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Experimental Study of Drop Impact on Deep-Water Surface in the Presence of Wind

机译：有风时跌落冲击深水表面的实验研究

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摘要

The effects of wind on the impact of a single water drop on a deep-water surface are studied experimentally in a wind tunnel. Experiments are performed by varying impacting drop diameters, ranging from 2.5 to 4.1 mm and wind speeds up to 6.7 m s(-1). The sequence of splashing events that occurred during drop impacts is recorded with a backlit, cinematic shadowgraph technique. The experimental results show that for low wind speeds, an asymmetrical crown forms on the leeward of the periphery of the colliding region after the drop hits the water surface, while a wave swell forms on the windward. Secondary droplets are generated from the crown rim. For high wind speeds with large drop diameters, ligaments are generated from the crown rim on the leeward of the drop impact site. The ligaments grow, coalesce, and fragment into secondary droplets. It is found that both the drag force and surface tension play important roles in the evolution process of the ligaments. The nondimensional K number (K = WeOh(-0.4), where We is the Webber number and Oh is the Ohnesorge number) is used to describe the splashing-deposition limit of drop impact. The threshold value of this K number changes with the wind velocity and/or drop impact angle.
机译：在风洞中通过实验研究了风对单个水滴对深水表面影响的影响。通过改变冲击液滴直径（范围从2.5到4.1 mm，风速高达6.7 m s（-1））来进行实验。跌落冲击过程中发生的飞溅事件的顺序是使用背光的电影阴影图技术记录的。实验结果表明，对于低风速，在水滴撞击水面后，在碰撞区域外围的背风上会形成一个不对称的冠状结构，而在迎风面上会形成波浪形的凸起。从胎冠边缘产生二次液滴。对于具有较大液滴直径的高风速，从液滴撞击部位的背风处的冠缘产生韧带。韧带生长，聚结并破碎成次级液滴。发现拖曳力和表面张力在韧带的演变过程中都起着重要作用。无量纲K数（K = WeOh（-0.4），其中We是Webber数，Oh是Ohnesorge数）用于描述跌落冲击的飞溅沉积极限。该K数的阈值随风速和/或落下冲击角而变化。

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  • 来源
    《Journal of Physical Oceanography》 |2018年第2期|329-341|共13页
  • 作者

    Liu Xinan;

  • 作者单位

    Univ Maryland, Dept Mech Engn, College Pk, MD 20742 USA;

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