Collective dynamics and rheology of confined phoretic suspensions

Similarly to their biological counterparts, suspensions of chemically-active autophoretic swimmers exhibit nontrivial dynamics involving self-organization processes as a result inter-particle interactions. Using kinetic model for dilute suspension autochemotactic Janus particles, we analyse the effect confined pressure-driven flow on these collective behaviours and impact chemotactic aggregation effective viscosity active fluid. Four dynamic regimes are identified when increasing strength imposed flow, each associated with different behaviour resulting from competition flow- chemically-induced reorientation together constraints confinement. Interestingly, observe that pusher (resp. puller) hydrodynamic signature, which is known reduce increase) sheared suspension, inverted upon emergence aggregation. Our results provide new insights role in complex environments, relevant synthetic well systems.