Foam in a two-dimensional Couette shear: a local measurement of bubble deformation

被引:36
作者
Janiaud, E
Graner, F
机构
[1] CNRS, UMR 5588, Spectrometrie Phys Lab, F-38042 St Martin Dheres, France
[2] Univ Grenoble 1, F-38042 St Martin Dheres, France
[3] Univ Paris 06, Lab Milieux Desordonnes & Heterogenes, F-75015 Paris, France
[4] CNRS, UMR 7603, F-75015 Paris, France
[5] Univ Paris 07, Federat Rech Mat & Syst Complexes FR2438, F-75251 Paris, France
关键词
D O I
10.1017/S0022112005004052
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
We re-analyse experiments on a foam sheared in a two-dimensional Couette geometry. We characterize the bubble deformation by a texture tensor. Our measurements are local in time: they show two regimes, one transient and one stationary. They provide both the average and fluctuations of the anisotropy. Measurements are also local in space: they show that both the deformation and the elastic contribution to the stress field do not localize, varying smoothly across the shear gap. We can thus describe the foam as a continuous medium with elastic properties.
引用
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页码:243 / 267
页数:25
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