HAL : hal-00467198, version 1

arXiv : 1003.5750

DOI : 10.1103/PhysRevLett.104.128301

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Physical Review Letters 104 (2010) 128301

Shear induced drainage in foamy yield-stress fluids

Julie Goyon 1, 2, François Bertrand 1, Olivier Pitois 2, Guillaume Ovarlez 1

(2010)

Shear induced drainage of a foamy yield stress fluid is investigated using MRI techniques. Whereas the yield stress of the interstitial fluid stabilizes the system at rest, a fast drainage is observed when a horizontal shear is imposed. It is shown that the sheared interstitial material behaves as a viscous fluid in the direction of gravity, the effective viscosity of which is controlled by shear in transient foam films between bubbles. Results provided for several bubble sizes are not captured by the R^2 scaling classically observed for liquid flow in particulate systems, such as foams and thus constitute a remarkable demonstration of the strong coupling of drainage flow and shear induced interstitial flow. Furthermore, foam films are found to be responsible for the unexpected arrest of drainage, thus trapping irreversibly a significant amount of interstitial liquid.

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

Équipe de recherche : Milieux poreux Rhéophysique

Domaine

:

Physique/Matière Condensée/Matière Molle

Mots Clés : Foam – Emulsion – Yield stress – Drainage – Shear induced drainage

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Contributeur : Guillaume Ovarlez <>

Soumis le : Vendredi 26 Mars 2010, 11:17:52

Dernière modification le : Mardi 6 Avril 2010, 14:47:28