Issue
EPL
Volume 86, Number 3, May 2009
Article Number 34002
Number of page(s) 5
Section Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics
DOI http://dx.doi.org/10.1209/0295-5075/86/34002
Published online 18 May 2009
EPL, 86 (2009) 34002
DOI: 10.1209/0295-5075/86/34002

Polymer conformations and hysteretic stresses in nonstationary flows of polymer solutions

N. François, Y. Amarouchene, B. Lounis and H. Kellay

Université Bordeaux 1, Centre de Physique Moléculaire Optique et Hertzienne (UMR 5798 du CNRS) 351 cours de la Libération, 33405 Talence, France, EU


received 10 February 2009; accepted in final form 16 April 2009; published May 2009
published online 18 May 2009

Abstract
The low Reynolds number flow of a polymer solution around a cylinder engenders a nonlinear drag force vs. the flow velocity. A velocity quench of such a flow gives rise to a long time relaxation and hysteresis of the stress due to history-dependent elastic effects. Our results suggest that such hysteretic behavior has its origin in the long time relaxation dynamics and hysteresis of the polymer conformations.

PACS
47.57.Ng - Polymers and polymer solutions.
47.57.Qk - Rheological aspects.
47.61.-k - Micro- and nano-scale flow phenomena.

© EPLA 2009