Results 161 to 170 of about 35,987 (205)

Cavitation dynamics and flow aggressiveness in ultrasonic cavitation erosion

International Journal of Mechanical Sciences, 2021
Abstract The mechanisms of cavitation erosion have been the subject of numerous studies, but the cavitation dynamics and flow aggressiveness thereby produced are less known. We develop a new numerical model to capture the cavity evolution and pressure pulsation, which are related to cavitation erosion.
Jianhua Du, Fengjun Chen
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Ultrasonic transducer with low cavitation

The Journal of the Acoustical Society of America, 2002
An ultrasonic sonar transducer ( 10 ) for facilitating transmission and reception of sonar signals, particularly at high speeds. The sonar transducer includes a transducer element ( 12 ) and a transducer housing ( 14 ). The housing includes a bottom wall ( 34 ) that is continuously curved with no major portion thereof parallel to the bottom face of the
John Whiteside, Craig Mehan
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Ultrasonic cavitation in polymer solutions

British Journal of Applied Physics, 1963
Further calculations are made to support the theory of polymer degradation by ultrasonics proposed by the authors. A correction is made to the radius of the polymer molecule in solution, and a correlation between ultrasonic pressure and polymer molecular size is made. A possible mechanism of degradation by cavitation is suggested.
N H Langton, P Vaughan
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Erosion characteristics in ultrasonic cavitation

Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 2009
Cavitation erosion is accomplished by a magnetostrictive transducer at different experiment input powers using column steel samples. The distribution characteristics of bubbles on the emitting surfaces are observed at different times. The photo records show that ultrasonic bubbles distributed on the emitting surface will converge and form some ...
Luo Jing, Li Jian
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Polymerization resulting from ultrasonic cavitation

Ultrasonics, 1983
Abstract Polymerization due to ultrasonically induced cavitation is reported for a number of compounds: bromobenzene, styrene, isoprene, and methyl methacrylate. The molecular weight of the polymethylmethacrylate produced through ultrasound is considerably lower than that due to normal aging.
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Statistical Approach to Ultrasonic Cavitation

The Journal of the Acoustical Society of America, 1963
Sound cavitation is due to nuclei existing in the liquid. When they are created in water, they live for a long time, and therefore their equilibrium concentration is much larger than the number of nuclei created in the time unit. Experimental investigation allows measurement of the number of nuclei present in water as a function of the sound pressure ...
D. Messinò, D. Sette, F. Wanderlingh
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Ultrasonically induced cavitation in mammals

The Journal of the Acoustical Society of America, 1986
The role of cavitation in the production of biological effects in mammals is reviewed with emphasis on recent studies in the mouse neonate. The levels for hind limb paralysis from 1 MHz, continuous wave unfocused ultrasound in the neonatal mouse, within 24 h of birth, have been investigated at 1 and 16 bars ambient pressure and temperature between 10 ...
Leon A. Frizzell, Chong S. Lee
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Ultrasonic Cavitation Thresholds in Water

The Journal of the Acoustical Society of America, 1954
The temperature dependence of the minimum sound pressure needed to produce cavitation in gassy water has been measured over a range of 0 to 30°C. Both plane progressive and focused waves of frequency one megacycle per second were used. The cavitation pressure threshold Pc is not a linear function of temperature, and increases by a factor of 2.5 between
W. Connolly, F. E. Fox
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Measurement of cavitational activity within ultrasonic baths

Journal of Dentistry, 1991
The formation of free iodine from the KI/CCl4 chemical dosimeter has been used to quantify the amount of cavitational activity occurring within a 25 kHz cleaning bath under various exposure conditions. The amount of activity occurring within the bath was related to the supply voltage to the cleaning bath, the time of exposure and the volume of solution.
A D, Walmsley, A R, Williams
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Evidence for ultrasonically induced cavitation in vivo

Physics in Medicine & Biology, 1981
The possibility of stable bubbles being produced during ultrasonic irradiation of a guinea-pig hind limb, has been examined using a pulse echo ultrasonic imaging technique, that can visualise, within a cross-section of the limb, both moving and stationary bubbles of diameters down to 10 mu m (Beck et al. 1978).
G R, ter Haar, S, Daniels
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