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首页> 外文会议>ESAFORM conference on material forming >Influence of the impact angle and the gravity direction on heat transfer during the cooling of a cylinder by a free planar subcooled impinging jet
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Influence of the impact angle and the gravity direction on heat transfer during the cooling of a cylinder by a free planar subcooled impinging jet

机译：自由平面过冷冲击射流在气缸冷却过程中冲击角和重力方向对传热的影响

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Cooling from impinging jet is nearly compulsory in steel industry processing especially in Run Out Table processing and steel tubes production because of the high heat transfer rates provided by the boiling of the subcooled water jet. As far as metallurgical phase transformations, residual stresses and deformations in the workpiece are concerned, the temperature drop during cooling must be perfectly controlled thanks to a fully understanding of the heat transfer mechanisms. In a previous study [1] the effect of surface to jet velocity ratio on heat transfer has been characterized and it has been shown that this parameter has a significant influence on shoulder of flux collapse. In order to understand the effect of more industrial quench process parameters, an innovative experimental quenching device has been designed and built. It allowed us to make heat transfer measurements at the surface of a hot nickel cylinder impinged by a subcooled water jet, according to several angles of impact and three jet directions against gravity. The results clearly highlight an effect of these two parameters on the heat transfer mechanisms at the surface of the tube. These results allow a better understanding of the origins of temperature heterogeneities inside the tube during the quench.
机译：由于过冷水射流的沸腾提供了很高的传热率，因此在钢铁行业的加工中，特别是在跳出台加工和钢管生产中，撞击射流的冷却几乎是强制性的。至于冶金相变，工件中的残余应力和变形，由于对传热机理的充分理解，必须完美控制冷却过程中的温度下降。在先前的研究中[1]，已经表征了表面速度与射流速度之比对热传递的影响，并且已经表明，该参数对通量坍塌的肩部有重要影响。为了了解更多工业淬火工艺参数的影响，已经设计并制造了一种创新的实验淬火装置。它使我们能够根据几个冲击角和三个相对重力的射流方向，对被过冷水射流撞击的热镍圆柱体的表面进行传热测量。结果清楚地表明了这两个参数对管子表面传热机制的影响。这些结果可以更好地了解淬火过程中管内温度异质性的起因。

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