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Breaking of non-Newtonian character in flows through a porous medium

Abstract : From NMR measurements we show that the velocity field of a yield stress fluid flowing through a disordered well-connected porous medium is very close to that for a Newtonian fluid. In particular, it is shown that no arrested regions exist even at very low velocities, for which the solid regime is expected to be dominant. This suggests that these results obtained for strongly nonlinear fluid can be extrapolated to any nonlinear fluid. We deduce a generalized form of Darcy's law for such materials and provide insight into the physical origin of the coefficients involved in this expression, which are shown to be moments of the second invariant of the strain rate tensor.
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Soumis le : lundi 10 février 2014 - 16:10:14
Dernière modification le : mardi 8 décembre 2020 - 10:21:03
Archivage à long terme le : : dimanche 9 avril 2017 - 10:21:53


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Thibaud Chevalier, Stéphane Rodts, Xavier Chateau, Christophe Chevalier, Philippe Coussot. Breaking of non-Newtonian character in flows through a porous medium. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, American Physical Society, 2014, 89, pp.023002. ⟨10.1103/physRevE.89.023002⟩. ⟨hal-00944452⟩



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