Attenuation of Sound in Suspensions and Gels

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Abstract
Measurements were made of sound attenuation in fresh water suspensions of platelet- and needle-shaped particles. The frequency range covered was 150 to 1500 kHz. Concentrations ranged from less than 1% to more than 20% by volume. Platelet-shaped particles produced higher values for attenuation than needle-shaped particles at the same volume concentration. Sound attenuation at concentrations light enough to gel was the same in the gel as in a suspension of the same concentration. This is in agreement with the thixotropic characteristic of some gels. The effect of inorganic salts flocculation and syneresis in gels may lead to higher particle concentrations and resulting different acoustic properties of sea bottoms.

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