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Long-lasting stable cavitation.

Jean-Louis Mestas1, Peter Lenz, Dominique Cathignol

  • 1Institut National de la Santé et de la Recherche Médicale, Unité 556, 151 cours Albert Thomas, 69424 Lyon Cedex 03, France. mestas@lyon.inserm.fr

The Journal of the Acoustical Society of America
|March 27, 2003
PubMed
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Stable cavitation, a phenomenon involving ultrasonic waves and abrasive targets, was sustained for five hours. Researchers observed unique "latent" cavitation bubbles persisting without excitation.

Area of Science:

  • Acoustics and Materials Science
  • Investigates the interplay between acoustic cavitation and material surfaces.

Background:

  • Stable cavitation is crucial for various applications, but its sustained generation and control remain challenging.
  • Understanding cavitation dynamics on specific material surfaces is key to optimizing ultrasonic processes.

Purpose of the Study:

  • To investigate the conditions for producing and maintaining stable cavitation on an abrasive foil.
  • To characterize the acoustic emissions and bubble behavior during stable cavitation.

Main Methods:

  • Insonification of a 15-micrometer abrasive foil using a 473 kHz focused ultrasonic beam.
  • Controlled pressure reduction from 2 MPa to 100 kPa to induce and stabilize cavitation.
  • Monitoring acoustic emissions, particularly half-order subharmonics, and bubble persistence.

Related Experiment Videos

Main Results:

  • Stable cavitation was successfully produced and maintained on the abrasive foil for up to five hours under optimized conditions.
  • A strong emission of half-order subharmonics was observed, characteristic of stable cavitation.
  • Evidence of "latent" cavitation bubbles persisting for minutes without excitation was found.

Conclusions:

  • Stable cavitation can be sustained for extended periods on specialized abrasive surfaces by carefully controlling acoustic parameters.
  • The observed subharmonic emissions and latent bubbles provide insights into the complex dynamics of stable cavitation.
  • This study offers a foundation for developing controlled and stable cavitation applications.