Abstract

The dynamics of a cavity formed in the intrusive mode of coalescence of a freely falling drop flowing smoothly into a liquid have been traced for the first time by the methods of photo and video registration. The cavity begins to form when the bottom part of the drop submerges, when the fluid coalescence line contracts to the center of the flow, and, simultaneously with the annihilation of the drop surface, the surface of the target liquid is restored. In this case, the orientation of ligaments (thin trickles), formed in the vicinity of the contact line changes. At the initial phase, they are directed outward and distribute the transmitted momentum and energy of the drop over the entire surface of the intrusion. Retraction of the coalescence line holds the transmitted energy and momentum of the drop in the contact patch. If the kinetic energy of the falling drop noticeably exceeds the potential surface energy, the cavity begins to form at the initial contact of the fluids and deepens in the course of the entire coalescence process, capturing the drop matter.

中文翻译：

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自由下落液滴与目标液体结合的侵入模式下腔体形成的延迟

摘要

通过照相和视频配准的方法首次追踪了以自由落入的液滴的聚结的侵入模式结合而形成的空腔的动力学，该液滴自由地平稳地流入液体中。当液滴的底部浸没时，当流体的聚结线收缩到流的中心时，开始形成空腔，并且与液滴表面的simultaneously灭同时，恢复了目标液体的表面。在这种情况下，在接触线附近形成的韧带（细流）的方向发生变化。在初始阶段，它们被定向到外部，并在侵入的整个表面上分布传递的动量和液滴的能量。聚结线的缩回可保持传输能量和接触斑块中液滴下降的动量。