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Hydrodynamics of a Submerging Drop: Immiscible Liquids
Fluid Dynamics ( IF 0.9 ) Pub Date : 2020-03-01 , DOI: 10.1134/s0015462820020056
A. Yu. Il’inykh , Yu. D. Chashechkin

Abstract The patterns of mass transfer of aqueous-ink-solution drops of 0.2 and 0.5 cm in diameter which fall freely into vegetable oil are investigated by means of macrophoto and high-speed video techniques over the range of the height of fall from 25 to 65 cm. The double layer formed by the contacting surfaces affects the flow pattern in the drop submerging phase. In this layer a part of the available potential surface energy of fluids is converted into other forms. The geometries of the chevron consisting of oil and the drop mass distribution pattern over the inner crown surface turn out to be similar in the initial flow phase. With time, the cavity and splash shapes and the drop mass distribution patterns that depend on time and the distance of drop fall (drop contact velocity) differ significantly. With the beginning of collapse, the ink-free regions (so-called voids) and outlined by thin filaments of drop matter are formed on the inner crown surface. Then, the filaments disintegrate into fine droplets. The geometry of splashes including those reaching the maximum height over the parameter range considered is traced.

中文翻译:

水滴的流体动力学:不混溶的液体

摘要 利用宏观摄影和高速视频技术,研究了直径为 0.2 cm 和 0.5 cm 的水性墨水液滴在植物油中自由落下的传质模式,在 25 至 65 的落差范围内。厘米。由接触表面形成的双层影响液滴浸没阶段的流动模式。在该层中,一部分可用的流体潜在表面能被转化为其他形式。在初始流动阶段,由油组成的 V 形几何形状和内冠表面上的液滴质量分布模式结果是相似的。随着时间的推移,空腔和飞溅形状以及取决于时间和液滴下落距离(液滴接触速度)的液滴质量分布模式显着不同。随着崩溃的开始,无墨区域(所谓的空隙)和由液滴物质细丝勾勒的轮廓形成在内冠表面上。然后,细丝分解成细小的液滴。飞溅的几何形状,包括在所考虑的参数范围内达到最大高度的飞溅几何形状被追踪。
更新日期:2020-03-01
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