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Viscoelastic liquid curtains: experimental results on the flow of a falling sheet of polymer solution

Published online by Cambridge University Press:  24 June 2019

A. Gaillard Open the ORCID record for A. Gaillard [Opens in a new window] ,
M. Roché Open the ORCID record for M. Roché [Opens in a new window] ,
S. Lerouge ,
C. Gay ,
L. Lebon  and
L. Limat
A. Gaillard*
Affiliation:
Laboratoire Matière et Systemes Complexes, CNRS UMR 7057 Université Denis Diderot, 10 rue Alice Domon et Léonie Duquet, 75013 Paris, France
M. Roché
Affiliation:
Laboratoire Matière et Systemes Complexes, CNRS UMR 7057 Université Denis Diderot, 10 rue Alice Domon et Léonie Duquet, 75013 Paris, France
S. Lerouge
Affiliation:
Laboratoire Matière et Systemes Complexes, CNRS UMR 7057 Université Denis Diderot, 10 rue Alice Domon et Léonie Duquet, 75013 Paris, France
C. Gay
Affiliation:
Laboratoire Matière et Systemes Complexes, CNRS UMR 7057 Université Denis Diderot, 10 rue Alice Domon et Léonie Duquet, 75013 Paris, France
L. Lebon
Affiliation:
Laboratoire Matière et Systemes Complexes, CNRS UMR 7057 Université Denis Diderot, 10 rue Alice Domon et Léonie Duquet, 75013 Paris, France
L. Limat
Affiliation:
Laboratoire Matière et Systemes Complexes, CNRS UMR 7057 Université Denis Diderot, 10 rue Alice Domon et Léonie Duquet, 75013 Paris, France
*
†Email address for correspondence: antoine0gaillard@gmail.com
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Abstract

We experimentally investigate the extensional flow of a sheet – or curtain – of viscoelastic liquid falling freely from a slot at constant flow rate under gravity. Extruded liquids are aqueous solutions of flexible polyethylene oxide (PEO) and of semi-rigid partially hydrolysed polyacrylamide (HPAM) with low shear viscosities. Velocimetry measurements reveal that the mean velocity field $U(z)$ (where $z$ is the distance from the slot exit) does not reduce to a free fall. More precisely, we show that the liquid falls initially with sub-gravitational accelerations up to a distance from the slot which scales as $g\unicode[STIX]{x1D70F}_{fil}^{2}$ (where $g$ is gravity and $\unicode[STIX]{x1D70F}_{fil}$ is the extensional relaxation time of the liquid) due to the stretching of polymer molecules. Beyond this elastic length, inertia dominates and the local acceleration reaches the asymptotic free-fall value $g$. The length of the sub-gravitational part of the curtain is shown to be much larger than the equivalent viscous length $((4\unicode[STIX]{x1D702}/\unicode[STIX]{x1D70C})^{2}/g)^{1/3}$ for Newtonian liquids of density $\unicode[STIX]{x1D70C}$ and dynamic viscosity $\unicode[STIX]{x1D702}$ which is usually small compared to the curtain length. By analogy with Newtonian curtains, we show that the velocity field $U(z)$ rescales on a master curve. Besides, the flow is shown to be only weakly affected by the history of polymer deformations in the die upstream of the curtain. Furthermore, investigations on the curtain stability reveal that polymer addition reduces the minimum flow rate required to maintain a continuous sheet of liquid.

JFM classification

Non-Newtonian Flows: Polymers Interfacial Flows (free surface): Thin films Non-Newtonian Flows: Viscoelasticity
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 873 , 25 August 2019 , pp. 358 - 409
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© 2019 Cambridge University Press 

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