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arXiv 2101.05096physics.flu-dyn
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粗糙表面上的液滴飞溅

Droplet Splashing on Rough Surfaces

T. C. de Goede, K. G. de Bruin, N. Shahidzadeh, D. Bonn

摘要:

当液滴撞击表面足够快时,可能会发生液滴飞溅:较小的次级液滴在撞击过程中与主液滴分离。虽然液滴在光滑表面上的飞溅现在已经很好地理解,但表面粗糙度也影响液滴飞溅的冲击速度。在这项研究中,表面粗糙度对液滴飞溅的影响进行了研究。通过改变冲击表面的均方根粗糙度,我们发现,只有当液滴粗糙度大到足以破坏扩展液滴薄层,并改变液滴飞溅机制从电晕迅速飞溅时,液滴飞溅速度的影响。最后,使用Weber和Ohnesorge数标度模型,我们还表明,水和乙醇在不同粗糙度和水-乙醇混合物的表面上测量的飞溅速度崩溃到一个单一的曲线上,表明粗糙表面上的液滴飞溅速度与表面粗糙度长度尺度定义的Ohnesorge数标度。

英文摘要:

When a droplet hits a surface fast enough, droplet splashing can occur: smaller secondary droplets detach from the main droplet during impact. While droplet splashing on smooth surfaces is by now well understood, the surface roughness also affects at which impact velocity a droplet splashes. In this study, the influence of the surface roughness on droplet splashing is investigated. By changing the root mean square roughness of the impacted surface, we show that the droplet splashing velocity is only affected when the droplet roughness is large enough to disrupt the spreading droplet lamella and change the droplet splashing mechanism from corona to prompt splashing. Finally, using Weber and Ohnesorge number scaling models, we also show that the measured splashing velocity for both water and ethanol on surfaces with different roughness and water-ethanol mixtures collapse onto a single curve, showing that the droplet splashing velocity on rough surfaces scales with the Ohnesorge number defined with the surface roughness length scale.

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