Chaos and threshold for irreversibility in sheared suspensions

D. J. Pine (), J. P. Gollub, J. F. Brady () and A. M. Leshansky
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D. J. Pine: University of California
J. P. Gollub: University of California
J. F. Brady: California Institute of Technology
A. M. Leshansky: Technion - Israel Institute of Technology

Nature, 2005, vol. 438, issue 7070, 997-1000

Abstract: No turning back According to the laws of fluid motion, when a simple fluid or suspension of particles is slowly stirred then unstirred — imagine a spoon in a jar of honey — all parts of the system should miraculously return to their starting points. This is a consequence of the time-reversible equations of motion, at least for two-dimensional flows. But in more complex flows, such as those in three-dimensional or rigorously stirred systems, this delicate effect is destroyed. An investigation of a slowly sheared suspension of solid particles now reveals the microscopic processes behind this transition to irreversible behaviour. Beyond a concentration-dependent threshold strain, irreversibility sets in as a result of chaotic collisions between the particles.

Date: 2005
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DOI: 10.1038/nature04380

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