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Guer, Yves Le
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document
Un mélangeur actif efficace pour les fluides à seuil de contrainte
Abstract
We present some results of a numerical study of the mixing of a passive scalar by chaotic advection, at low Reynolds number. The mixing is carried out by a new active open flow mixer, called RAW for Rotating Arc-Walls. A phenomenological model is proposed, making it possible to obtain a mixing criterion based on two dimensionless parameters : the Strouhal number based on the bulk velocity of the fluids and the ratio of the transverse velocity to the bulk velocity. For a given protocol corresponding to a choice of these parameters favourable for mixing in the case of a Newtonian fluid, the dependence on the Bingham number of the efficiency of the mixing of a Bingham plastic fluid is investigated. The complex role of the yield stress is evidenced.