Sheared foam as a supercooled liquid?
Information Technology Laboratory, NIST - Gaithersburg, MD 20899, USA
2 Department of Chemistry and Biochemistry, University of California Los Angeles, CA 90095, USA
Accepted: 1 November 1999
We conduct numerical simulations on a simple model of a two-dimensional steady-state sheared foam, and define a quantity Γ that measures stress fluctuations in the constant-area system. This quantity reduces to the temperature in an equilibrium system. We find that the relation between the viscosity and Γ is the same as that between viscosity and temperature in a very different system, namely a supercooled liquid. This is the first evidence of a common phenomenon linking these two systems.
PACS: 64.70.Pf – Glass transitions / 83.50.Ax – Steady shear flows / 83.70.Hq – Heterogeneous liquids: suspensions, dispersions, emulsions, pastes, slurries, foams, block copolymers, etc
© EDP Sciences, 2000