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首页> 外文期刊>Journal of Fluid Mechanics >Levitation of a drop over a film flow
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Levitation of a drop over a film flow

机译:悬浮在薄膜流上

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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 ml) 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.
机译:垂直喷射在水平表面上的水会产生径向的薄膜流,然后产生圆形的水力跳动。我们报告了一种现象,在液滴和薄膜流动之间的薄空气层上,相当大的液滴(1毫升)悬浮在跃迁的上游。我们使用润滑理论来解释这种现象。气膜和水膜中的轴承作用似乎对于支撑大液滴是必要的。液压跳跃为下落提供了水平支撑。根据液滴的体积和液体性质,观察到各种液滴形状。我们表明,由于重力,表面张力,粘度和惯性而产生的力的相互作用产生了这些各种形状。

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