NDLI: Foam Self-Clarification Phenomenon: An Experimental Investigation

Content Provider	Springer Nature Link
Author	Shreiber, I. Ben Dor, G. Britan, A. Feklistov, V.
Copyright Year	2006
Abstract	This paper is focused on the capabilities of gas–liquid foams to attenuate acoustic waves. It is postulated that the sound attenuation phenomenon in foams is largely governed by the hydrodynamic resistance of the Plateau-Gibbs channels (PGC) to the flow of liquid through them. It is shown that the addition of solid particles to gas–liquid foams has opposite effects depending on the concentration of the added solid particles. As long as the concentration of the added solid particles is smaller than a certain critical value the sound attenuation coefficient increases and as a result in the sound velocity decreases. However, if the concentration of the added solid particles becomes larger than this critical value the attenuation coefficient decreases and the sound velocity increases. When the concentration of the solid particles reaches some critical value, the particles block the Plateau-Gibbs channels and stop the filtration. As a result the attenuation coefficient of the sound wave decreases while the sound velocity, in such three-phase foams, increases. The point at which the sound wave stops attenuating and its velocity starts to increase is known as the point of self-clarification. Based on this postulate and on the results of our preliminary tests the present study provides a plausible explanation to the above-mentioned contradicting effect, and the self- clarification phenomenon.
Ending Page	204
Page Count	6
Starting Page	199
File Format	PDF
ISSN	09381287
e-ISSN	14322153
Journal	Shock Waves
Issue Number	3-4
Volume Number	15
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-06-14
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Thermodynamics Fluids Solid particle-laden aqueous foams Engineering Thermodynamics, Transport Phenomena Condensed Matter Engineering Fluid Dynamics Sound attenuation Acoustics Acoustic wave attenuation Plateau-Gibbs channels
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Mechanical Engineering

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