Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

Slow flows of yield stress fluids: yielding liquids or flowing solids?

Abstract : Yield stress fluids (YSF) exhibit strongly non-linear rheological characteristics. As a consequence they develop original flow features (as compared to simple fluids) under various boundary conditions. This paper reviews and analyze the characteristics of a series of slow flows (just beyond yielding) under more or less complex conditions (simple shear flow, flow through a cavity, dip-coating, blade-coating, Rayleigh-Taylor instability, Saffman-Taylor instability) and highlight some of their common original characteristics: i) a transition from a solid regime to a flowing regime which does not correspond to a true " liquid state " , the flow in this regime may rather be seen as a succession of solid states during very large deformation; ii) a strong tendency to localization of the yielded regions in some small region of the material while the rest of the material undergoes some deformation in its solid state; iii) the deformation of YSF interface with another fluid, in the form of fingers tending to penetrate the material via a local liquefaction process. Finally these observations suggest that for slow flows of YSF are a kind of extension of plastic flows for very large deformations and without irreversible changes of the structure. This suggests that the field of plasticity and the field of slow flows of YSF could benefit from each other.
Type de document :
Article dans une revue
Liste complète des métadonnées

Littérature citée [53 références]  Voir  Masquer  Télécharger
Contributeur : Romain Boistel Connectez-vous pour contacter le contributeur
Soumis le : jeudi 3 mai 2018 - 18:54:57
Dernière modification le : lundi 9 mai 2022 - 10:58:01
Archivage à long terme le : : mardi 25 septembre 2018 - 13:59:21


Article 7.pdf
Fichiers produits par l'(les) auteur(s)




Philippe Coussot. Slow flows of yield stress fluids: yielding liquids or flowing solids?. Rheologica Acta, Springer Verlag, 2018, 57 (1), pp.1 - 14. ⟨10.1007/s00397-017-1055-7⟩. ⟨hal-01784855⟩



Consultations de la notice


Téléchargements de fichiers