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Sound transmission in ultrasonic cleaning tanks at excess pressure

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The variation with time of the intensity of sound in water, perchloroethylene and freon is measured at 22 kHz at atmospheric pressure and at excess pressure. At atmospheric pressure there is in all three liquids a decrease in intensity with time, which can be largely eliminated by excess pressure, smaller than 1 kp/cm2 (= 9.81 ยท 104 Pa). Shortduration reductions in pressure during the excess-pressure phase prevent a pronounced decrease in the sound intensity during the period of high pressure.

The results may be interpreted on the basis of the following considerations: Above a certain power, the transmission of sound from the sound generator to the substance to be purified is accompanied by cavitation. The gas bubbles which are formed attenuate the sound waves transmitted to the substance to be purified. The degree of attenuation depends on the radius of the bubbles, which increases with time, and is particularly strong when their resonance frequency approaches the driving frequency of the sound generator. Excess pressure in the purification container reduces the radius of the bubbles, increases their resonant frequency and thereby diminishes their sound attenuation effect.
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Document Type: Research Article

Publication date: September 1, 1971

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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