Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session X14: Biofluids: Suspension/Sedimentation
8:00 AM–9:57 AM,
Tuesday, November 21, 2023
Room: 144AB
Chair: Zhouyang Ge, University of British Columbia
Abstract: X14.00006 : Self-organisation and rheology of phoretic suspensions in confined pressure-driven flows*
9:05 AM–9:18 AM
Presenter:
Sebastien Michelin
(Ecole Polytechnique)
Authors:
Tullio Traverso
(The Alan Turing Institute, Imperial College London)
Sebastien Michelin
(Ecole Polytechnique)
An external flow, as well as the presence of confining wall, modifies these spontaneous dynamics. We numerically solve a kinetic model to study the self-organisation of dilute phoretic suspensions in pressure-driven flows within a thin confined layer. For a fixed confinement, four regimes are identified depending on the flow strength, ranging from stationary streamwise uniform distribution of particles to the highly dynamic evolution of two-dimensional patterns. These observed collective dynamics are physically explained with the aid of a reduced model of the suspension.
Active particles also exert mechanical stresses on the surrounding flow. Their collective organisation therefore modifies the stress-strain relationship within the suspension, providing a first insight on the active rheological opportunities of such phoretic suspensions.
*European Research Council (ERC), Grant Agreement 714027
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