Results 251 to 260 of about 7,237 (288)

Shock Wave Interaction with Single Bubbles and Bubble Clouds

2013
Research on the interaction of shock waves with bubbles is highlighted by describing historic studies and recent experiments. We distinguish between the interaction of stable gas bubbles and cavitation bubbles. Gas bubbles and stabilized liquid menisci demonstrate a rapid jetting mechanism if exposed to shock waves. Cavitation bubbles can by themselves
Claus-Dieter Ohl, Siew-Wan Ohl
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Critical angle refractometry and sizing of bubble clouds

Optics Letters, 2007
The principle of the critical angle refractometry and sizing technique is extended to characterize the size distribution and the mean refractive index of clouds of bubbles. For a log-normal bubble-size distribution, simulations show that the mean size, the relative width of the size distribution, and the mean refractive index of the bubbles have a ...
Fabrice, Onofri, Mariusz, Krysiek, Janusz, Mroczka   +2 more
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Hydroacoustical interaction of bubble clouds

The Journal of the Acoustical Society of America, 2002
Acoustically driven cavitation bubble fields consist of typically 104 micron-sized bubbles. Due to their nonlinear hydroacoustical interaction, these extended multiscale systems exhibit the phenomenon of spatiotemporal structure formation. Apart from its significance for the theory of self-organization, it plays a major role in design and control of ...
Stefan Luther, Detlef Lohse
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Nucleating bubble clouds with a pair of laser-induced shocks and bubbles

Journal of Fluid Mechanics, 2013
AbstractLaser-induced optical breakdown at two spatial locations in ultrapure water saturated with ambient gas is used to nucleate microscopic bubble clouds with lifetimes of tens of nanoseconds. The liquid is ruptured via the interaction of a pair of laser-induced shocks and bubbles.
Quinto-Su, Pedro A., Ando, Keita
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The dynamics of periodically driven bubble clouds

The Physics of Fluids, 1988
An averaged two-fluid model is used to study the motion of a cloud of bubbles. The linearized equations of motion are shown to be a wave equation with both dissipation and dispersion. The fully nonlinear equations are also examined and it is demonstrated that the cutoff frequency of the cloud is equal to the natural frequency of a single bubble.
P. Smereka, S. Banerjee
openaire   +1 more source

Statistical description of a cloud of compressible bubbles

Continuum Mechanics and Thermodynamics, 2007
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Chikhi, Nourdine, Gavrilyuk, Sergey L.
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Laboratory experiments on bubble-cloud oscillations.

The Journal of the Acoustical Society of America, 1992
A variety of experiments that have been undertaken to investigate the acoustic characteristics of bubble clouds will be described. These experiments have involved both passive acoustic emission, in which the radiated noise is measured from a bubble cloud that is being produced, and active acoustic scattering, in which sound waves are scattered from a ...
Lawrence A. Crum, Michael Nicholas, Ali Kolaini, Ronald A. Roy   +3 more
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Backscattering of underwater noise by bubble clouds

The Journal of the Acoustical Society of America, 1993
This paper is a continuation of an earlier one [Prosperetti et al., J. Acoust. Soc. Am. 93, XXX (1993)] in which the low-frequency backscattering of sound by hemispherical bubble clouds at the ocean’s surface was studied. Here, clouds of various geometrical shapes (spheroids, spherical segments, cones, cylinders, ellipsoids) are considered and results ...
K. Sarkar, A. Prosperetti
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Sound velocity measurements in a bubble cloud.

The Journal of the Acoustical Society of America, 1991
Sound velocity and attenuation measurements have been made in bubble clouds comprised of water and air. It has been known for some time that the sound velocity in a bubbly liquid is less than that of either the gas or liquid phase (e.g., 70 m/s at 2% void fraction for air bubbles in water).
Stanley A. Cheyne, Ronald A. Roy
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Acoustical emissions from bubble clouds

Ultrasonics, 1994
Abstract Bubble clouds are believed to be responsible for producing acoustical frequencies much lower than the resonant frequencies of the inherent bubbles. Earlier models for determining the resonant frequencies of a cloud were based on a uniform void fraction throughout the cloud.
D.P. Koller, P.M. Shankar
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