title: Sound velocity and attenuation in bubbly gels measured by transmission experiments.
abstract: Measurements of the phase velocity and attenuation of sound in concentrated samples of bubbly gels are presented. Hair gel was used as a matrix material to obtain well characterized distributions of bubbles. Ultrasonic measurements were conducted over a large range of frequencies, including the resonance frequencies of the bubbles. Surprisingly good agreement with Foldy's prediction was found, even for monodisperse samples at resonance frequencies, up to volume fraction of 1%. Beyond this concentration, the effects of high-order multiple scattering were observed. These results support the feasability of ultrasonic techniques to investigate the size distribution of bubbles in a weak gel or liquid.
authors.affiliation: Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada. valeroy77@yahoo.fr
authors.forename: Valentin
authors.initials: V
authors.lastname: Leroy
authors.forename: Anatoliy
authors.initials: A
authors.lastname: Strybulevych
authors.forename: John H
authors.initials: JH
authors.lastname: Page
authors.forename: Martin G
authors.initials: MG
authors.lastname: Scanlon
mesh_terms: D005240:Feasibility Studies; D005782:Gels; D006203:Hair Preparations; D006801:Humans; D013016:Sound; D014465:Ultrasonics
chemical_list: D005782:Gels; D006203:Hair Preparations