Splash Formation by a Spherical Body Plunging into Water
Splash Formation by a Spherical Body Plunging into Water
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DOI：
10.1007/bf03181877
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发表时间：
2009-10-01
影响因子：
1.7
通讯作者：
Mochizuki, O.
中科院分区：
文献类型：
--
作者：
Kubota, Y.;Mochizuki, O.
利用高速CMOS摄像机对球形物体入水飞溅进行了实验研究。我们根据球体的撞击速度对飞溅类型进行了分类。发现了三种类型的飞溅：I型是薄的螺旋型飞溅，II型是具有许多液滴的蘑菇型飞溅，以及III型是具有许多液滴的冠型飞溅。附着在下沉球体上的凹水面的反作用力是I型飞溅的原因。膜流沿球壁向上爬升是引起II型飞溅的主要原因。膜流的速度与球体的冲击速度成比例，影响膜流的指状物、液滴的分离和II型飞溅的最大高度。III型冠状飞溅的特征在于具有许多液滴的水射流。在下沉的球体后面形成了一个庞大的空气柱，并观察到空气柱表面上的纵向脊和波纹。
Splashes caused by a spherical body plunging into water were investigated experimentally using a high speed CMOS camera. We categorized types of splash according to impact velocities of the sphere. Three types of splash were found: Type-I is a thin spire-type splash, Type-II is a mushroom-type splash with many droplets, and Type-III is a crown-type splash with many droplets. The reaction to the concave water surface attached to the sinking sphere is a cause of the Type-I splash. The film flow climbing up the sphere is a dominant cause of the Type-II splash. The velocity of the film flow, which is proportional to the impact velocity of the sphere, affects the fingers of the film flow, detaching of droplets, and maximum height of the Type-II splash. The Type-III crown-type splash is characterized by water jets with many droplets. A bulky air column in water is formed behind the sinking sphere, and longitudinal ridges and ripples on the surface of the air column were observed.