Volume 90, Number 4, May 2010
|Number of page(s)||6|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||07 June 2010|
Relaxation and flow in linearly sheared two-dimensional foams
Kamerlingh Onnes Lab, Universiteit Leiden - Postbus 9504, 2300 RA Leiden, The Netherlands, EU
2 School of Physics, Trinity College Dublin - Dublin 2, Ireland, EU
Corresponding author: firstname.lastname@example.org
Accepted: 5 May 2010
We probe the relation between rheology and shear-induced relaxation in experiments on two-dimensional foams at steady shear. The characteristic relaxation time tr, which we extract from the non-affine part of the bubble displacements, scales non-linearly with the local strain rate . In particular, the relative strength of the non-affine part grows when 0 —hence the foam flow is not quasistatic down to the lowest experimentally accessible shear rate. Furthermore, we establish a direct connection between the relaxation time scaling and the macroscopic rheology.
PACS: 47.57.Bc – Complex fluids and colloidal systems: Foams and emulsions / 83.60.Fg – Shear rate dependent viscosity / 83.80.Iz – Emulsions and foams
© EPLA, 2010
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