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首页> 外文期刊>International Journal of Heat and Mass Transfer >Entrapment of air at 45° oblique collision of a water drop with a smooth solid surface at room temperature
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Entrapment of air at 45° oblique collision of a water drop with a smooth solid surface at room temperature

机译：在室温下，水滴以45°倾斜碰撞时与光滑的固体表面发生夹带

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摘要

This paper treats the oblique impact of a water drop onto a smooth optical glass surface at room temperature. The impact angle between the incoming drop and the surface is 45°. The preimpact diameter of spherical drops is 2.55 mm. The time evolution of the water/solid direct contact area is observed from the reverse side of the impact surface by a flash-photographic technique. It is found that the drop directly contacts the solid surface in a ring shape, and some air is entrapped between the bottom of the drop and the solid surface. Thereafter, a bubble is formed at the impact point. For the case of impact velocity at 1.31 m/s, a fingering pattern is developed from within a ring-shaped wet area, then satellite bubbles in a ring are formed around the bubble at the impact point. No satellite bubble is observed for the case of a higher impact velocity ( = 2.11 m/s).
机译：本文在室温下处理水滴对光滑光学玻璃表面的倾斜影响。进入的液滴与表面之间的冲击角为45°。球形液滴的预撞击直径为2.55毫米。通过闪光照相技术从冲击表面的反面观察到水/固体直接接触区域的时间演变。发现液滴直接以环形接触固体表面，并且一些空气截留在液滴的底部和固体表面之间。此后，在冲击点处形成气泡。对于冲击速度为1.31 m / s的情况，指状图案是从环形湿区内部形成的，然后在冲击点周围的气泡周围形成环形的卫星气泡。对于较高的撞击速度（= 2.11 m / s），没有观察到卫星气泡。

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