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《Journal of Applied Acoustics》 2019-06
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Numerical investigation on acoustic scattering property and attenuation spectrum of air bubbles with viscosity

DU Na;SU Mingxu;School of Energy and Power Engineering, University of Shanghai for Science and Technology;  
By investigating the scattering model of bubble incorporating the effect of viscosity, the scattering characteristic of a single bubble in water is analyzed numerically. And, the sound attenuation by multiple bubbles is predicted combining the law of Beer-Lambert, which depicts that with the harmonic number increasing, the distribution of scattering intensity stabilizes, and the forward scattering by a single bubble enhances correspondingly. The non-dimensional parameter ka(=0.1) is an important indicator for distinguishing the scattering and absorption, and the latter plays a dominate role in the resonance area. In addition, the attenuation of sound by multiple bubbles in water is consistent with the result of the classical ECAH model when ka is above 0.1, which yields a variation trend proportional to the changes of concentration, and the attenuation spectrum tends to broaden with the increase of shear viscosity at low concentration. The numerical characteristics of acoustic attenuation predicted by this model with particle size, frequency and concentration can provide theoretical basis for the measurement and characterization of particle size and concentration in the two-phase system.
【Fund】: 国家自然科学基金项目(51776129)
【CateGory Index】: O422.5;O359
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