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We present macroscopic experiments that show how the decay phenomenon affects the sound wave mitigation in wet aqueous foams and how both effects depend on the mass concentration of added particles of coal fly ash. To measure the mitigation of a sound wave as a function of the drainage time and particle concentration both a standing-wave and a single-pulse methods were used. To the best of our knowledge,...
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...
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