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Nucleation threshold and deactivation mechanisms of nanoscopic cavitation nuclei

Phys. Fluids 21, 102003 (2009); doi:10.1063/1.3249602

Published 19 October 2009

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Bram M. Borkent, Stephan Gekle, Andrea Prosperetti, and Detlef Lohse
Physics of Fluids, Faculty of Science and Technology and J.M. Burgers Centre for Fluid Dynamics, Impact Institute and MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
The acoustic nucleation threshold for bubbles trapped in cavities has theoretically been predicted within the crevice theory by Atchley and Prosperetti [“The crevice model of bubble nucleation,” J. Acoust. Soc. Am. 86, 1065 (1989)]. Here, we determine this threshold experimentally, by applying a single pressure pulse to bubbles trapped in cylindrical nanoscopic pits (“artificial crevices”) with radii down to 50 nm. By decreasing the minimum pressure stepwise, we observe the threshold for which the bubbles start to nucleate. The experimental results are quantitatively in good agreement with the theoretical predictions of Atchley and Prosperetti. In addition, we provide the mechanism which explains the deactivation of cavitation nuclei: gas diffusion together with an aspherical bubble collapse. Finally, we present superhydrophobic nuclei which cannot be deactivated, unless with a high-speed liquid jet directed into the pit. ©2009 American Institute of Physics
History: Received 26 May 2009; accepted 11 September 2009; published 19 October 2009
Permalink: http://link.aip.org/link/?PHFLE6/21/102003/1
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1070-6631 (print)   1089-7666 (online)
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