Physical modeling of the acoustic absorption characteristics of a particulate suspension



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Attenuation of acoustic waves in silicone rubber/particulate composite media is explicable in terms of a viscous damping mechanism. Urick"s equation for attenuation can be applied to this medium by inverting the P-wave Q of the rubber to the imaginary shear modulus, and deriving the equivalent viscosity at a particular angular frequency using Mehta"s relation. Comparison of experimental results and theoretical predictions yields good results for an RTV3120/Eccosphere system over an octave of frequencies from 120 kHz to 240 kHz. Attenuation coefficients are monotonically increasing functions of particle radius for the range 50 to 150 microns (100 to 300 microns diameter). This system can be used to physically model the attenuation of a clay-sized particulate suspension, when frequencies are kept low enough that there is no appreciable contribution from Rayleigh scattering.



Suspended sediments--Acoustic properties, Seismic waves