Phys. Rev. Lett. 100, 138301 (2008) [4 pages]Viscous Friction in Foams and Concentrated Emulsions under Steady ShearReceived 30 April 2007; revised 6 January 2008; published 3 April 2008 We present a model for the viscous friction in foams and concentrated emulsions, subject to steady shear flow. First, we calculate the energy dissipated due to viscous friction inside the films between two neighboring bubbles or drops, which slide along each other in the flow. Next, from this energy we calculate the macroscopic viscous stress of the sheared foam or emulsion. The model predictions agree well with experimental results obtained with foams and emulsions. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.138301
DOI:
10.1103/PhysRevLett.100.138301
PACS:
83.80.Iz, 47.57.Bc, 82.70.Kj, 82.70.Rr
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