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A model for the shear viscosity of non-colloidal suspensions with Newtonian matrix fluids

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Abstract

We present a model for the shear viscosity of non-colloidal suspensions with Newtonian matrix fluids. The model is based on the original idea first presented by Brinkman (Applied Sci Research A1:27-34. 1947) for the viscous force exerted by a flowing fluid on a dense swarm of spherical particles. In particular, we consider an inertialess suspension in which the mean flow is driven by a pressure difference, and simultaneously, the suspension is subject to simple shear. Assuming steady state, incompressibility and taking into account a resistance force which is generated due to the presence of the particles in the flow, the three-dimensional governing equations for the mean flow around a single spherical particle are solved analytically. Self-consistency of the model provides a relationship between the resistance parameter and the volume fraction of the solid phase. A volume, or an ensemble, averaging of the total stress gives the bulk properties and an expression for the relative (bulk) viscosity of the suspension. The viscosity expression reduces to the Einstein limit for dilute suspensions and agrees well with empirical formulas from the literature in the semi-dilute and concentrated regimes. Since the model is based on a single particle and its average interaction with the other particles is isotropic, no normal stress differences can be predicted. A possible method of addressing this problem is provided in the paper.

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Acknowledgment

We thank the Australian Research Council for supporting part of this work via Grant DP110103414.

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Authors and Affiliations

  1. Department of Mathematics, University of the Aegean, Karlovassi, Samos, 83200, Greece

    Kostas D. Housiadas

  2. School of Aerospace, Mechanical and Mechatronic Engineering, University of Sydney, Sydney, NSW, 2006, Australia

    Roger I. Tanner

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  1. Kostas D. Housiadas
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  2. Roger I. Tanner
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Correspondence to Kostas D. Housiadas.

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Housiadas, K.D., Tanner, R.I. A model for the shear viscosity of non-colloidal suspensions with Newtonian matrix fluids. Rheol Acta 53, 831–841 (2014). https://doi.org/10.1007/s00397-014-0800-4

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  • DOI: https://doi.org/10.1007/s00397-014-0800-4

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