Entrance and exit effects for a viscoelastic liquid displacing a simple liquid through a contraction. - Archive ouverte HAL Access content directly
Journal Articles Journal of Non-Newtonian Fluid Mechanics Year : 2013

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

(1, 2) , (1) , (1) , (1) , (3)
1
2
3

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.
Fichier principal
Vignette du fichier
Pannacci.pdf (1.45 Mo) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

hal-01071704 , version 1 (06-10-2014)

Identifiers

Cite

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, 2013, 199 (September), pp.51-60. ⟨10.1016/j.jnnfm.2013.06.005⟩. ⟨hal-01071704⟩
328 View
194 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More