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* Corresponding author 1 MSC - Matière et Systèmes Complexes

Abstract : Liquid foams are mixtures of gas and liquid, with a liquid volume fraction $ \phi {l} {\leq}0.3 $, stabilized with surfactants. Because of their composition and structure, liquid foams are very complex and unstable media with particular acoustical properties. Experimental studies are not very numerous; they have shown a strong dependence of the velocity and attenuation of sound on parameters such as $ \phi {l}$ and the average bubble size 1. The existent theories explain a part of the acoustic behaviour of liquid foams, but are not exactly in accordance with the experimental data found in the literature. For example, the experimental phase velocities Phys. Rev. E 66 2002 021404 are larger than the velocities predicted by the Wood approximation A. B. Wood, A Textbook of sound Bell, London, 1932. We present an experimental investigation of liquid foams by an ultrasonic setup based on two broadband air transducers 40-200kHz. The acoustic properties are deduced from the reflected signal. We discuss experimental results with commercial shaving foams and custom-made controlled foams and compare them with available models. The evolution of the acoustic properties with the aging of the foams is also discussed.

keyword : complex media ultrasonic setup

Author: Juliette Pierre - Florence Elias Cyprien Gay - Caroline Derec - Valentin Leroy -

Source: https://hal.archives-ouvertes.fr/


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