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Freezing-In of Ultrasonic Standing Waves in Diffusion Systems by the Concentration Zone Effect

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If a thermally generated dilatation is superimposed upon a path having a monotonic concentration gradient, the latter changes into a periodic system of zones with a higher concentration and density. This system of zones remains stable for some time. The present paper examines this “concentration zone effect” as applied to ultrasonic waves in liquids. In a continuous progressive wave it takes a longer time, until the thermal dilatation produces an effect independent of the wave length. In a stationary wave, which is produced in a path with monotonic concentration gradient, however, it is possible to produce the “concentration zone effect” in each half-wave length. As a consequence the striation produced by the ultrasonic wave is frozen-in, and continues for a longer spell of time after the sound source is switched off. This phenomenon of freezing-in of stationary ultrasonic waves in liquid diffusion systems can be realized in any system of miscible and soluble substances.
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Document Type: Research Article

Publication date: January 1, 1968

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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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