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A bootstrap mechanism for non-colloidal suspension viscosity

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Abstract

The role of friction in non-colloidal suspensions is examined with a model which splits the viscosity into a frictionless component (τ*) plus a frictional component which depends on the ratio of the particle pressure (P) to the shear stress (τ). The model needs the input by computation of τ* and P and a suitable choice of particle friction coefficient (μ). It can be extended to elongational flows and cases where sphere roughness is important; volume fractions up to 0.5 are considered. It is shown that friction acts in a feedback or “bootstrap” manner to increase the suspension viscosity. The analysis is also useful for deducing the friction coefficient in suspensions from experimental data. It was applied to several sets of experimental data and reasonable correlations of the viscosities were demonstrated. An example of the correlation for spheres in a silicone oil is shown for volume fractions 0.1–0.5.

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Acknowledgements

We thank the University of Sydney for providing scholarship support for Arif Mahmud. JiYoung Moon acknowledges that his research was supported by the Basic Science Research Program of the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2017R1A6A3A03003276). C.N. acknowledges financial support from the Maudslay-Butler Research Fellowship at Pembroke College, Cambridge.

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Authors and Affiliations

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

    Roger I. Tanner, Arif Mahmud, Shaocong Dai & Jiyoung Moon

  2. Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, CB3 0AS, UK

    Christopher Ness

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  1. Roger I. Tanner
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  2. Christopher Ness
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  3. Arif Mahmud
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  4. Shaocong Dai
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  5. Jiyoung Moon
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Correspondence to Roger I. Tanner.

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Tanner, R.I., Ness, C., Mahmud, A. et al. A bootstrap mechanism for non-colloidal suspension viscosity. Rheol Acta 57, 635–643 (2018). https://doi.org/10.1007/s00397-018-1103-y

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  • DOI: https://doi.org/10.1007/s00397-018-1103-y

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