Levitation of a drop over a film flow
Levitation of a drop over a film flow
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DOI：
10.1017/s0022112098003486
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发表时间：
1999-02-10
影响因子：
3.7
通讯作者：
Arakeri, JH
中科院分区：
文献类型：
--
作者：
Sreenivas, KR;De, PK;Arakeri, JH
垂直喷流冲击水平表面，产生径向膜流，然后是圆形水力跳跃。我们报告了一种现象，相当大(1英里)的液滴在液滴和薄膜流动之间的薄空气层上漂浮在跳跃的上游。我们用润滑理论解释了这一现象。气膜和水膜中的轴承作用对于支撑大液滴似乎是必要的。通过液压跳跃对落差进行水平支撑。根据液滴的体积和液体性质，可以观察到不同的液滴形状。我们表明，重力、表面张力、粘性和惯性的相互作用产生了这些不同的形状。
A vertical jet of water impinging on a horizontal surface produces a radial film flow followed by a circular hydraulic jump. We report a phenomenon where fairly large (1 mi) drops of liquid levitate just upstream of the jump on a thin air layer between the drop and the film flow. We explain the phenomenon using lubrication theory. Bearing action both in the air film and the water film seems to be necessary to support large drops. Horizontal support is given to the drop by the hydraulic jump. A variety of drop shapes is observed depending on the volume of the drop and liquid properties. We show that interaction of the forces due to gravity, surface tension, viscosity and inertia produces these various shapes.