Dynamic driving eliminates volume fraction inhomogeneity and apparent yield stress in flowing dense non-Brownian suspensions

Christopher Ness, Amgad S. Moussa

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Dense suspensions of non-Brownian hard spheres are often characterised as yield-stress fluids despite having no intrinsic time or force scales that could lead to such rheology. One mechanism for the apparent yield stress is particle migration, which produces (or is caused by) inhomogeneous flow conditions and leads to local regions where the solids content approaches or exceeds the limit of flowability. In such a scenario one does not induce flow by exceeding a yield stress, but instead by exploring the only remaining control parameter, namely the flow history. We demonstrate using particle-based simulation that this apparent local yield stress behaviour does indeed emerge in a model dense suspension of non-Brownian hard spheres and that it can be eliminated by imposing a time-varying flow field.
Original languageEnglish
Article number083338
JournalPhysics of Fluids
Volume36
Early online date22 Aug 2024
Publication statusE-pub ahead of print - 22 Aug 2024

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