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Article Dans Une Revue Physical Review Fluids Année : 2021

Active chaotic mixing in a channel with rotating arc-walls

Résumé

An active inline mixer suitable for flows at low Reynolds number and high Péclet number is studied. An alternated oscillatory forcing protocol is imposed by three rotating circular arc-walls in a straight channel. In the two-dimensional case, simple phenomenological arguments are used to estimate heuristically the mixing efficiency with two non-dimensional control parameters: the Strouhal number based on the bulk flow velocity, and the strength of the cross flow relative to the transport flow. The validity and limitations of the proposed mixing conditions are explained by the transport mechanisms in the mixer. The beneficial role of the elliptic flow regions for stretching and folding the passive scalar interfaces is highlighted, as well as a correlation between good mixing ability and the chaotic advection of tracers in the mixing zone.
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Dates et versions

hal-03156220 , version 1 (03-03-2021)

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Kamal El Omari, Eliane Younes, Teodor Burghelea, Cathy Castelain, Yann Moguen, et al.. Active chaotic mixing in a channel with rotating arc-walls. Physical Review Fluids, 2021, 6 (2), ⟨10.1103/PhysRevFluids.6.024502⟩. ⟨hal-03156220⟩
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