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

Published online by Cambridge University Press:  27 May 2005

E. JANIAUD  and
F. GRANER
E. JANIAUD
Affiliation:
Laboratoire des Milieux Désordonnés et Hétérogènes, case 78, Université Paris 6 and CNRS UMR 7603, 140 rue de Lourmel, 75015 Paris, France Université Paris 7, Denis Diderot, Fédération de Recherche FR2438 Matière et Systèmes Complexes, 2 place Jussieu, 75251 Paris Cedex 05, France Present address: Foam Physics, Department of Physics, Trinity College, Dublin 2, Ireland.
F. GRANER
Affiliation:
Laboratoire de Spectrométrie Physique, CNRS UMR 5588 et Université Grenoble I, BP 87, F-38402 St Martin d'Hères Cedex, France
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Abstract

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.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 532 , 10 June 2005 , pp. 243 - 267
Copyright
© 2005 Cambridge University Press

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