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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat transfer of impinging air and liquid nitrogen mist jet onto superheated flat surface
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Heat transfer of impinging air and liquid nitrogen mist jet onto superheated flat surface

机译：撞击的空气和液氮雾射流在过热平面上的传热

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摘要

This experimental study performs the detailed heat transfer measurements of an impinging air-liquid nitrogen mist jet onto a superheated flat surface at atmospheric pressure with reference to the design of an instant freezing facility. A selection of experimental results illustrates the interacting effects of jet Reynolds number, mass flow ratio of air to liquid nitrogen flows and separation distance on the spatial distributions of heat transfer over the impinging surface. Mechanism associated with phase change of impacting droplets generates an enhanced and uniformly distributed heat transfer region centered on the stagnation point. A narrow oval-ring region encapsulating the enhanced core transits heat transfer from the wetting regime of complete evaporation to the non-wetting rebound regime. Stagnation heat transfer augmentation factor in the range of 1.2-2.8 times of the air-jet level is achieved. An empirical correlation based on the experimental data, which is physically consistent, has been developed to permit the evaluation of stagnation heat transfer.
机译：这项实验研究参考速冻设备的设计，对在大气压力下撞击到过热的平坦表面上的气液氮雾喷射进行了详细的传热测量。一系列实验结果说明了射流雷诺数，空气与液氮流量的质量比以及分离距离对撞击表面传热空间分布的相互作用。与撞击液滴的相变相关的机制会产生一个以停滞点为中心的增强且均匀分布的传热区域。包裹增强核的狭窄椭圆形环区域将热量从完全蒸发的润湿状态转移到非润湿的反弹状态。停滞传热增加因子达到喷气水平的1.2-2.8倍。已经开发出基于实验数据的经验相关性，该相关性在物理上是一致的，以允许评估滞热传递。

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