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Journal of the Acoustical Society of America / Volume 118 / Issue 6 / NONLINEAR ACOUSTICS [25]

A model for large amplitude oscillations of coated bubbles accounting for buckling and rupture

J. Acoust. Soc. Am. Volume 118, Issue 6, pp. 3499-3505 (2005); (7 pages)

Philippe Marmottant1, Sander van der Meer1, Marcia Emmer1, Michel Versluis1, Nico de Jong2, Sascha Hilgenfeldt1, and Detlef Lohse1

1Department of Science and Technology, University of Twente, P.O. Box 217, 7500AE Enschede, The Netherlands
2Department of Science and Technology, University of Twente, P.O. Box 217, 7500AE Enschede, The Netherlands and Department of Experimental Echocardiography, Thoraxcentre, Erasmus MC, Rotterdam, The Netherlands

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We present a model applicable to ultrasound contrast agent bubbles that takes into account the physical properties of a lipid monolayer coating on a gas microbubble. Three parameters describe the properties of the shell: a buckling radius, the compressibility of the shell, and a break-up shell tension. The model presents an original non-linear behavior at large amplitude oscillations, termed compression-only, induced by the buckling of the lipid monolayer. This prediction is validated by experimental recordings with the high-speed camera Brandaris 128, operated at several millions of frames per second. The effect of aging, or the resultant of repeated acoustic pressure pulses on bubbles, is predicted by the model. It corrects a flaw in the shell elasticity term previously used in the dynamical equation for coated bubbles. The break-up is modeled by a critical shell tension above which gas is directly exposed to water.

© 2005 Acoustical Society of America

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KEYWORDS and PACS

Keywords

bubbles, nonlinear acoustics, cavitation, acoustic pulses, acoustic intensity, elasticity, ultrasonic waves, buckling, fracture, oscillations

PACS

  • 43.25.Yw

    Nonlinear acoustics of bubbly liquids

  • 43.35.Ei

    Acoustic cavitation in liquids

ARTICLE DATA

History
Received 31 Mar 2005
Accepted 13 Sep 2005
Revised 25 Aug 2005
Digital Object Identifier
http://dx.doi.org/10.1121/1.2109427

PUBLICATION DATA

ISSN

0001-4966 (print)  

Publisher

$abstract.society.value is a Member of CrossRef Acoustical Society of America

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