An investigation of the collective oscillations of a bubble cloud
An investigation of the collective oscillations of a bubble cloud
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DOI：
10.1121/1.1894629
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发表时间：
1991-02
影响因子：
2.4
通讯作者：
S. Yoon;L. Crum;A. Prosperetti;N. Q. Lu
中科院分区：
文献类型：
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作者：
S. Yoon;L. Crum;A. Prosperetti;N. Q. Lu
众所周知，频率范围从几百赫兹到几十千赫的海洋环境噪声水平与风速密切相关。一种物理机制可以解释这种声音的产生，那就是破碎的波浪产生的气泡云。本文报道了一个简单的实验室研究，研究了一列气泡产生的声音。从该柱的各种特性的测量中，获得了柱内的气泡以集体振荡模式振动的良好证据。基于集体振荡的假设，该柱的预测振动频率的分析计算以及该频率对气泡数量和柱几何形状等参数的依赖性与测量值密切一致。这些结果表明，由破碎波产生的气泡羽流可以是相对低频（< 1 kHz）的环境噪声的强源。
It is well known that ocean ambient noise levels in the frequency range from a few hundred hertz to several tens of kilohertz are well correlated with wind speed. A physical mechanism that could account for some of this sound generation is the production of bubble clouds by breaking waves. A simple laboratory study of the sound generated by a column of bubbles is reported here. From measurements of the various characteristics of this column, good evidence is obtained that the bubbles within the column are vibrating in a collective mode of oscillation. Based upon an assumption of collective oscillations, analytical calculations of the predicted frequency of vibration of this column as well as the dependence of this frequency on such parameters as bubble population and column geometry agree closely with the measured values. These results give evidence that the bubble plumes generated by breaking waves can be a strong source of relatively low frequency (< 1 kHz) ambient noise.