Rheology of Polydisperse non-Spherical Graphite Particles Suspended in Mineral Oil

Th Larsen; A. L. Søbye; J. R. Royer; W. C. K. Poon; T. Larsen; S. J. Andreasen; A. D. Drozdov; J. D. C. Christiansen

doi:10.1122/8.0000511

Rheology of Polydisperse non-Spherical Graphite Particles Suspended in Mineral Oil

Th Larsen
, A. L. Søbye
, J. R. Royer
, W. C. K. Poon
, T. Larsen
, S. J. Andreasen
, A. D. Drozdov
, J. D. C. Christiansen^*

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

We study the role of filler concentration and microphysics on the rheology of polydisperse flake-graphite particles suspended in Newtonian mineral oil. Under steady shear, our samples exhibit shear thinning and yielding behaviour is observed for volume fractions φ > 0.18. Time-temperature superposition was observed using an Arrhenius-type horizontal shift factor, giving a flow activation energy that is dependent on the graphite volume fraction, suggesting concentration-dependent contributions to relaxation processes in the
suspensions. The flow curves are fitted by a constraint-based model, indicating that the flow behaviour is controlled by frictional and adhesive contacts, with the model suggesting that the adhesive stress is temperature dependent.

Original language	English
Pages (from-to)	81-89
Number of pages	9
Journal	Journal of rheology
Volume	67
Issue number	1
DOIs	https://doi.org/10.1122/8.0000511
Publication status	Published - 8 Nov 2022

Keywords / Materials (for Non-textual outputs)

cond-mat.soft

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10.1122/8.0000511

2207.02720v2Accepted author manuscript, 2.28 MBLicence: Creative Commons: Attribution (CC-BY)

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abstract = "We study the role of filler concentration and microphysics on the rheology of polydisperse flake-graphite particles suspended in Newtonian mineral oil. Under steady shear, our samples exhibit shear thinning and yielding behaviour is observed for volume fractions φ > 0.18. Time-temperature superposition was observed using an Arrhenius-type horizontal shift factor, giving a flow activation energy that is dependent on the graphite volume fraction, suggesting concentration-dependent contributions to relaxation processes in the suspensions. The flow curves are fitted by a constraint-based model, indicating that the flow behaviour is controlled by frictional and adhesive contacts, with the model suggesting that the adhesive stress is temperature dependent. ",

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AU - Larsen, Th

AU - Søbye, A. L.

AU - Royer, J. R.

AU - Poon, W. C. K.

AU - Larsen, T.

AU - Andreasen, S. J.

AU - Drozdov, A. D.

AU - Christiansen, J. D. C.

PY - 2022/11/8

Y1 - 2022/11/8

N2 - We study the role of filler concentration and microphysics on the rheology of polydisperse flake-graphite particles suspended in Newtonian mineral oil. Under steady shear, our samples exhibit shear thinning and yielding behaviour is observed for volume fractions φ > 0.18. Time-temperature superposition was observed using an Arrhenius-type horizontal shift factor, giving a flow activation energy that is dependent on the graphite volume fraction, suggesting concentration-dependent contributions to relaxation processes in the suspensions. The flow curves are fitted by a constraint-based model, indicating that the flow behaviour is controlled by frictional and adhesive contacts, with the model suggesting that the adhesive stress is temperature dependent.

AB - We study the role of filler concentration and microphysics on the rheology of polydisperse flake-graphite particles suspended in Newtonian mineral oil. Under steady shear, our samples exhibit shear thinning and yielding behaviour is observed for volume fractions φ > 0.18. Time-temperature superposition was observed using an Arrhenius-type horizontal shift factor, giving a flow activation energy that is dependent on the graphite volume fraction, suggesting concentration-dependent contributions to relaxation processes in the suspensions. The flow curves are fitted by a constraint-based model, indicating that the flow behaviour is controlled by frictional and adhesive contacts, with the model suggesting that the adhesive stress is temperature dependent.

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U2 - 10.1122/8.0000511

DO - 10.1122/8.0000511

M3 - Article

SN - 0148-6055

VL - 67

SP - 81

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JO - Journal of rheology

JF - Journal of rheology

IS - 1

ER -

Rheology of Polydisperse non-Spherical Graphite Particles Suspended in Mineral Oil

Abstract

Keywords / Materials (for Non-textual outputs)

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