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

Gilou Agbaglah, Marie-Jean Thoraval, Sigurdur T Thoroddsen, Li V. Zhang, Kamel Fezzaa, Robert D. Deegan

Research output: Contribution to journalArticlepeer-review

75 Scopus citations


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. © 2014 Cambridge University Press.
Original languageEnglish (US)
Pages (from-to)764R1-764R12
Number of pages1
JournalJournal of Fluid Mechanics
StatePublished - Jan 2 2015

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The authors thank the James S. McDonnell Foundation for support through a 21st Century Science Initiative in Studying Complex Systems Research Award, S. Weiss and J. Soundar Jerome for valuable discussions, and Claudio Falcon for assistance with the experiments.

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Condensed Matter Physics


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