Boundary layer (shear-band) in frustrated viscoplastic flows

Thibaud Chevalier (1) , Stéphane Rodts (1) , Xavier Chateau (2) , Jalila Boujlel (2) , Mathilde Maillard (3) , Philippe Coussot (1)

1 Physique des milieux poreux
2 Rhéophysique
3 navier umr 8205 - Laboratoire Navier

We show that frustrated creep flows of yield stress fluids give rise to a boundary layer, which takes the form of a liquid region of uniform significant thickness separating two solid regions. In this boundary layer the shear rate is approximately constant for a given flow rate and the layer thickness varies extremely slowly with the flow rate.

Mots clés: Viscoplasticity; yield stress; Viscous and viscoelastic instabilities; Deformation and plasticity

Domaines: Matériaux et structures en mécanique [physics.class-ph]; Matériaux et structures en mécanique [physics.class-ph]

Thibaud Chevalier, Stéphane Rodts, Xavier Chateau, Jalila Boujlel, Mathilde Maillard, et al.. Boundary layer (shear-band) in frustrated viscoplastic flows. EPL - Europhysics Letters, 2013, 102, pp.48102. ⟨10.1209/0295-5075/102/48002⟩. ⟨hal-00911356⟩