Spatial cooperativity in soft glassy flows
Goyon, J., Colin, A., Ovarlez, G., Ajdari, A., Bocquet, L., Nature 454 (2008).
spatial cooperativity, glass, velocity profile, shear stress, shear strain, Couette cell
A general feature of glassy materials is a strong nonlinear flow rule relating stress and strain. This feature is no well-documented and poorly understood. Many have tried to understand the glass transition by studying the dynamical heterogeneities in glass-forming materials, but how these heterogeneities affect flow remains unclear. Using a local velocity measurement technique, the authors study the local flow of a film of confined glassy material.
The authors test flow in two main geometries: shear planar flow in a wide gap Couette cell, and pressure driven planar flow