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Related Experiment Videos

Viscosity destabilizes sonoluminescing bubbles.

Ruediger Toegel1, Stefan Luther, Detlef Lohse

  • 1Faculty of Science & Technology, University of Twente, Post Office Box 217, 7500 AE Enschede, The Netherlands.

Physical Review Letters
|April 12, 2006
PubMed
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In single-bubble sonoluminescence (SBSL), higher liquid viscosity unexpectedly destabilizes microbubble trapping. Researchers identified a history force causing this parametric instability, explaining the observed quasiperiodic bubble motion.

Area of Science:

  • Acoustics
  • Fluid Dynamics
  • Physical Chemistry

Background:

  • Single-bubble sonoluminescence (SBSL) typically involves trapping microbubbles in standing sound waves within low-viscosity liquids like water.
  • Higher liquid viscosity is generally expected to stabilize bubble dynamics.

Purpose of the Study:

  • To investigate the phenomenon of
  • moving-SBSL
  • ,
  • , where microbubbles are not stably trapped in highly viscous liquids.
  • To identify the underlying physical mechanism responsible for the observed instability in viscous media.

Main Methods:

  • Theoretical analysis identifying the history force (a time-nonlocal force) as a key factor.
  • Parametric instability analysis to explain the destabilization.

Related Experiment Videos

  • Development of a force balance model to quantitatively describe bubble trajectories.

    • Main Results:

    • The history force is identified as the origin of destabilization in highly viscous liquids.
    • The observed instability in "moving-SBSL" is shown to be parametric.
    • A force balance model accurately predicts the quasiperiodic bubble trajectories in viscous media.

    Conclusions:

    • The peculiar "moving-SBSL" state arises from a history force leading to parametric instability.
    • Viscosity, contrary to intuition, can destabilize microbubble trapping in SBSL.
    • The developed force balance model provides a quantitative explanation for the observed phenomena.