Blast wave attenuation in liquid foams: role of gas and evidence of an optimal bubble size
Résumé
Liquid foams are excellent systems to mitigate pressure waves such as acoustic or blast waves. Theunderstanding of the underlying dissipation mechanisms however still remains an active matter ofdebate. In this paper, we investigate the attenuation of a weak blast wave by a liquid foam. The wave isproduced with a shock tube and impacts a foam, with a cylindrical geometry. We measure the waveattenuation and velocity in the foam as a function of bubble size, liquid fraction, and the nature of thegas. We show that the attenuation depends on the nature of the gas and we experimentally evidence amaximum of dissipation for a given bubble size. All features are qualitatively captured by a model basedon thermal dissipation in the gas.
Domaines
Matière Molle [cond-mat.soft]
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Blast wave attenuation in liquid foams monloubou16_hal-accepted.pdf (872.58 Ko)
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