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Start Over Descriptor "non-brownian suspensions" Database Complementary Index
2 results on '"non-brownian suspensions"'

1. Shear‐induced migration and axial development of particles in channel flows of non‐Brownian suspensions.

Author

Rashedi, Ahmadreza, Sarabian, Mohammad, Firouznia, Mohammadhossein, Roberts, Dallas, Ovarlez, Guillaume, and Hormozi, Sarah

Subjects
CHANNEL flow, GRANULAR flow, NEWTONIAN fluids, PARTICLE image velocimetry, WIENER processes, SHEAR flow
Abstract

We present an experimental study on the shear‐induced migration and axial development of particles in the channel flows of non‐Brownian suspensions. The suspending fluid is Newtonian. We investigate fracturing flows with a Hele‐Shaw type scaling through building a unique channel setup and an advanced optical system. The local particle concentration profiles are measured via the refractive‐index matching technique for a wide range of bulk volume fraction, that is, 0.1≤ϕ¯b≤0.5. Simultaneously, the particle image velocimetry is performed to determine the velocity profile of the particle phase. We compare our experimental results with the available two‐phase continuum frameworks and show discrepancies and similarities in the fully developed and axial development of the solid volume fraction profiles. We discuss directions in which the continuum frameworks require improvements. [ABSTRACT FROM AUTHOR]

Published
2020
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2. Dependence of Suspension Complex Viscosity on Frequency: Strain-controlled vs. Stress-controlled Tests.

Author

Martone, Raffaella, Paduano, Liana P., Carotenuto, Claudia, and Minale, Mario

Subjects
VISCOSITY, BROWNIAN motion, SUSPENSIONS (Chemistry), VISCOELASTIC materials, HYDRODYNAMICS
Abstract

The apparent complex viscosity of a non-Brownian Newtonian concentrated suspension is known to be a nonmonotonic function of the applied strain, attaining a minimum at a relative strain of about 100%. This behaviour can be nicely described in the framework of the Stokesian dynamics, which also predicts the independence of the complex viscosity on the applied frequency. Despite this, recently it was experimentally shown that the apparent viscosity of a concentrated non-Brownian suspension is function of the applied frequency in experiments run imposing a constant stress (Carotenuto et al. AIP Conference Proceedings 1599, 258, 2014). This behaviour is quite unexpected and we here confirm it in more canonical experiments run imposing a constant strain. [ABSTRACT FROM AUTHOR]

Published
2018
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