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Soap films burst like flapping flags.

Henri Lhuissier1, Emmanuel Villermaux

  • 1Aix-Marseille Université, IRPHE, 13384 Marseille Cedex 13, France.

Physical Review Letters
|October 2, 2009
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Summary
This summary is machine-generated.

A punctured soap film bursts, forming ligaments that break into droplets. This occurs due to a flaglike instability between the film and air, causing oscillations and liquid fragmentation.

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Area of Science:

  • Fluid dynamics
  • Surface tension phenomena
  • Instability in thin films

Background:

  • Punctured soap films burst due to surface tension.
  • The rim of the bursting hole develops indentations and ligaments.
  • These ligaments break, forming a mist of droplets.

Purpose of the Study:

  • To investigate the cause of indentations and ligament formation at the rim of a bursting soap film.
  • To explain the transition from a connected film to a spray of droplets.

Main Methods:

  • Original observations of bursting soap films.
  • Analysis of the dynamic instability at the hole rim.

Main Results:

  • Indentations form due to a flaglike instability between the film and the atmosphere.
  • This instability induces out-of-plane oscillatory motion.
  • Liquid ligaments are centrifuged from the film, leading to pinch-off and droplet formation.

Conclusions:

  • The observed spray from bursting soap films results from a flaglike aerodynamic instability.
  • The dynamics of thin liquid films are highly sensitive to their surrounding medium.