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 by time-resolved photography and numerical simulations. The growth-collapse period of cylindrical bubbles of large aspect ratio (length:diameter {approximately}20) 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 ... continued below

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4 p.

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

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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 by time-resolved photography and numerical simulations. The growth-collapse period of cylindrical bubbles of large aspect ratio (length:diameter {approximately}20) 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 size and energy even for aspherical bubbles. The change of the oscillation period of bubbles near solid walls and elastic (tissue-like) boundaries relative to that of isolated spherical bubbles is also investigated.

Physical Description

4 p.

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OSTI as DE99002739

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  • New concepts in therapeutic laser applications session of CLEO/Europe, Munich (Germany), 13-17 Jun 1999

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  • Other: DE99002739
  • Report No.: LA-UR--99-697
  • Report No.: CONF-990611--
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/350954 | External Link
  • Office of Scientific & Technical Information Report Number: 350954
  • Archival Resource Key: ark:/67531/metadc683792

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • June 1, 1999

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Feb. 29, 2016, 1:12 p.m.

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Vogel, A.; Noack, J.; Chapyak, E.J. & Godwin, R.P. Aspherical bubble dynamics and oscillation times, report, June 1, 1999; New Mexico. (digital.library.unt.edu/ark:/67531/metadc683792/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.