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Issue 3, 2016
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Shear thickening regimes of dense non-Brownian suspensions

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Abstract

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-contact interactions corroborate the model predictions, demonstrating both mechanisms of shear thickening, and showing that they can occur concurrently with carefully selected particle surface properties under certain flow conditions. Microstructural transitions associated with frictional shear thickening are presented. We find very distinctive divergences of both microstructural and dynamic variables with respect to volume fraction in the thickened and non-thickened states.

Graphical abstract: Shear thickening regimes of dense non-Brownian suspensions

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Publication details

The article was received on 15 Sep 2015, accepted on 05 Nov 2015 and first published on 06 Nov 2015


Article type: Paper
DOI: 10.1039/C5SM02326B
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Soft Matter, 2016,12, 914-924
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    Shear thickening regimes of dense non-Brownian suspensions

    C. Ness and J. Sun, Soft Matter, 2016, 12, 914
    DOI: 10.1039/C5SM02326B

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