Robert Mettin: abstract ISNA16_1

A three-dimensional view on bubbles

W. Lauterborn, R. Mettin, D. Krefting, J. Appel, T. Kurz, D. Voit, and C. Bohl

Drittes Physikalisches Institut, Universität Göttingen,
Bürgerstraße 42-44, D-37073 Göttingen, Germany


Abstract

Acoustic cavitation bubbles in ultrasonic standing wave fields tend to organize themselves in dynamic structures resembling dendritic filaments. They follow nonlinear acoustic forces induced by the acoustic field and by the interaction between the oscillating bubbles (the Bjerknes forces). To gain information about the motion of bubbles in an acoustically cavitating liquid two new methods have been developed: holographic particle image velocimetry (HPIV) and a stereoscopic high-speed cinematographic arrangement with two synchronized CCD-cameras for all-digital three-dimensional particle tracking velocimetry (3D-PTV). In 3D-PTV the maximum framing rate is 2250 frames per second, and the maximum pbservation time is 7.28 seconds at this speed. Via digital picture processing from the two picture streams the three-dimensional position of the bubbles can be determined, and by particle tracking from frame to frame their motion giving the complete spatial dynamics of bubble clouds. Examples of bubble tracks in cavitation bubble fields at sound field frequencies around 20 kHz and of velocity distributions are given.


in: O.V. Rudenko and O.A. Sapozhnikov (eds.),
Nonlinear Acoustics at the Beginning of the 21st Century,
(Proceedings of the 16th International Symposium on Nonlinear Acoustics ISNA-16),
Faculty of Physics, MSU, Moscow, 2002, vol. 2, pp. 971-978.


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