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首页> 外文期刊>ISIJ international >Heat Transfer Characteristics of a Pipe-laminar Jet Impinging on a Moving Hot Solid
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Heat Transfer Characteristics of a Pipe-laminar Jet Impinging on a Moving Hot Solid

机译：层流射流撞击热固体的传热特性

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摘要

This study experimentally investigated the hydrodynamics and heat transfer characteristics of a circular water jet impinging on a moving hot metal sheet as fundamental research on pipe-laminar cooling. The circular jet was issued from a 5-mm-diameter pipe nozzle. A 0.3-mm-thick sheet made of stainless steel was adopted as the test sheet. In the experiment, the liquid flow formed by the jet impingement was observed by flash photography, and the temperature profile on the underside of the moving sheet was measured by infrared thermography. The initial temperature of the moving solid was varied from 100°C to 500°C. The mean velocity at the nozzle exit ranged between 0.4 m/s and 1.2 m/s. The moving velocity of the solid was set to less than or equal to 1.5 m/s. The estimated heat flux profile on the cooled surface was found to be strongly dependent on the initial temperature of the sheet. When the initial temperature of the sheet was relatively low, a bow-shaped high heat flux region appeared in the upstream of the jet impact point. At higher temperatures, the heat flux area existed only in the jet impact regions. The heat flux increased with increasing initial sheet temperature, reached peak values, and then decreased drastically. The sharp decrease in the heat flux, which was due to the formation of a vapor layer, was influenced by the jet velocity and/or the sheet velocity.
机译：这项研究通过实验研究了撞击在运动的热金属板上的圆形水射流的流体动力学和传热特性，以此作为管层冷却的基础研究。圆形射流是从直径为5毫米的管嘴发出的。试验片采用不锈钢制的厚度为0.3mm的片。在该实验中，通过闪光照相观察由射流冲击形成的液体流，并通过红外热像法测量移动片材下侧的温度分布。移动固体的初始温度在100℃至500℃之间变化。喷嘴出口处的平均速度在0.4 m / s和1.2 m / s之间。固体的移动速度设置为小于或等于1.5 m / s。发现冷却表面上的估计热通量轮廓强烈地取决于片材的初始温度。当片的初始温度相对较低时，在射流冲击点的上游出现弓形的高热通量区域。在较高温度下，热通量区域仅存在于射流冲击区域。热通量随着初始纸页温度的升高而增加，达到峰值，然后急剧下降。由于蒸汽层的形成，热通量的急剧下降受到喷射速度和/或片材速度的影响。

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