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声波在含气泡软媒质中的局域化

发表时间:2010-08-15  浏览量:1129  下载量:604
全部作者: 梁彬,程建春
作者单位: 南京大学物理学院,近代声学教育部重点实验室
摘 要: 对声波在包含有限数目气泡的弹性软媒质中的传播特性进行理论研究。结合数值方法,表明气泡散射造成的模式转换效应可忽略。运用自洽场方法严格求解该模型中的声传播问题,数值计算结果显示:此类媒质中的声波均可在略高于气泡本振频率的一个频段内发生局域化现象,且不同类型的软媒质中的声局域化性质基本相似。此外,分析了粘滞效应的存在对声局域化特性的影响规律,结果表明:声局域化现象并非由声吸收效应引起,相反其存在会破坏声波的局域化条件。
关 键 词: 声学;声波;气泡;软媒质;局域化
Title: Localization of acoustic waves in a bubbly soft medium
Author: LIANG Bin, CHENG Jianchun
Organization: Key Laboratory of Modern Acoustics, Ministry of Education, Physics School of Nanjing University
Abstract: In this paper, the propagation of longitudinal wave in soft elastic media containing random air bubbles is theoretically studied by using a self�consistent method. By inspecting the scattering cross section of an individual bubble and estimating the mean free paths of the elastic wave propagating in the bubbly weakly compressible media, the mode conversion is numerically proved negligible as the longitudinal wave is scattered by the bubbles. The wave propagation is solved rigorously with the multiple scattering effects incorporated. In a range of frequency slightly above the bubble resonance frequency, the acoustic localization in such a class of media is theoretically identified, and the localization properties of acoustic waves are similar for different kinds of soft media. The influence of the acoustic absorption has also been investigated, and the results show that the acoustic localizations in such media are not due to the absorption effect, and the existence of viscosity will weaken the extents of acoustic localizations.
Key words: acoustics; acoustic waves; bubbles; soft medium; localization
发表期数: 2010年8月第15期
引用格式: 梁彬,程建春. 声波在含气泡软媒质中的局域化[J]. 中国科技论文在线精品论文,2010,3(15):1546-1552.
 
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