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arXiv 1507.06131physics.flu-dyn
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液滴对倾斜流动液膜的影响

Impact of Droplets on Inclined Flowing Liquid Films

Zhizhao Che, Amandine Deygas, Omar K. Matar

摘要:

利用高速成像技术对液滴对倾斜下降液膜的撞击进行了实验研究。降膜是在平坦的基底上产生的,具有可控的厚度和流速。采用不同尺寸和速度的液滴,研究了不同Ohnesorge数、Weber数和液膜雷诺数下的液滴撞击过程。一些现象与液滴的影响进行了识别和分析,如弹跳,部分聚结,总聚结,飞溅。液滴的大小,速度,以及膜流率的影响进行了研究,最终产生的影响制度地图。对液滴通过气体层所受润滑力的分析表明,液膜中流速越大,润滑力越大,液滴的排液过程越慢,液滴弹跳的概率越大。我们的研究结果表明,流动的薄膜有深刻的影响,液滴的冲击过程和相关的现象,这是显着更复杂的比那些伴随着最初的静态膜的影响。

英文摘要:

The impact of droplets on an inclined falling liquid film is studied experimentally using high-speed imaging. The falling film is created on a flat substrate with controllable thicknesses and flow rates. Droplets with different sizes and speeds are used to study the impact process under various Ohnesorge and Weber numbers, and film Reynolds numbers. A number of phenomena associated with droplet impact are identified and analysed, such as bouncing, partial coalescence, total coalescence, and splashing. The effects of droplet size, speed, as well the film flow rate are studied culminating in the generation of an impact regime map. The analysis of the lubrication force acted on the droplet via the gas layer shows that a higher flow rate in the liquid film produces a larger lubrication force, slows down the drainage process, and increases the probability of droplet bouncing. Our results demonstrate that the flowing film has a profound effect on the droplet impact process and associated phenomena, which are markedly more complex than those accompanying impact on initially quiescent films.

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