Results 251 to 260 of about 18,396 (294)

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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Cavitation Produced by Ultrasonics: Theoretical Conditions for the Onset of Cavitation

Proceedings of the Physical Society. Section B, 1951
An attempt is made to define theoretically the conditions for the appearance of cavitation in liquids subjected to alternating pressure changes. It is found that cavitation is restricted to a definite range of variations of the following parameters: (i) alternating pressure amplitude, (ii) frequency of the pressure wave, (iii) radius of the bubble ...
E A Neppiras, B E Noltingk
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Chemical Dosimetry of Ultrasonic Cavitation

1981 Ultrasonics Symposium, 1981
meters to evaluate the efficacy of various solvents in producing cavitational sonochemistry. Aqueous and alcoholic solvent systems-are easily standardized using the oxidation of I to 13 by spectrophotometry. The more common addition of CC14 in order to increase rates of 1) production dramatically reduces the reproducibility of this system, which in our
K.S. Suslick, P.F. Schubert, J.W. Goodale   +2 more
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Selective Ultrasonic Cavitation on Patterned Hydrophobic Surfaces

Angewandte Chemie International Edition, 2010
Ultrasound can create cavitation bubbles that upon collapse cause extreme temperatures and pressures. Sonochemistry therefore carries much promise as an environmentally friendly method to carry out chemical processes at ultrahigh temperatures (ca. 5000 K), and pressures (ca. 1000 atm), but with a reactor at near-ambient conditions.
Belova, V., Gorin, D., Shchukin, D., Möhwald, H.   +3 more
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A cell for ultrasonic cavitation experiments

Journal of Physics E: Scientific Instruments, 1968
A cell for ultrasonic irradiation of liquids, employed in sonoluminescence experiments, is described. The cell has been used in a frequency range 04-3 MHz with hydrostatic pressure variations from 10−3 to 3 atm, temperatures ranging from -40 to +90°C and maximum average sound energy density corresponding to the intensity of a progressive wave beam of ...
G Iernetti, A Barattini
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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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Ultrasonic cavitation induced by neutrons

Nuclear Instruments and Methods, 1963
Neutrons from a Pu-Be source nucleate cavitation in the liquid CC1F3 (Preon 11) when it is excited with ultrasonic pressure waves corresponding to ±5 atm at 25 kHz. The bubbles grow to visible size within one ultrasonic period and disappear in a few tens of cycles. Standing-wave bubble patterns were observed.
B. Hahn, R. N. Peacock
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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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On the impact of ultrasonic cavitation bubbles

Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2011
The main purpose of this study was to determine the impulse of a bubble on a solid surface or the amount of energy transmitted to the surface by the bubble. To do this, the results of previous numerical studies were used to derive a relationship between the speed of microjet and acoustic pressure amplitude.
A Abdullah, M Malaki, E Baghizadeh
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