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Non-Spherical Collapse of an Air Bubble Subjected to a Lithotripter Pulse

[+] Author Affiliations
Eric Johnsen, Tim Colonius

California Institute of Technology, Pasadena, CA

Wayne Kreider, Michael R. Bailey

University of Washington, Seattle, WA

Paper No. IMECE2007-43156, pp. 285-294; 10 pages
doi:10.1115/IMECE2007-43156
From:
  • ASME 2007 International Mechanical Engineering Congress and Exposition
  • Volume 2: Biomedical and Biotechnology Engineering
  • Seattle, Washington, USA, November 11–15, 2007
  • Conference Sponsors: ASME
  • ISBN: 0-7918-4296-7 | eISBN: 0-7918-3812-9
  • Copyright © 2007 by ASME

abstract

In order to better understand the contribution of bubble collapse to stone comminution in shockwave lithotripsy, the shock-induced and Rayleigh collapse of a spherical air bubble is investigated using numerical simulations, and the free-field collapse of a cavitation bubble is studied experimentally. In shock-induced collapse near a wall, it is found that the presence of the bubble greatly amplifies the pressure recorded at the stone surface; the functional dependence of the wall pressure on the initial standoff distance and the amplitude are presented. In Rayleigh collapse near a solid surface, the proximity of the wall retards the flow and leads to a more prominent jet. Experiments show that re-entrant jets form in the collapse of cavitation bubbles excited by lithotripter shockwaves in a fashion comparable to previous studies of collapse near a solid surface.

Copyright © 2007 by ASME

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