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Collapse dynamics of smectic-A bubbles.

F Caillier1, P Oswald

  • 1Laboratoire de Physique de l'Ecole Normale Supérieure de Lyon, 46 Allée d'Italie, 69364, Lyon Cedex 07, France. francois.caillier@ens-lyon.fr

The European Physical Journal. E, Soft Matter
|June 23, 2006
PubMed
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Smectic-A bubble collapse occurs in two distinct stages: rapid meniscus destabilization and slower bubble deflation. This study characterizes the shear-thinning behavior of smectic phases during bubble collapse.

Area of Science:

  • Materials Science
  • Fluid Dynamics
  • Soft Matter Physics

Background:

  • Smectic-A phases exhibit complex fluid behaviors.
  • Understanding bubble dynamics is crucial for various applications.
  • Previous studies have not fully detailed the multi-step collapse of smectic-A bubbles.

Purpose of the Study:

  • To experimentally and theoretically analyze the collapse dynamics of smectic-A bubbles.
  • To characterize the shear-thinning behavior of smectic phases during bubble collapse.
  • To demonstrate a generic method for studying bubble collapse dynamics.

Main Methods:

  • Bubbles were created from flat films and deflated via capillary tubes of controlled dimensions.
  • Collapse time was varied by adjusting capillary length and diameter.

Related Experiment Videos

  • Laplace pressure and internal bubble pressure were measured simultaneously.

    • Main Results:

    • Bubble collapse proceeds in two distinct phases: rapid meniscus destabilization (seconds) and slower bubble deflation with material exchange.
    • Focal conics form during the initial meniscus destabilization.
    • The shear-thinning behavior of the smectic phase within the meniscus was fully characterized.

    Conclusions:

    • The two-step collapse mechanism provides new insights into smectic-A bubble dynamics.
    • The developed method allows for controlled variation of collapse times.
    • This generic approach is applicable to other bubble systems like soap bubbles, provided inertial effects are negligible.