Liquid foam and sound
ORAL
Abstract
How does an acoustic wave dissipate when it propagates through a collection of thin liquid films loaded by the surrounding air and a massive liquid skeleton ?
Liquid foams are complex gas-liquid systems ubiquitous in industrial, food, geophysical context… A liquid foam contains a low liquid fraction (<30%). Its rigidity is due to a liquid skeleton, containing the most important part of the liquid fraction and linked by thin liquid films. The bubble size distribution is strongly polydisperse.
These last years we showed, over a large frequency range, how a liquid foam was behaving when insonified1. We showed that liquid foams act as natural and 3D isotropic acoustic metamaterials. Moreover, this work confirmed that liquid foams have important soundproofing properties1,2.
Recently, we have pushed forward our investigations on the origin of acoustic attenuation in liquid foams and we have revealed that losses are due to both thermal and viscous losses3.
1. J. Pierre, B. Dollet, V. Leroy, PRL 112, 148307 (2014).
2. M. Monloubou, A. Saint-Jalmes, B. Dollet, I. Cantat, EPL, 112(3), 34001 (2015)
3. J. Pierre, C. Gaulon, C. Derec, F.Elias, V. Leroy, EPJE 40, 73 (2017)
Liquid foams are complex gas-liquid systems ubiquitous in industrial, food, geophysical context… A liquid foam contains a low liquid fraction (<30%). Its rigidity is due to a liquid skeleton, containing the most important part of the liquid fraction and linked by thin liquid films. The bubble size distribution is strongly polydisperse.
These last years we showed, over a large frequency range, how a liquid foam was behaving when insonified1. We showed that liquid foams act as natural and 3D isotropic acoustic metamaterials. Moreover, this work confirmed that liquid foams have important soundproofing properties1,2.
Recently, we have pushed forward our investigations on the origin of acoustic attenuation in liquid foams and we have revealed that losses are due to both thermal and viscous losses3.
1. J. Pierre, B. Dollet, V. Leroy, PRL 112, 148307 (2014).
2. M. Monloubou, A. Saint-Jalmes, B. Dollet, I. Cantat, EPL, 112(3), 34001 (2015)
3. J. Pierre, C. Gaulon, C. Derec, F.Elias, V. Leroy, EPJE 40, 73 (2017)
*Support from French Agence National de la Recherche (project SAMOUSSE, ANR-11-BS09-001)
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Presenters
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Juliette Pierre
- Institut d'Alembert - CNRS