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Europhysics Letters (EPL) 91 (2010) 68005
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Investigation of shear banding in three-dimensional foams
Guillaume Ovarlez 1, Kapil Krishan 2, 3, Sylvie Cohen-Addad 2
(2010)

We study the steady flow properties of different three-dimensional aqueous foams in a wide gap Couette geometry. From local velocity measurements through Magnetic Resonance Imaging techniques and from viscosity bifurcation experiments, we find that these foams do not exhibit any observable signature of shear banding. This contrasts with two previous results (Rodts et al., Europhys. Lett., 69 (2005) 636 and Da Cruz et al., Phys. Rev. E, 66 (2002) 051305); we discuss possible reasons for this dicrepancy. Moreover, the foams we studied undergo steady flow for shear rates well below the critical shear rate recently predicted (Denkov et al., Phys. Rev. Lett., 103 (2009) 118302). Local measurements of the constitutive law finally show that these foams behave as simple Herschel-Bulkley yield stress fluids.
1 :  Laboratoire Navier
Ecole des Ponts ParisTech – CNRS : UMR8205 – IFSTTAR
2 :  Laboratoire de Physique des Matériaux Divisés et des Interfaces (LPMDI)
Université Paris-Est Marne-la-Vallée (UPEMLV) : EA7264
3 :  School of Physical Sciences
Jawaharlal Nehru University
Rhéophysique
Physique/Matière Condensée/Matière Molle
Foams – shear-banding – constitutive law
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