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Acoustic Localization in Weakly Compressible Elastic Media Permeated with Air Bubbles |
| LIANG Bin;ZHU Zhe-Min;CHENG Jian-Chun |
| Laboratory of Modern Acoustics and Institute of Acoustics, Nanjing University, Nanjing 210093 |
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| Cite this article: |
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LIANG Bin, ZHU Zhe-Min, CHENG Jian-Chun 2006 Chin. Phys. Lett. 23 871-874 |
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Abstract The propagation of longitudinal acoustic waves in weakly compressible elastic media permeated with air bubbles is investigated on the basis of the radial pulsation equation of a single bubble. The multiple scattering of waves in such media is rigorously described by using a self-consistent approach. Theoretical results show that there exists strong acoustic localization in a range of frequency slightly above the bubble resonance frequency, even for a very small volume fraction of bubbles. Further study reveals that the localization is in fact attributed to collection behaviour of bubbles, allowing for an efficient cancellation of propagating waves. This is essentially consistent with the known conclusions recently drawn for bubbly liquid by Kou et al. [2003 Appl. Phys. Lett. 83 4247]
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| Keywords:
43.20.+g
02.60.-x
45.05.+x
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Published: 01 April 2006
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| PACS: |
43.20.+g
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(General linear acoustics)
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02.60.-x
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(Numerical approximation and analysis)
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45.05.+x
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(General theory of classical mechanics of discrete systems)
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