Boundary layer (shear-band) in frustrated viscoplastic flows
Université Paris-Est, Laboratoire Navier - 2 Allée Kepler, 77420 Champs sur Marne, France, EU
Received: 4 February 2013
Accepted: 15 May 2013
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.
PACS: 83.60.La – Viscoplasticity; yield stress / 47.20.Gv – Viscous and viscoelastic instabilities / 62.20.F− –
© EPLA, 2013