在剪切流中破碎的气泡的声激发。
The acoustic excitation of air bubbles fragmenting in sheared flow.
作者信息
Deane Grant B, Stokes M Dale
机构信息
Marine Physical Laboratory, Scripps Institution of Oceanography, UCSD, La Jolla, California 92093-0238, USA.
出版信息
J Acoust Soc Am. 2008 Dec;124(6):3450-63. doi: 10.1121/1.3003076.
An analysis of the acoustic emissions of air bubbles fragmenting in sheared fluid flow is presented. The fragmentation of bubbles into two products only is considered. While the measured pressure amplitude is highly variable, the partition of energy between fragmentation products is highly correlated. The partition of energy between products is, on average, approximately equal irrespective of the relative sizes of the bubble products. This observation suggests that the acoustic excitation mechanism is common to both bubbles immediately prior to fragmentation. A model for the excitation mechanism based on symmetric collapse of the neck of air joining fragmentation products is proposed and found to be sufficient to explain the range of observed bubble pulse amplitudes and the equal partition of energy.
本文对剪切流体流动中气泡破碎时的声发射进行了分析。仅考虑气泡破碎为两种产物的情况。虽然测量到的压力幅度变化很大，但破碎产物之间的能量分配高度相关。无论气泡产物的相对大小如何，产物之间的能量分配平均大致相等。这一观察结果表明，声激发机制在破碎前的两个气泡中是相同的。提出了一种基于连接破碎产物的空气颈部对称坍塌的激发机制模型，发现该模型足以解释观察到的气泡脉冲幅度范围和能量的均等分配。
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