Excitation of Oscillations in the Shape of Pulsating Gas Bubbles; Experimental Work
Excitation of Oscillations in the Shape of Pulsating Gas Bubbles; Experimental Work
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DOI：
10.1121/1.1930088
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发表时间：
1958-07
影响因子：
2.4
通讯作者：
M. Strasberg;T. Benjamin
中科院分区：
文献类型：
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作者：
M. Strasberg;T. Benjamin
当液体中的气泡对声音作出反应时，气泡表面可以被激发成振荡的偏离球形。过去人们认为，只有当气泡表面的声压发生变化时，这些形状的振荡才会发生。现在已经观察到，即使声压均匀，只要其振幅超过临界值，也会激发刮刀振荡。当响应于声音的周期性径向脉动时，激励与球面的固有不稳定性有关。对于被困在一个充满水的球体中心以径向对称模式以25kc /秒的速度进行声学共振的单个气泡，测量了导致这种不稳定性的临界声压。当气泡半径从2 × 10−3 cm增加到7 × 10−3 cm时，测量到的引起不稳定的临界峰值声压从0.6大气压降低到0.17大气压。
When a gas bubble in a liquid responds to sound, the bubble surface can be excited into oscillatory departures from spherical shape. In the past it has been assumed that these shape oscillations occur only when the sound pressure varies over the surface of the bubble. It has now been observed that shave oscillations are excited even when the sound pressure is uniform, provided its amplitude exceeds a critical value. The excitation is associated with the inherent instability of a spherical surface when undergoing periodic radial pulsations in response to the sound. The critical sound pressure causing this instability has been measured for individual air bubbles trapped at the center of a water‐filled sphere resonating acoustically in a radially‐symmetric mode at 25 kc/sec. As the bubble radius increases from 2 to 7 × 10−3 cm, the measured critical peak sound pressure causing instability decreases from about 0.6 to 0.17 atmos.