Bubble-bubble interaction: A potential source of cavitation noise
Bubble-bubble interaction: A potential source of cavitation noise
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DOI：
10.1103/physreve.79.016307
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发表时间：
2009-01-01
影响因子：
2.4
通讯作者：
Ida, Masato
中科院分区：
文献类型：
--
作者：
Ida, Masato
研究了压力脉冲作用下微气泡间的相互作用，结果表明微气泡间的相互作用是空化噪声的一个来源。最近的一份报告表明，由虾产生的噪音来自于当虾关闭其笛鲷爪时产生的空化泡的破裂。所记录的声信号包含由正脉冲和负脉冲组成的宽带噪声，但是单个气泡的理论模型不能再现负脉冲。使用非线性多气泡模型，我们在这里已经表明，负脉冲可以通过考虑空化气泡崩溃和破碎后形成的微气泡的相互作用来解释：在微气泡崩溃时产生的正脉冲撞击并冲动地压缩相邻的微气泡，以产生振幅为负的反射脉冲。讨论了噪声产生过程的细节，我们发现，如果反射气泡的内部压力很高，当被正脉冲击中时，不会产生负脉冲。
The interaction between microbubbles through pressure pulses has been studied to show that it can be a source of cavitation noise. A recent report demonstrated that the acoustic noise generated by a shrimp originates from the collapse of a cavitation bubble produced when the shrimp closes its snapper claw. The recorded acoustic signal contains a broadband noise that consists of positive and negative pulses, but a theoretical model for single bubbles fails to reproduce the negative ones. Using a nonlinear multibubble model, we have shown here that the negative pulses can be explained by considering the interaction of microbubbles formed after the cavitation bubble has collapsed and fragmented: Positive pulses produced at the collapse of the microbubbles hit and impulsively compress neighboring microbubbles to generate reflected pulses whose amplitudes are negative. Discussing the details of the noise generation process, we have found that no negative pulses are generated if the internal pressure of the reflecting bubble is very high when hit by a positive pulse.