自然科学版
陕西师范大学学报(自然科学版)
声空化理论及应用专题
单气泡和多气泡的声空化效应研究进展
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安宇*,袁月,苗博雅
(清华大学 物理系,北京 100084)
安宇,男,教授,博士生导师,研究方向为声空化。 E-mail:anyuw@mail.tsinghua.edu.cn
摘要:
分别从单气泡和多气泡两个方面对声空化效应的研究进展进行综述。在单气泡方面,明确了单气泡声致发光的机理实际是高温高压气体发光。但如果按已有理论计算,气泡内气体的电离度不足以达到实验观察到的发光强度,计算与实验定量差距比较大,电离过程还有待进一步研究。在多气泡方面,介绍了多气泡空化现象研究进展,特别是给出了气泡排成线和气泡群形成小的球形团状结构时计算气泡间相互作用的简化公式,并给出利用平均场理论计算声空化声场的方法。最后分析最近在声空化云中观察到的声频谱禁带现象,利用声空化平均场理论计算可以再现这种效应,并利用线性分析方法揭示此现象出现的原因。
关键词:
声致发光;声空化;声禁带
收稿日期:
2019-12-02
中图分类号:
O426.2
文献标识码:
A
文章编号:
1672-4291(2020)03-0074-09
基金项目:
国家自然科学基金 (11334005)
Doi:
The progress of acoustic cavitation of single bubble and multipe bubbles
AN Yu*, YUAN Yue, MIAO Boya
(Department of Physics, Tsinghua University, Beijing 100084, China)
Abstract:
The present work reviews the progress of single bubble and multipe bubbles acoustic cavitation.The mechanism of sonoluminescence is actually the high temperature and high pressure gas light. However, if calculated according to the present theory, the ionization degree of the gas inside the bubble is not enough to achieve the luminous intensity observed in the experiment, and there is a large difference between the calculated value and the experimental observation, and the ionization process needs further study. Secondly, the research progress of cavitation phenomenon with multiple bubbles is introduced, especially gives the simplified formula for calculating the interaction between bubbles when bubbles line up and bubbles group form small spherical structure, and introduces the method for calculating the acoustic field of acoustic cavitation by using the average field theory. In the end, the phenomenon of band gap in the acoustic spectrum in the acoustic cavitation cloud is introduced. This effect can be reproduced by using the theoretical calculation of the average field of acoustic cavitation, and the reason of this phenomenon can be revealed by using the linear analysis method.
KeyWords:
sonoluminescence; acoustic cavitation; acoustic forbidden band