Sound and weak shock wave propagation in gas-liquid foams

Heat transfer in sound propagation and attenuation through gas–liquid polyhedral foams

“…The smaller of two values τ is selected in order to better satisfy the quasi-steady state condition (17), ωτ b 1: ωτ = {0.23, 0.08, 0.71} at ω / (2π) = {300, 600, 300} Hz for experimental data adopted from Refs. [7,11,12], respectively (see Fig. 3a, data from Ref.…”

“…1.0} · 10 − 3 m reported in Refs. [7,11,12], respectively, which start a series of experiments within the range of foam expansions. Thus, our predictions for R b0 are in fair agreement with Ref.…”

“…Short reviews of foam acoustics are given in Ref. [11,13]. The foam response to sound and weak shock waves demonstrates low dispersion of sound velocity along with high sound attenuation [7,11].…”

Coupled vibrations of a meniscus and liquid films

“…These shear rates and frequencies remain lower, however, than what is achieved in many industrial applications, such as the mitigation of shock and blast waves by aqueous foams (Goldfarb et al, 1997, Britan, Liverts & Ben-Dor, 2009, Del Prete et al, 2013, or the design of new probes of liquid foams based on their acoustic response. A related subject is the propagation of acoustic waves through foams, which has been surprisingly considered only rather recently (Moxon, Torrance & Richardson, 1988, Mujica & Fauve, 2002, Kann, 2005, Pierre et al, 2013, Pierre, Dollet & Leroy, 2014.…”

Melde’s Experiment on a Vibrating Liquid Foam Microchannel

“…Their acoustic properties are not intermediate between the ones of their constitutive liquid and gas [2]. Foams can both act as metamaterials for given frequencies [3] and be used as efficient barriers against large amplitude or blast waves [4,5]. They also propagate shear waves in bulk [6,7] or at the interfaces [8], and the existence of supershear Rayleigh waves has been proved following the impact of a projectile at high velocity [8].…”