Spheres in the vicinity of a bifurcation: elucidating the Zweifach-Fung effect - Archive ouverte HAL
Article Dans Une Revue Journal of Fluid Mechanics Année : 2011

Spheres in the vicinity of a bifurcation: elucidating the Zweifach-Fung effect

Résumé

The problem of the splitting of a suspension in bifurcating channels divided into two branches of non-equal flow rates is addressed. As has long been observed, in particular in blood flow studies, the volume fraction of particles generally increases in the high-flow-rate branch and decreases in the low-flow-rate branch. In the literature, this phenomenon is sometimes interpreted as the result of some attraction of the particles towards this high-flow-rate branch. In this paper, we focus on the existence of such an attraction through microfluidic experiments and two-dimensional simulations and show clearly that such an attraction does not occur but is, on the contrary, directed towards the low-flow-rate branch. Arguments for this attraction are given and a discussion on the sometimes misleading arguments found in the literature is given. Finally, the enrichment of particles in the high-flow-rate branch is shown to be mainly a consequence of the initial distribution in the inlet branch, which shows necessarily some depletion near the walls.

Dates et versions

hal-00665656 , version 1 (02-02-2012)

Identifiants

Citer

Vincent Doyeux, Thomas Podgorski, Sarah Peponas, Mourad Ismail, Gwennou Coupier. Spheres in the vicinity of a bifurcation: elucidating the Zweifach-Fung effect. Journal of Fluid Mechanics, 2011, 674, pp.359-388. ⟨10.1017/S0022112010006567⟩. ⟨hal-00665656⟩
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