Volume 64, Number 6, December 2003
|Page(s)||823 - 829|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 November 2003|
Turbulent-drag reduction of polyelectrolyte solutions: Relation with the elongational viscosity
Laboratoire de Physique Statistique, UMR CNRS 8550, Ecole
Normale Supérieure 24 rue Lhomond, 75231 Paris Cedex 05, France
2 Centre de Physique Moléculaire Optique et Hertzienne, Université Bordeaux 1 (UMR 5798) - 351 Cours de la Liberation, 33405 Talence, France
3 Department of Chemical Engineering, Massachusetts Institute of Technology Cambridge, MA 02139, USA
Corresponding author: email@example.com
Accepted: 6 October 2003
We report measurements of turbulent-drag reduction of two different polyelectrolyte solutions: DNA and hydrolyzed polyacrylamide. Changing the salt concentration in the solutions allows us to change the flexibility of the polymer chains. For both polymers the amount of drag reduction was found to increase with the flexibility. Rheological studies reveal that the elongational viscosity of the solutions increases simultaneously. Hence we conclude that the elongational viscosity is the pertinent macroscopic quantity to describe the ability of a polymer to cause turbulent-drag reduction.
PACS: 83.60.Yz – Drag reduction / 83.50.Jf – Extensional flow and combined shear and extension / 82.35.Rs – Polyelectrolytes
© EDP Sciences, 2003
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