Intrinsic viscosity of a suspension of weakly Brownian ellipsoids in shear

G. Almondo, J. Einarsson, J. R. Angilella, and B. Mehlig
Phys. Rev. Fluids 3, 064307 – Published 26 June 2018

Abstract

We analyze the angular dynamics of triaxial ellipsoids in a shear flow subject to weak thermal noise. By numerically integrating an overdamped angular Langevin equation, we find the steady angular probability distribution for a range of triaxial particle shapes. From this distribution we compute the intrinsic viscosity of a dilute suspension of triaxial particles. We determine how the viscosity depends on particle shape in the limit of weak thermal noise. While the deterministic angular dynamics depends very sensitively on particle shape, we find that the shape dependence of the intrinsic viscosity is weaker, in general, and that suspensions of rodlike particles are the most sensitive to breaking of axisymmetry. The intrinsic viscosity of a dilute suspension of triaxial particles is smaller than that of a suspension of axisymmetric particles with the same volume and the same ratio of major to minor axis lengths.

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  • Received 19 May 2017

DOI:https://doi.org/10.1103/PhysRevFluids.3.064307

©2018 American Physical Society

Physics Subject Headings (PhySH)

  1. Physical Systems
Fluid Dynamics

Authors & Affiliations

G. Almondo1, J. Einarsson1, J. R. Angilella2, and B. Mehlig1

  • 1Department of Physics, University of Gothenburg, 41296 Gothenburg, Sweden
  • 2ESIX, Université de Caen, 50130 Cherbourg, France

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Vol. 3, Iss. 6 — June 2018

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