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Related Experiment Videos

Macroscopic ESWL-induced cavitation: in vitro studies

G Pittomvils1, J P Lafaut, H Vandeursen

  • 1Catholic University Leuven, Department of Didactical Physics, Belgium.

Ultrasound in Medicine & Biology
|January 1, 1995
PubMed
Summary

Rarefaction shock waves cause liquid failure, forming bubbles that collapse and generate detectable shock waves. This study visualizes bubble dynamics and shock wave generation using laser diffraction and high-speed imaging.

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Area of Science:

  • Acoustic cavitation
  • Shock wave physics
  • Fluid dynamics

Background:

  • Extracorporeal shock wave lithotripsy (ESWL) generates shock waves that can induce cavitation.
  • Cavitation bubble collapse is a complex phenomenon producing secondary shock waves.
  • Understanding bubble dynamics is crucial for applications involving shock wave-fluid interactions.

Purpose of the Study:

  • To investigate the formation and collapse of cavitation bubbles induced by ESWL-generated shock waves.
  • To characterize the shock wave emitted during bubble implosion.
  • To visualize and quantify cavitation bubble dynamics in filtered water.

Main Methods:

  • Generation of shock waves using a simulated ESWL setup.
  • High-speed imaging with a stroboscope (10 µs exposure) to capture bubble evolution.

Related Experiment Videos

  • Laser diffraction (He-Ne laser) to detect the shock wave from bubble collapse.

    • Main Results:

    • Macroscopic cavitation bubbles were observed in the wake of reflected shock waves.
    • Bubble implosion generated a distinct shock wave, confirming bubble existence and lifetime.
    • The radius of the cavitation bubble showed time-dependent growth, consistent with theoretical predictions.

    Conclusions:

    • ESWL-induced rarefaction shock waves lead to liquid failure and cavitation bubble formation.
    • Cavity implosion is a source of secondary shock waves, detectable via laser diffraction.
    • The study provides visual and physical evidence of cavitation bubble dynamics under shock wave influence.