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Normal stress distribution in highly concentrated suspensions undergoing squeeze flow

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Abstract

Using pressure-sensitive films, the normal stress distribution is measured in suspensions of glass spheres in a Newtonian liquid undergoing constant-force squeeze flow. At volume fractions of solids up to 0.55, the normal stress distribution is independent of volume fraction and almost identical to the parabolic pressure distribution predicted for Newtonian fluids. However, at higher volume fractions, the normal stresses become an order of magnitude larger near the center and very low beyond that region. At these high volume fractions, the normal stresses decrease in the outer regions and increase in the inner regions as the squeezing proceeds. The normal stress distribution that results when the glass spheres without any fluid are subjected to squeeze flow is very similar to that for suspensions with volume fractions above 0.55, suggesting that the cause for the drastic changes in the normal stress distribution is the jamming of the particles in the suspension.

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Acknowledgements

We are grateful to Rick Blunk of General Motors for suggesting the use of pressure-sensitive films for this purpose. We are also grateful to Ian Wilson and Sarah Rough of the Department of Chemical Engineering and Biotechnology at the University of Cambridge for their helpful comments on an earlier draft of this paper. This work was partially supported by the NSF I/UCRC Center for Fuel Cells and the NSF REU program at the University of South Carolina.

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Authors and Affiliations

  1. Department of Chemical Engineering, University of South Carolina, Columbia, SC, 29208, USA

    Mohsen Nikkhoo, Khosrow Khodabandehlou, LeAnne Brozovsky & Francis Gadala-Maria

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  1. Mohsen Nikkhoo
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  2. Khosrow Khodabandehlou
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  3. LeAnne Brozovsky
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  4. Francis Gadala-Maria
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Correspondence to Francis Gadala-Maria.

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Nikkhoo, M., Khodabandehlou, K., Brozovsky, L. et al. Normal stress distribution in highly concentrated suspensions undergoing squeeze flow. Rheol Acta 52, 155–163 (2013). https://doi.org/10.1007/s00397-013-0681-y

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  • DOI: https://doi.org/10.1007/s00397-013-0681-y

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