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arXiv 1305.0403physics.flu-dyn
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跌落冲击浅水池时涡环的产生

Vortex ring generation during drop impact into a shallow pool

Andreas Wilkens, David Auerbach, GertJan van Heijst

摘要:

当液滴从中等高度落入深度为液滴半径量级的浅液池时,会产生两对涡环。内对形成于撞击液滴所产生的弹坑边缘,而外对则被传播波所切断。每对中的一个环是短暂的,而另一个持续存在。每个环都有一个可测量的非零环流(其符号与众所周知的深水水滴涡环相反),在波浪退去后很长时间内仍然存在。此外,在某些条件下,它们会发展出环涡的典型不稳定性。虽然环是很好的重现性,他们后来的发展方面是非常敏感的一些实验参数的变化。本文报告的实验区分这些滴生成环的可重复性方面,并记录其对材料和几何参数的依赖。

英文摘要:

When a drop falls from a moderate height into a shallow fluid pool whose depth is of the order of the drop-radius two pairs of vortex rings are generated. The inner pair forms at the edge of the crater created by the impacting drop while the outer pair is laid off from the spreading wave. One ring of each of these pairs is short-lived while the other persists. Each of the rings has a measureable non-zero circulation (whose sign, however, is opposite to that of the well-known deep-water drop vortex rings) which persists long after the wave has receded. Furthermore under certain conditions they develop instabilities typical to ring vortices. Although the rings are well reproducible, aspects of their later development are very sensitive to changes in some of the experimental parameters. This paper reports on experiments distinguishing reproducible aspects of these drop- generated rings and documenting their dependence on material and geometrical parameters.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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