title: Deterministic particle transport in a ratchet flow.
abstract: This study is motivated by the issue of the pumping of particle through a periodic modulated channel. We focus on a simplified deterministic model of small inertia particles within the Stokes flow framework that we call "ratchet flow." A path-following method is employed in the parameter space in order to retrace the scenario which from bounded periodic solutions leads to particle transport. Depending on whether the magnitude of the particle drag is moderate or large, two main transport mechanisms are identified in which the role of the parity symmetry of the flow differs. For large drag, transport is induced by flow asymmetry, while for moderate drag, since the full transport solution bifurcation structure already exists for symmetric settings, flow asymmetry only makes the transport effective. We analyzed the scenarios of current reversals for each mechanism as well as the role of synchronization. In particular we show that, for large drag, the particle drift is similar to phase slip in a synchronization problem.
authors: Université d'Avignon et des Pays de Vaucluse-INRA, UMR1114 EMMAH, F-84914 Avignon, France.
authors: Philippe
authors: P
authors: Beltrame
authors: Université d'Avignon et des Pays de Vaucluse-INRA, UMR1114 EMMAH, F-84914 Avignon, France.
authors: Mounia
authors: M
authors: Makhoul
authors: Université d'Avignon et des Pays de Vaucluse-INRA, UMR1114 EMMAH, F-84914 Avignon, France.
authors: Maminirina
authors: M
authors: Joelson
mesh_terms: D017276:Friction; D008962:Models, Theoretical; D009038:Motion; D010507:Periodicity; D011312:Pressure; D013314:Stress, Mechanical; D014783:Viscosity