Unsteady flow and particle migration in dense, non-Brownian suspensions
نویسندگان
چکیده
منابع مشابه
Unsteady flow and particle migration in dense, non-Brownian suspensions
We present experimental results on dense corn-starch suspensions as examples of non-Brownian, nearly hard particles that undergo continuous and discontinuous shear thickening (DST) at intermediate and high densities, respectively. Our results offer strong support for recent theories involving a stress-dependent effective contact friction among particles. We show, however, that in the DST regime...
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A consensus is emerging that discontinuous shear thickening (DST) in dense suspensions marks a transition from a flow state where particles remain well separated by lubrication layers, to one dominated by frictional contacts. We show here that reasonable assumptions about contact proliferation predict two distinct types of DST in the absence of inertia. The first occurs at densities above the j...
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We propose a unifying rheological framework for dense suspensions of non-Brownian spheres, predicting the onsets of particle friction and particle inertia as distinct shear thickening mechanisms, while capturing quasistatic and soft particle rheology at high volume fractions and shear rates respectively. Discrete element method simulations that take suitable account of hydrodynamic and particle...
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Shear induced particle migration of 2 μm diameter spherical colloidal particles flowing through rectangular capillary tubes (50 μm × 500 μm cross section) is studied by confocal microscopy. The confocal microscope allows imaging of the flowing particles far from the walls of the tube, at particle velocities up to 8000 μm s−1. The particle volume fraction is varied from φ = 0.05–0.34, and the fl...
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ژورنال
عنوان ژورنال: Journal of Rheology
سال: 2016
ISSN: 0148-6055,1520-8516
DOI: 10.1122/1.4953814