Flow and evolution of ice-sucrose crystal mushes

Gilbert, Andrew J. and Oppong, Felix K. and Farr, Robert S. (2017) Flow and evolution of ice-sucrose crystal mushes. Physical Review E statistical, nonlinear, and soft matter physics, 95 (4). ISSN ISSN: 1539-3755, ESSN: 1550-2376 DOI 10.1103/PhysRevE.95.042606

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Official URL: http://doi.org/10.1103/PhysRevE.95.042606

Abstract

We study the rheology of suspensions of ice crystals at moderate to high volume fractions in a sucrose solution in which they are partially soluble, a model system for a wide class of crystal mushes or slurries. Under step changes in shear rate, the viscosity changes to a relaxed value over several minutes, in a manner well fitted by a single exponential. The behavior of the relaxed viscosity is power-law shear thinning with shear rate, with an exponent of −1.76±0.25, so that shear stress falls with increasing shear rate. On longer time scales, the crystals ripen (leading to a falling viscosity) so that the mean radius increases with time to the power 0.14±0.07. We speculate that this unusually small exponent is due to the interaction of classical ripening dynamics with abrasion or breakup under flow. We compare the rheological behavior to mechanistic models based on flow-induced aggregation and breakup of crystal clusters, finding that the exponents can be predicted from liquid phase sintering and breakup by brittle fracture.

Item Type: Article
Uncontrolled Keywords: 2017AREP; IA72;
Subjects: 05 - Petrology - Igneous, Metamorphic and Volcanic Studies
Divisions: 05 - Petrology - Igneous, Metamorphic and Volcanic Studies
08 - Green Open Access
99 - Other
Journal or Publication Title: Physical Review E statistical, nonlinear, and soft matter physics
Volume: 95
Identification Number: 10.1103/PhysRevE.95.042606
Depositing User: Sarah Humbert
Date Deposited: 13 Apr 2017 17:03
Last Modified: 28 Apr 2017 16:31
URI: http://eprints.esc.cam.ac.uk/id/eprint/3931

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