Crossover between Equilibrium and Shear-controlled Dynamics in Sheared Liquids

Details Crossover between Equilibrium and Shear-controlled Dynamics in Sheared Liquids Crossover between Equilibrium and Shear-controlled Dynamics in Sheared Liquids

2002-05-09

arxiv.org/abs/cond-mat/0205182v1

Phys. Rev. E 66, 061505 (2002)

Physics

Condensed Matter

Soft Condensed Matter

14 pages, 5 figures

Scientific paper

10.1103/PhysRevE.66.061505

We present a numerical simulation study of a simple monatomic Lennard-Jones liquid under shear flow, as a function of both temperature and shear rate. By investigating different observables we find that i) It exists a line in the (temperature-shear) plane that sharply marks the boarder between an ``equilibrium'' and a ``shear-controlled'' region for both the dynamic and the thermodynamic quantities; and ii) Along this line the structural relaxation time, is proportional to the inverse shear rate, i.e. to the typical time-scale introduced by the shear flow. Above the line the liquid dynamics is unaffected by the shear flow, while below it both temperature and shear rate control the particle motion.

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