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

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

doi:10.48550/arXiv.2207.02720

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

Thomas Larsen, A. L. Søbye, J. R. Royer, W. C. K. Poon, Tom Larsen, S. J. Andreasen, A. D. Drozdov, J. D. C. Christiansen

Publikation: Working paper/Preprint › Preprint

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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, shear thinning becomes more pronounced when shearing from low to high rates than in the opposite direction. We attribute this to a greater degree of filler orientation during up-shear. 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.

Originalsprog	Engelsk
Udgiver	arXiv
Antal sider	9
DOI	https://doi.org/10.48550/arXiv.2207.02720
Status	Udgivet - 6 jul. 2022

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10.48550/arXiv.2207.02720Licens: CC BY 4.0

2207.02720v1Indsendt manuskript, 2,36 MB

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Rheology of polydisperse nonspherical graphite particles suspended in mineral oil
Larsen, T., Søbye, A. L., Royer, J. R., Poon, W., Larsen, T., Andreasen, S. J., Drozdov, A. D. & Christiansen, J. D. C., jan. 2023, I: Journal of Rheology. 67, 1, s. 81-89 9 s., 81.
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › peer review
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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, shear thinning becomes more pronounced when shearing from low to high rates than in the opposite direction. We attribute this to a greater degree of filler orientation during up-shear. 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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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, shear thinning becomes more pronounced when shearing from low to high rates than in the opposite direction. We attribute this to a greater degree of filler orientation during up-shear. 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, shear thinning becomes more pronounced when shearing from low to high rates than in the opposite direction. We attribute this to a greater degree of filler orientation during up-shear. 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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PB - arXiv

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

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Rheology of polydisperse nonspherical graphite particles suspended in mineral oil

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