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Proceedings Paper

Aspherical bubble dynamics and oscillation times
Author(s): Robert P. Godwin; Edward J. Chapyak; Joachim Noack; Alfred Vogel
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Paper Abstract

Novel features of aspherical bubble dynamics are explored. Time-resolved experimental photographs and simulations of large aspect ratio (length:diameter approximately 20) cylindrical bubble dynamics are presented. The experiments and calculations exhibit similar dynamics. A small high-pressure cylindrical bubble initially expands radially with hardly any axial motion. Then, after reaching its maximum volume, a cylindrical bubble collapses along its long axis with relatively little radial motion. The growth-collapse period of these very aspherical bubbles differs only slightly from twice the Rayleigh collapse time for a spherical bubble with an equivalent maximum volume. This fact justifies using the temporal interval between the acoustic signals emitted upon bubble creation and collapse to estimate the maximum bubble volume. As a result, hydrophone measurements can provide an estimate of the bubble energy even for aspherical bubbles. The prolongation of the oscillation period of bubbles near solids boundaries relative to that of isolated spherical bubbles is also discussed.

Paper Details

Date Published: 14 June 1999
PDF: 12 pages
Proc. SPIE 3601, Laser-Tissue Interaction X: Photochemical, Photothermal, and Photomechanical, (14 June 1999); doi: 10.1117/12.350042
Show Author Affiliations
Robert P. Godwin, Los Alamos National Lab. (United States)
Edward J. Chapyak, Los Alamos National Lab. (United States)
Joachim Noack, Medizinisches Laserzentrum Luebeck GmbH (Germany)
Alfred Vogel, Medizinisches Laserzentrum Luebeck GmbH (Germany)


Published in SPIE Proceedings Vol. 3601:
Laser-Tissue Interaction X: Photochemical, Photothermal, and Photomechanical
Steven L. Jacques; David H. Sliney; Gerhard J. Mueller; Gerhard J. Mueller; Andre Roggan; Andre Roggan; David H. Sliney, Editor(s)

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