Constant Stress and Pressure Rheology of Colloidal Suspensions
We study the constant stress and pressure rheology of dense hard-sphere colloidal suspensions using Brownian dynamics simulation. Expressing the flow behavior in terms of the friction coefficient—the ratio of shear to normal stress—reveals a shear arrest point from the collapse of the rheological data in the non-Brownian limit. The flow curves agree quantitatively (when scaled) with the experiments of Boyer et al. [Phys. Rev. Lett. 107, 188301 (2011)]. Near suspension arrest, both the shear and the incremental normal viscosities display a universal power law divergence. This work shows the important role of jamming on the arrest of colloidal suspensions and illustrates the care needed when conducting and analyzing experiments and simulations near the flow-arrest transition.
© 2015 American Physical Society. Received 23 July 2015; revised manuscript received 22 August 2015; published 7 October 2015. We thank O. Pouliquen for providing information on their experiments. M.W. gratefully acknowledges support from the Natural Sciences and Engineering Research Council of Canada (NSERC) through a Postgraduate Scholarship (PGS) and the National Science Foundation (NSF) Grant No. CBET-1337097.
Published - PhysRevLett.115.158301.pdf
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