Rheology of polydisperse nonspherical graphite particles suspended in mineral oil

Thomas Larsen; A. L. Søbye; J. R. Royer; Wilson Poon; T. Larsen; S. J. Andreasen; A. D. Drozdov; Jesper De C. Christiansen

doi:10.1122/8.0000511

Rheology of polydisperse nonspherical graphite particles suspended in mineral oil

Thomas Larsen^*, A. L. Søbye, J. R. Royer, Wilson Poon, T. Larsen, S. J. Andreasen, A. D. Drozdov, Jesper De C. Christiansen^*

^*Corresponding author for this work

Research output: Contribution to journal › Journal article › Research › peer-review

5 Citations (Scopus)

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 behavior is observed for volume fractions [Formula: see text]. 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 behavior is controlled by frictional and adhesive contacts, with the model suggesting that the adhesive stress is temperature dependent.

Original language	English
Article number	81
Journal	Journal of Rheology
Volume	67
Issue number	1
Pages (from-to)	81-89
Number of pages	9
ISSN	0148-6055
DOIs	https://doi.org/10.1122/8.0000511
Publication status	Published - Jan 2023

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title = "Rheology of polydisperse nonspherical graphite particles suspended in mineral oil",

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 behavior is observed for volume fractions [Formula: see text]. 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 behavior is controlled by frictional and adhesive contacts, with the model suggesting that the adhesive stress is temperature dependent.",

author = "Thomas Larsen and S{\o}bye, {A. L.} and Royer, {J. R.} and Wilson Poon and T. Larsen and Andreasen, {S. J.} and Drozdov, {A. D.} and Christiansen, {Jesper De C.}",

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T1 - Rheology of polydisperse nonspherical graphite particles suspended in mineral oil

AU - Larsen, Thomas

AU - Søbye, A. L.

AU - Royer, J. R.

AU - Poon, Wilson

AU - Larsen, T.

AU - Andreasen, S. J.

AU - Drozdov, A. D.

AU - Christiansen, Jesper De C.

PY - 2023/1

Y1 - 2023/1

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 behavior is observed for volume fractions [Formula: see text]. 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 behavior 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 behavior is observed for volume fractions [Formula: see text]. 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 behavior 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 - Journal article

SN - 0148-6055

VL - 67

SP - 81

EP - 89

JO - Journal of Rheology

JF - Journal of Rheology

IS - 1

M1 - 81

ER -

Rheology of polydisperse nonspherical graphite particles suspended in mineral oil

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

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