Towards a Unified Description of the Rheology of Hard-Particle Suspensions

B. M. Guy*, M. Hermes, W. C. K. Poon

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The rheology of suspensions of Brownian, or colloidal, particles (diameter d≲1  μm) differs markedly from that of larger grains (d≳50  μm). Each of these two regimes has been separately studied, but the flow of suspensions with intermediate particle sizes (1  μm≲d≲50  μm), which occur ubiquitously in applications, remains poorly understood. By measuring the rheology of suspensions of hard spheres with a wide range of sizes, we show experimentally that shear thickening drives the transition from colloidal to granular flow across the intermediate size regime. This insight makes possible a unified description of the (noninertial) rheology of hard spheres over the full size spectrum. Moreover, we are able to test a new theory of friction-induced shear thickening, showing that our data can be well fitted using expressions derived from it.

Original languageEnglish
Article number088304
Number of pages5
JournalPhysical Review Letters
Volume115
Issue number8
Early online date20 Aug 2015
DOIs
Publication statusPublished - 21 Aug 2015

Keywords

  • SPHERE COLLOIDAL DISPERSIONS
  • CONCENTRATED SUSPENSIONS
  • DENSE SUSPENSIONS
  • SHEAR
  • FLOW
  • TRANSITION
  • DILATANCY
  • FORCE
  • STATE

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