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Drop impact into a deep pool: vortex shedding and jet formation

  • G. Agbaglah (a1), M.-J. Thoraval (a2) (a3), S. T. Thoroddsen (a2), L. V. Zhang (a1), K. Fezzaa (a4) and R. D. Deegan (a1)...

One of the simplest splashing scenarios results from the impact of a single drop on a deep pool. The traditional understanding of this process is that the impact generates an axisymmetric sheet-like jet that later breaks up into secondary droplets. Recently it was shown that even this simplest of scenarios is more complicated than expected because multiple jets can be generated from a single impact event and there are transitions in the multiplicity of jets as the experimental parameters are varied. Here, we use experiments and numerical simulations of a single drop impacting on a deep pool to examine the transition from impacts that produce a single jet to those that produce two jets. Using high-speed X-ray imaging methods we show that vortex separation within the drop leads to the formation of a second jet long after the formation of the ejecta sheet. Using numerical simulations we develop a phase diagram for this transition and show that the capillary number is the most appropriate order parameter for the transition.

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Journal of Fluid Mechanics
  • ISSN: 0022-1120
  • EISSN: 1469-7645
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Type Description Title

Agbaglah et al. supplementary movie
Numerical simulation showing the bumping regime for We=700 and Re=4000

 Video (1.1 MB)
1.1 MB

Agbaglah et al. supplementary movie
Numerical simulation showing the vortex shedding in the two jets regime for We=500 and Re=3500

 Video (1.2 MB)
1.2 MB

Agbaglah et al. supplementary movie
Numerical simulation showing a smooth one jet regime for We=700 and Re=500

 Video (1.0 MB)
1.0 MB

Agbaglah et al. supplementary movie
Experimental movie showing the formation of a rolled up vortex sheet

 Video (789 KB)
789 KB


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