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

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

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 languageEnglish
Pages (from-to)81-89
Number of pages9
JournalJournal of rheology
Issue number1
Publication statusPublished - 8 Nov 2022

Keywords / Materials (for Non-textual outputs)

  • cond-mat.soft


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