Entrance and exit effects for a viscoelastic liquid displacing a simple liquid through a contraction.

Abstract : We studied the displacement of the interface between a viscoelastic fluid pushing a simple liquid through a rectangular contraction by following the front interface deformation in time. The progressive deformation of the interface until apparent stabilization is followed, which makes it possible to identify a transient and a stationary regime. For low Weissenberg number the shape of the interface is essentially similar to that between two simple liquids. For sufficiently large Weissenberg number the shape of the interface is different: it is narrower before the entrance and wider just after the exit. The characteristics of this shape are qualitatively analogous to those of the interface between the vortices and the convected regions for the flow of a single viscoelastic fluid through a contraction- expansion. This suggests that the entrance effect is due to extensional effects and the exit effect is due to normal stress effects.
Type de document :
Article dans une revue
Journal of Non-Newtonian Fluid Mechanics, Elsevier, 2013, 199 (September), pp.51-60. 〈10.1016/j.jnnfm.2013.06.005〉
Liste complète des métadonnées

https://hal-ifp.archives-ouvertes.fr/hal-01071704
Contributeur : Françoise Bertrand <>
Soumis le : lundi 6 octobre 2014 - 15:15:34
Dernière modification le : jeudi 11 janvier 2018 - 06:26:21
Document(s) archivé(s) le : jeudi 8 janvier 2015 - 16:31:52

Fichier

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

Identifiants

Citation

J. Avendano, Nicolas Pannacci, Benjamin Herzhaft, Patrick Gateau, Philippe Coussot. Entrance and exit effects for a viscoelastic liquid displacing a simple liquid through a contraction.. Journal of Non-Newtonian Fluid Mechanics, Elsevier, 2013, 199 (September), pp.51-60. 〈10.1016/j.jnnfm.2013.06.005〉. 〈hal-01071704〉

Partager

Métriques

Consultations de la notice

547

Téléchargements de fichiers

147