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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.
Littérature citée [13 références]
https://hal-enpc.archives-ouvertes.fr/hal-00944452
Contributeur : Xavier Chateau <>
Soumis le : lundi 10 février 2014 - 16:10:14
Dernière modification le : vendredi 17 juillet 2020 - 17:09:09
Archivage à long terme le : : dimanche 9 avril 2017 - 10:21:53
Contributeur : Xavier Chateau <>
Soumis le : lundi 10 février 2014 - 16:10:14
Dernière modification le : vendredi 17 juillet 2020 - 17:09:09
Archivage à long terme le : : dimanche 9 avril 2017 - 10:21:53
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