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Linking particle properties to dense suspension extrusion flow characteristics using discrete element simulations

Research output: Contribution to journalArticle

  • Christopher Ness
  • Jin Ooi
  • Jin Sun
  • Michele Marigo
  • Paul McGuire
  • Han Xu
  • Hugh Stitt

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Original languageEnglish
Pages (from-to)3069–3082
JournalAIChE Journal
Issue number7
Publication statusPublished - 5 May 2017


Extrusion is a widely used process for forming suspensions and pastes into designed shapes, and is central to the manufacture of many products. In this article, the extrusion through a square-entry die of non-Brownian spheres suspended in Newtonian fluid is investigated using discrete element simulations, capturing individual particle-particle contacts and hydrodynamic interactions. The simulations reveal inhomogeneous velocity and stress distributions, originating in the inherent microstructure formed by the constituent particles. Such features are shown to be relevant to generic paste extrusion behavior, such as extrudate swell. The pressure drop across the extruder is correlated with the extrudate flow rate, with the empirical fitting parameters being linked directly to particle properties such as surface friction, and processing conditions such as extruder wall roughness. Our model and results bring recent advances in suspension rheology into an industrial setting, laying foundations for future model development, predictive paste formulation and extrusion design.

    Research areas

  • Extrusion, DENSE SUSPENSIONS, Discrete Element Method, paste flow

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