Yielding and large deviations in micellar gels: a model

Nandi, Saroj Kumar and Chakraborty, Bulbul and Sood, AK and Ramaswamy, Sriram (2013) Yielding and large deviations in micellar gels: a model. In: JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT .

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Abstract

We present a simple model that can be used to account for the rheological behaviour observed in recent experiments on micellar gels. The model combines attachment detachment kinetics with stretching due to shear, and shows well-defined jammed and flowing states. The large-deviation function (LDF) for the coarse-grained velocity becomes increasingly non-quadratic as the applied force F is increased, in a range near the yield threshold. The power fluctuations are found to obey a steady-state fluctuation relation (FR) at small F. However, the FR is violated when F is near the transition from the flowing to the jammed state although the LDF still exists; the antisymmetric part of the LDF is found to be nonlinear in its argument. Our approach suggests that large fluctuations and motion in a direction opposite to an imposed force are likely to occur in a wider class of systems near yielding.

Item Type:	Journal Article
Publication:	JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
Publisher:	IOP PUBLISHING LTD
Additional Information:	Copyright for this article belongs to the IOP PUBLISHING LTD, ENGLAND.
Keywords:	fluctuations (theory); large deviations in non-equilibrium systems; rheology and transport properties; jamming and packing
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	15 Apr 2013 11:55
Last Modified:	15 Apr 2013 11:55
URI:	http://eprints.iisc.ac.in/id/eprint/46403

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