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Issue 36, 2016
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Coupled dynamics of flow, microstructure, and conductivity in sheared suspensions

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Abstract

We propose a model for the evolution of the conductivity tensor for a flowing suspension of electrically conductive particles. We use discrete particle numerical simulations together with a continuum physical framework to construct an evolution law for the suspension microstructure during flow. This model is then coupled with a relationship between the microstructure and the electrical conductivity tensor. Certain parameters of the joint model are fit experimentally using rheo-electrical conductivity measurements of carbon black suspensions under flow over a range of shear rates. The model is applied to the case of steady shearing as well as time-varying conductivity of unsteady flow experiments. We find that the model prediction agrees closely with the measured experimental data in all cases.

Graphical abstract: Coupled dynamics of flow, microstructure, and conductivity in sheared suspensions

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Article information


Submitted
24 May 2016
Accepted
03 Aug 2016
First published
03 Aug 2016

This article is Open Access

Soft Matter, 2016,12, 7688-7697
Article type
Paper

Coupled dynamics of flow, microstructure, and conductivity in sheared suspensions

T. Olsen, A. Helal, G. H. McKinley and K. Kamrin, Soft Matter, 2016, 12, 7688
DOI: 10.1039/C6SM01199C

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