Aspherical bubble dynamics and oscillation times

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Description

The cavitation bubbles common in laser medicine are rarely perfectly spherical and are often located near tissue boundaries, in vessels, etc., which introduce aspherical dynamics. Here, 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 sightly ... continued below

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[20] p.

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Godwin, R.P.; Chapyak, E.J.; Noack, J. & Vogel, A. March 1, 1999.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 15 times . More information about this report can be viewed below.

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Description

The cavitation bubbles common in laser medicine are rarely perfectly spherical and are often located near tissue boundaries, in vessels, etc., which introduce aspherical dynamics. Here, 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 sightly 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 solid boundaries relative to that of isolated spherical bubbles is also discussed.

Physical Description

[20] p.

Notes

OSTI as DE99002011

Source

  • Photonics West `99: international symposium on biomedical optics (BIOS`99), San Jose, CA (United States), 23-29 Jan 1999

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  • Other: DE99002011
  • Report No.: LA-UR--99-268
  • Report No.: CONF-990110--
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/350971 | External Link
  • Office of Scientific & Technical Information Report Number: 350971
  • Archival Resource Key: ark:/67531/metadc678590

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  • March 1, 1999

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 29, 2016, 1:12 p.m.

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Godwin, R.P.; Chapyak, E.J.; Noack, J. & Vogel, A. Aspherical bubble dynamics and oscillation times, report, March 1, 1999; New Mexico. (digital.library.unt.edu/ark:/67531/metadc678590/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.