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Cavitation bubble dynamics inside liquid drops in microgravity.

D Obreschkow1, P Kobel, N Dorsaz

  • 1Laboratoire des Machines Hydrauliques, EPFL, 1007 Lausanne, Switzerland.

Physical Review Letters
|October 10, 2006
PubMed
Summary
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Microgravity cavitation bubble collapse in water drops creates unique liquid jets and secondary cavitation. Bubble lifetimes are shorter in drops than in larger volumes, aligning with new Rayleigh-Plesset equation corrections.

Area of Science:

  • Fluid dynamics
  • Microgravity science
  • Acoustics

Background:

  • Cavitation bubbles are fundamental phenomena in fluid dynamics.
  • Understanding bubble dynamics in confined volumes is crucial for various applications.
  • Microgravity offers a unique environment to study isolated bubble behavior.

Purpose of the Study:

  • To investigate the behavior of spark-generated cavitation bubbles within water drops in a microgravity environment.
  • To observe and analyze unique phenomena arising from bubble collapse in a spherical, isolated liquid volume.
  • To validate and refine theoretical models for bubble dynamics.

Main Methods:

  • Utilizing high-speed visualization techniques to capture bubble dynamics.
  • Generating cavitation bubbles using a spark discharge within water drops.

Related Experiment Videos

  • Conducting experiments in a microgravity environment.

    • Main Results:

    • Observed toroidally collapsing bubbles generating two distinct liquid jets, with one exhibiting significant broadening.
    • Documented strong secondary cavitation induced by shock waves due to confinement within the drop.
    • Measured shorter bubble lifetimes in drops compared to extended liquid volumes.
    • Derived corrective terms for the Rayleigh-Plesset equation that accurately predict observed lifetimes.

    Conclusions:

    • The spherical geometry of water drops significantly alters cavitation bubble collapse dynamics.
    • Secondary cavitation and broadened splash jets are unique phenomena in confined microgravity environments.
    • The derived corrections improve the accuracy of the Rayleigh-Plesset equation for bubble lifetimes in isolated volumes.