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Direct-contact heat transfer of single droplets in dispersed flow film boiling: Experiment and model assessment
Nuclear Engineering and Technology ( IF 2.7 ) Pub Date : 2021-02-27 , DOI: 10.1016/j.net.2021.02.017
Junseok Park , Hyungdae Kim

Direct-contact heat transfer of a single saturated droplet upon colliding with a heated wall in the regime of film boiling was experimentally investigated using high-resolution infrared thermometry technique. This technique provides transient local wall heat flux distributions during the entire collision period. In addition, various physical parameters relevant to the mechanistic modelling of these phenomena can be measured. The obtained results show that when single droplets dynamically collide with a heated surface during film boiling above the Leidenfrost point temperature, typically determined by droplet collision dynamics without considering thermal interactions, small spots of high heat flux due to localized wetting during the collision appear as increasing Wen. A systematic comparison revealed that existing theoretical models do not consider these observed physical phenomena and have lacks in accurately predicting the amount of direct-contact heat transfer. The necessity of developing an improved model to account for the effects of local wetting during the direct-contact heat transfer process is emphasized.



中文翻译:

分散流膜沸腾中单个液滴的直接接触传热:实验和模型评估

使用高分辨率红外测温技术实验研究了单个饱和液滴在薄膜沸腾状态下与加热壁碰撞时的直接接触传热。该技术在整个碰撞期间提供瞬时局部壁热通量分布。此外,可以测量与这些现象的机械建模相关的各种物理参数。获得的结果表明,当单个液滴在高于莱顿弗罗斯特点温度的薄膜沸腾过程中与受热表面发生动态碰撞时,通常由液滴碰撞动力学决定,而不考虑热相互作用,碰撞过程中由于局部润湿而导致的高热通量小点出现随着增加我们ñ. 系统比较表明,现有的理论模型没有考虑这些观察到的物理现象,缺乏对直接接触传热量的准确预测。强调了开发改进模型以考虑直接接触传热过程中局部润湿影响的必要性。

更新日期:2021-02-27
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