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Experimental determination of the damping of pulsating air bubbles in water

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1. The experiments showed that the damping of pulsating air bubbles in water for bubbles with resonant frequencies up to 100 kc/s can be explained theoretically by the energy losses due to sound radiation and heat conduction.

2. From the result of the first part of the measurements, the validity of Minnaert's relation between radius and resonant frequency of the bubbles for frequencies higher than 50 kc/s became doubtful. Further investigations including direct measurements of the radii showed that the resonant frequencies of bubbles are considerably influenced by dust particles at higher frequencies. By association of dust particles at the surface of a bubble in the frequency range of 100 kc/s, the resonant frequency may rise up to 1.5 times the value given by Minnaert's formula.

3. The damping of ayo bubbles is not influenced by association of dust particles.

4. In liquids with small surface tension, where no dust particles remain at the surface, all bubbles showed normal properties.

5. The damping due to viscosity seems to be considerably smaller than would be expected from Lamb's theory.
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Document Type: Research Article

Publication date: January 1, 1953

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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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