponding Reynolds number range based on the nozzle gap and the mean velocity was 2200-8800. Constant heat-flux conditions were employed at the solid surface. Various impingement angles between the vertical planar jet and the inclined solid surface were investigated: 90 degrees (normal collision), 70 degrees, 60 degrees, and 50 degrees. In the case of normal collisions, the Nusselt number is high at the impingement line, and decreases with departures from it. The stagnation Nusselt numbers were compared to the predictions of several correlations proposed by other researchers. In oblique collisions, the profiles of the local Nusselt numbers are asymmetric. The locations of the peak Nusselt numbers do not coincide with the geometric center of the planar jet on the surface.
机译：实验研究了正常或倾斜撞击到平面基板上的平面自由水射流的传热特性。由矩形狭缝喷嘴发出的平面射流，其横截面为1.62 mm x 40 mm。喷嘴出口处的平均速度为1.5至6.1 m s（-1）。基于喷嘴间隙和平均速度的相应雷诺数范围为2200-8800。在固体表面采用恒定的热通量条件。研究了垂直平面射流与倾斜固体表面之间的各种碰撞角度：90度（法向碰撞），70度，60度和50度。在正常碰撞的情况下，努塞尔特数在撞击线上较高，并且随着偏离而减小。将停滞的Nusselt数与其他研究人员提出的几种相关性的预测进行了比较。在倾斜碰撞中，局部Nusselt数的轮廓是不对称的。努塞尔峰峰值的位置与表面上平面射流的几何中心不一致。

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