Results 241 to 250 of about 7,237 (288)
Behaviors of the bubble, cloud, and emulsion phases in a fluidized bed
AIChE Journal, 2007 AbstractAn intrusive bioptical probe provides radial profiles of the PDF (probability density function) of the bubble, the cloud, and the emulsion phases behaviors in a fluidized bed of Geldart‐A particles. The fluidizing velocity ranges between 0.20 and 0.80 m/s. The bed porosity, the overall averaged bubble chords and velocities are well‐predicted by
Andreux, Régis, Chaouki, Jamal
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Collective oscillations in bubble clouds [PDF]
Journal of Fluid Mechanics, 2011 In this paper the collective oscillations of a bubble cloud in an acoustic field are theoretically analysed with concepts and techniques of condensed matter physics. More specifically, we will calculate the eigenmodes and their excitabilities, eigenfrequencies, densities of states, responses, absorption and participation ratios to better understand the
Zeravicic, Zorana +2 more
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Proceedings of the 13th International Conference on Advances in Computer Entertainment Technology, 2016
We introduce Bubble Cloud ---a technology that uses a bubble cluster for displaying images onto a screen. Bubble Cloud projects images onto bubbles without confining a fog and can float in the air by changing an operating condition of the bubble cluster such as altering the size of the bubble. Moreover, the user can modify the display because its shape
Yuki Kubo +4 more
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We introduce Bubble Cloud ---a technology that uses a bubble cluster for displaying images onto a screen. Bubble Cloud projects images onto bubbles without confining a fog and can float in the air by changing an operating condition of the bubble cluster such as altering the size of the bubble. Moreover, the user can modify the display because its shape
Yuki Kubo +4 more
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Bubble and bubble cloud excitation
The Journal of the Acoustical Society of America, 2003Bubbles, spray, splash, and clouds are formed by breaking waves and have been shown to be responsible for the production of sound. In the low-frequency-region, i.e., 20–500 Hz, the oscillation of the cloud as a whole is thought to be responsible for the radiation of sound.
Harish Gopolan +2 more
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Simultaneous Observation of Bubble Clouds and Microhollows Produced by Bubble Cloud Cavitation
Japanese Journal of Applied Physics, 2013Sonoporation, which forms small pores through the cell membrane, is a useful method in ultrasonic-wave-mediated drug delivery systems. However, if microbubbles aggregate by acoustic radiation force and form bubble clouds, the mechanism of sonoporation becomes complicated.
Yoshiki Yamakoshi +4 more
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Bubble-bubble interaction in disperse bubble clouds
The Journal of the Acoustical Society of America, 2008Disperse bubble fields driven by pressure waves feature effects of time delays associated with the finite speed of travel of the driving acoustic wave, and the finite travel time of pressure waves between bubbles. The relative spatial arrangement of bubble nuclei in a disperse field, and the direction of the incoming pressure wave, both influence the ...
Andrew J. Szeri +3 more
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Acoustics, 2019 We studied the effects of a small bubble cloud located at the pre-focal area of a high-intensity focused ultrasound field. Our objective is to show that bubbles can modify the bioeffects of an ultrasound treatment in muscle tissue.
Hynynen Kullervo +2 more
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Bubble and bubble cloud dynamics
AIP Conference Proceedings, 2000Cavitation bubbles are formed from small air bubbles, so-called nuclei, with the surrounding pressure reduction caused by the flow, and then, the bubbles shrink and collapse with the surrounding pressure rise. Such volumetric changes of bubbles are calculated in detail and it is found that they are significantly influenced by the internal phenomena ...
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Acoustics and hydrodynamics of bubble clouds
The Journal of the Acoustical Society of America, 1990In the last few years, it has been realized that the near-surface clouds of bubbles produced by breaking waves may play an important role in the generation of oceanic ambient noise. In addition, the clouds are potentially very strong scatterers of sound and may therefore be responsible for the anomalous backscattering data reported by several ...
H. N. Oḡuz, A. Prosperetti
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Scattering of sound by bubble clouds
The Journal of the Acoustical Society of America, 1991Experimental results are shown for the scattering of ultrasonic pulses by a small volume of air bubbles in water. Two different types of bubblemakers are used to generate the bubble clouds. The first one uses an array of short wires spaced uniformly over a horizontal square area.
Karin M. Hogan +2 more
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