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首页> 外文期刊>ISIJ international >Heat Transfer Characteristics of a Circular Water Jet Impinging on a Moving Hot Solid
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Heat Transfer Characteristics of a Circular Water Jet Impinging on a Moving Hot Solid

机译：圆形水射流撞击移动的热固体的传热特性

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The heat transfer characteristics of a circular water jet impinging on a moving hot solid were investigated experimentally. In the experiments, distilled water at room temperature was used as the test coolant. The circular jet issued from a 5-mm-diameter pipe nozzle, fell vertically downward, and impinged on a horizontal moving sheet made of 0.3-mm-thick stainless steel. The initial temperature of the sheet, the jet velocity, and the moving sheet velocity were varied systematically. The initial temperature of the moving sheet was set to 100, 150, 200, or 250°C. The mean velocity at the nozzle exit was 0.4, 0.8, or 1.2 m/s, and the moving velocity was 0.5, 1.0, or 1.5 m/s. Observations made using flash photography and thermography showed that the location of the front edge of the liquid film formed upstream of the jet impact point depends on all of these factors. The local heat flux is very small in the dry area, increases steeply near the front edge of the liquid film, and reaches a peak. If the distance between the front edge of the liquid and the jet impact point is relatively large, a second peak appears near the jet impact point. An experimental correlation was developed for predicting peak heat fluxes near the front edge of the liquid, although it has no theoretical background. The correlation agrees moderately well with the experiments.
机译：实验研究了圆形射流撞击在运动的热固体上的传热特性。在实验中，室温下的蒸馏水用作测试冷却剂。由直径为5毫米的管嘴发出的圆形射流垂直向下下落，并撞击在由0.3毫米厚的不锈钢制成的水平移动板上。纸张的初始温度，喷射速度和移动的纸张速度会系统地变化。活动片的初始温度设定为100、150、200或250℃。喷嘴出口处的平均速度为0.4、0.8或1.2 m / s，移动速度为0.5、1.0或1.5 m / s。使用闪光灯摄影和热成像的观察结果表明，在射流冲击点上游形成的液膜前边缘的位置取决于所有这些因素。在干燥区域中，局部热通量非常小，在液膜的前边缘附近急剧增加，并达到峰值。如果液体的前边缘与射流冲击点之间的距离相对较大，则在射流冲击点附近会出现第二个峰值。尽管没有理论背景，但开发了一种实验相关性来预测靠近液体前缘的峰值热通量。相关性与实验适度吻合。

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