Effective Medium Model for Ultrasonic Attenuation Due to the Thermo-Elastic Effect in Concentrated Emulsions
Résumé
In this article, we deal with the propagation of ultrasonic waves in monodisperse concentrated oil–in–water emulsions. Using the approximation of Isakovich, we propose two different models, a mirror model and a core–shell model, aiming to describe the temperature field in the dense medium and to supply a correct expression of the ultrasonic wave vector. The comparison between experimental data and theoretical models shows that the core–shell model leads to a very accurate description of the ultrasonic attenuation, in a wide range of frequencies and concentrations, in the case where the thermo–elastic effect, due to the scattering of thermal waves by the particles, is the dominant loss mechanism.
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