Resonant Acoustic Propagation and Negative Density in Liquid Foams

被引:57
作者
Pierre, Juliette [1 ]
Dollet, Benjamin [2 ]
Leroy, Valentin [1 ]
机构
[1] Univ Paris Diderot, Lab Mat & Syst Complexes, CNRS UMR 7057, F-75205 Paris 13, France
[2] Univ Rennes 1, Inst Phys Rennes, CNRS UMR 6251, F-35042 Rennes, France
关键词
SOAP FILMS; SOUND; DISPERSIONS; ATTENUATION; ULTRASOUND; PRESSURE; VELOCITY; WAVES; WATER;
D O I
10.1103/PhysRevLett.112.148307
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We measured the dispersion relation for acoustic longitudinal waves in liquid foams, over a broad frequency range (60-600 kHz). Strong dispersion was found, with two nondispersive behaviors, separated by a negative density regime. A new model, based on the coupled displacements of films, liquid channels, and gas in the foam, rationalizes all the experimental findings.
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页数:5
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