Rate Dependence and Role of Disorder in Linearly Sheared Two-Dimensional Foams
arXiv:0711.4024 · doi:10.1103/PhysRevLett.101.058301
Abstract
The shear flow of two dimensional foams is probed as a function of shear rate and disorder. Disordered foams exhibit strongly rate dependent velocity profiles, whereas ordered foams show rate independence. Both behaviors are captured quantitatively in a simple model based on the balance of the time-averaged drag forces in the foam, which are found to exhibit power-law scaling with the foam velocity and strain rate. Disorder modifies the scaling of the averaged inter-bubble drag forces, which in turn causes the observed rate dependence in disordered foams.
4 Figures, 4 pages
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