The water entry of multi-droplet streams and jets

Nathan B. Speirs, Zhao Pan, Jesse Belden, Tadd T. Truscott

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Water entry has been studied for over a century, but few studies have focused on multiple droplets impacting on a liquid bath sequentially. We connect multi-droplet streams, jets and solid objects with physical-based scaling arguments that emphasize the intrinsically similar cavities. In particular, the cavities created by the initial impact of both droplet streams and jets on an initially quiescent liquid pool exhibit the same types of cavity seal as hydrophobic spheres at low Bond number, some of which were previously unseen for jets and droplet streams. Low-frequency droplet streams exhibit an additional three new cavity seal types unseen for jets or solid spheres that can be predicted with a new non-dimensional frequency. The cavity depth and cavity velocity for both droplet and jet impact are rationalized by an energy scaling analysis and the Bernoulli equation.
Original languageEnglish (US)
Pages (from-to)1084-1111
Number of pages28
JournalJournal of Fluid Mechanics
Volume844
DOIs
StatePublished - Jun 10 2018
Externally publishedYes

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Condensed Matter Physics

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