High speed camera investigation of the impingement of single water droplets on oxidized high temperature surfaces
High speed camera investigation of the impingement of single water droplets on oxidized high temperature surfaces
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DOI：
10.1016/j.ijthermalsci.2012.07.014
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发表时间：
2013
影响因子：
4.5
通讯作者：
E. Negeed;S. Hidaka;M. Kohno;Y. Takata
中科院分区：
文献类型：
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作者：
E. Negeed;S. Hidaka;M. Kohno;Y. Takata
利用高速摄影技术研究了高温表面氧化层对单液滴撞击高温表面行为的影响。本文建立了一套实验装置，对单分散水滴在不同氧化层厚度（4.5，6.7，9.4和12.6 μm）下与固体热表面的直接接触进行了实验研究。液滴的大小和速度是独立控制的。研究了表面氧化层、液滴速度、液滴尺寸和表面过热度对热固液接触润湿时间和液滴在热表面上最大铺展直径的影响。给出了描述单个液滴撞击加热表面的流体动力学特征的经验关联式，并隐藏了该过程中表面氧化现象的影响参数。同时，将氧化现象下的计算结果与非氧化现象下的计算结果进行了比较，表明了表面氧化现象对单液滴撞击高温表面行为的影响。这些实验观察提供了通过计算流体动力学（CFD）（例如流体体积（VOF）建模）方法对这些现象进行多相建模所需的验证数据。
This study investigates the influence of oxide layer over the hot surfaces on the behavior of single droplets impacting the high temperature surfaces using high speed camera. In the present work, an experimental apparatus was installed where direct contact between mono-dispersed water droplet and solid hot surface in the presence of different values of oxide layer (4.5, 6.7, 9.4 and 12.6 μm) over the hot surface was experimentally investigated. The droplets size and its velocity were controlled independently. The results presented the effects of surface oxide layer, droplet velocity, droplet size and surface superheating on the hot solid–liquid contact wettability time and on the maximum droplet spread diameter on the hot surface. Empirical correlations are presented describing the hydrodynamic characteristics of an individual droplet impinging on a heated surface and concealing the affecting parameters for surface oxidation phenomena in such process. Also, the comparison between the obtained results at oxidation phenomena and the results due to others at non oxidation phenomena shows the effect of surface oxidation phenomena on the behavior of single droplet impacting the high temperature surface. These experimental observations provide the validation data required for multi-phase modeling of these phenomena by computational fluid dynamics (CFD) (e.g. Volume of Fluid (VOF) modeling) methods.