Journal
SOFT MATTER
Volume 12, Issue 3, Pages 914-924Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5sm02326b
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Funding
- Engineering and Physical Sciences Research Council (EPSRC)
- Johnson Matthey through a CASE studentship award
- Engineering and Physical Sciences Research Council [1308450] Funding Source: researchfish
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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-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.
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