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

نویسندگان

  • B M Guy
  • M Hermes
  • W C K Poon
چکیده

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.

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عنوان ژورنال:
  • Physical review letters

دوره 115 8  شماره 

صفحات  -

تاریخ انتشار 2015