The rheology of slurries of athermal cohesive micro-particles immersed in fluid: A computational and experimental comparison

Eric Murphy, Gilson Lomboy, Kejin Wang, Sriram Sundararajan, Shankar Subramaniam

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Immersed cohesive particles that aggregate under shear are commonly encountered in chemical engineering contexts. This work concerns the rheology of a particular set of systems, cement pastes, that have been difficult to treat from first-principles. In practice, these pastes exhibit large polydispersity with micron to millimeter sized particles, complicated particle shapes, and non-trivial surface morphology and surface chemistry. Simulations presented here utilize the discrete element model, informed by microscale atomic force microscopy measurements of surface topography, surface energy, and friction, and a simplified version of Stokesian Dynamics. Using these simulations, we study simple shear of two cementitious slurries composed of Portland cement and fly ash particles. These computations are then compared with steady-state vane rheometer experiments. This first-principles approach to comparing simulation and experiment allows us to explore how the microscale and macroscale physics are linked. Both computations and experiments agree qualitatively and are well modeled as Bingham plastics. Computations also show the emergence of percolating clusters, responsible for the rheology. Finally, including the mechanisms that are responsible for frustrated particle motions, such as effects of friction and rough walls at experimental scales, are shown to help give quantitatively better comparisons between simulation and experiment.

Original languageEnglish (US)
Pages (from-to)411-420
Number of pages10
JournalChemical Engineering Science
Volume193
DOIs
StatePublished - Jan 16 2019

Fingerprint

Slurries
Rheology
Fluids
Ointments
Experiments
Friction
Coal Ash
Rheometers
Polydispersity
Surface topography
Chemical engineering
Portland cement
Surface chemistry
Fly ash
Interfacial energy
Surface morphology
Atomic force microscopy
Cements
Physics
Plastics

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Cite this

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The rheology of slurries of athermal cohesive micro-particles immersed in fluid : A computational and experimental comparison. / Murphy, Eric; Lomboy, Gilson; Wang, Kejin; Sundararajan, Sriram; Subramaniam, Shankar.

In: Chemical Engineering Science, Vol. 193, 16.01.2019, p. 411-420.

Research output: Contribution to journalArticle

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