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Phys. Rev. Lett. 101, 234301 (2008) [4 pages]

Molecular Dynamics of Extreme Mass Segregation in a Rapidly Collapsing Bubble

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Alexander Bass1, Steven J. Ruuth2, Carlos Camara1, Barry Merriman3, and Seth Putterman1
1Department of Physics and Astronomy, University of California at Los Angeles, Los Angeles, California 90095, USA
2Department of Mathematics, Simon Fraser University, Burnaby, British Columbia, V5A 1S6, Canada
3Department of Mathematics, University of California at Los Angeles, Los Angeles, California 90095, USA

Received 16 July 2008; published 5 December 2008

A molecular dynamic simulation of a mixture of light and heavy gases in a rapidly imploding sphere exhibits virtually complete segregation. The lighter gas collects at the focus of the sphere and reaches a temperature that is several orders of magnitude higher than when its concentration is 100%. Implosion parameters are chosen via a theoretical fit to an observed sonoluminescing bubble with an extreme expansion ratio (25∶1) of maximum to ambient radii.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.234301
DOI:
10.1103/PhysRevLett.101.234301
PACS:
78.60.Mq, 02.70.Ns