Dynamics of air bubbles entrapped by capillary waves
作者:
Hasan N. Oguz,
Michael S. Longuet‐Higgins,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1991)
卷期:
Volume 89,
issue 4B
页码: 2014-2015
ISSN:0001-4966
年代: 1991
DOI:10.1121/1.2029904
出版商: Acoustical Society of America
数据来源: AIP
摘要:
It is well known that entrapment of air bubbles near the sea surface contributes substantially to the underwater noise levels. The collapse of air pockets created by steep capillary waves is a possible mechanism of bubble formation. A boundary integral formulation is employed to simulate the bubble behavior after detachment from these air pockets. The initial profile of the trapped bubble, approximated from the form of the capillary waves, suggests a high elongated bubble relatively far from the sea surface. A sequence of initial bubble shapes is generated from successively closer approximations to the bubble shape. Depending on the initial curvature of the detachment point the bubble may break up into two or oscillate as a single bubble in a rather violent manner. Volume oscillations that are responsible for the radiation of sound are found to be affected by the shape oscillations. It is found that a traveling capillary wave on the bubble surface can cause a pressure pulse upon reaching the axis. As a result, the pressure signal may deviate substantially from the simple damped sinusoid of a spherical bubble. [Work supported by ONR.]
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