Bubble production by air filament and cavity breakup in plunging breaking wave crests

Qiang Gao, Grant B. Deane, Lian Shen

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Air filaments and cavities in plunging breaking waves, generically cylinders, produce bubbles through an interface instability. The effects of gravity, surface tension and surface curvature on cylinder breakup are explored. A generalized dispersion relation is obtained that spans the Rayleigh-Taylor and Plateau-Rayleigh instabilities as cylinder radius varies. The analysis provides insight into the role of surface tension in the formation of bubbles from filaments and cavities. Small filaments break up into bubbles through a Plateau-Rayleigh instability driven through the action of surface tension. Large air cavities produce bubbles through a Rayleigh-Taylor instability driven by gravity and moderated by surface tension, which has a stabilizing effect. Surface tension, interface curvature and gravity are all important for cases between these two extremes. Predicted unstable mode wavenumber and bubble size show good agreement with direct numerical simulations of plunging breaking waves and air cylinders.

Original languageEnglish (US)
Article number2021890
JournalJournal of Fluid Mechanics
Volume929
DOIs
StatePublished - Dec 25 2021

Bibliographical note

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Keywords

  • bubble dynamics
  • wave breaking

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