Abstract Based on the modification of the radial pulsation equation of an individual bubble, an effective medium method (EMM) is presented for studying propagation of linear and nonlinear longitudinal acoustic waves in viscoelastic medium permeated with air bubbles. A classical theory developed previously by Gaunaurd (Gaunaurd GC and überall H, J. Acoust. Soc. Am., 1978; 63: 1699--1711) is employed to verify the EMM under linear approximation by comparing the dynamic (i.e. frequency-dependent) effective parameters, and an excellent agreement is obtained. The propagation of longitudinal waves is hereby studied in detail. The results illustrate that the nonlinear pulsation of bubbles serves as the source of second harmonic wave and the sound energy has the tendency to be transferred to second harmonic wave. Therefore the sound attenuation and acoustic nonlinearity of the viscoelastic matrix are remarkably enhanced due to the system's resonance induced by the existence of bubbles.
Received: 29 August 2005
Revised: 23 September 2005
Accepted manuscript online:
PACS:
43.25.Ed
(Effect of nonlinearity on velocity and attenuation)
(Acoustics of sediments; ice covers, viscoelastic media; seismic underwater acoustics)
Fund: Project supported by the Excellent Youth Science Foundation of China (Grant No 10125417) and the State Key Development Program of Basic Research (Grant No 51315).
Cite this article:
Liang Bin (梁彬), Zhu Zhe-Min (朱哲民), Cheng Jian-Chun (程建春) Propagation of acoustic wave in viscoelastic medium permeated with air bubbles 2006 Chinese Physics 15 412
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