A new insight into the dependence of relaxation time on frequency in viscoelastic surfactant solutions: From experimental to modeling study

A new insight into the dependence of relaxation time on frequency in viscoelastic surfactant... Journal of Colloid and Interface Science 517 (2018) 265–277 Contents lists available at ScienceDirect Journal of Colloid and Interface Science journal homepage: www.elsevier.com/locate/jcis Regular Article A new insight into the dependence of relaxation time on frequency in viscoelastic surfactant solutions: From experimental to modeling study Brayan F. García, Soheil Saraji Department of Petroleum Engineering, University of Wyoming, 1000 East University Avenue, Laramie, WY 82071, United States graphical a bstract article i nfo abstract Article history: Hypothesis: The relaxation time in viscoelastic surfactant solutions is a function of temperature, salt/sur- Received 15 November 2017 factant concentrations, resting conditions, as well as shear frequency. The simplistic assumption of a sin- Revised 19 January 2018 gle and constant relaxation time is not representative of all relaxation modes in these solutions especially Accepted 22 January 2018 at high frequencies. Available online 1 February 2018 Experiments: Steady-state and oscillatory measurements are carried out to study the effects of high tem- perature, concentration and resting condition on the rheology of surfactants/salt mixtures including a Keywords: non-ionic and a zwitterionic/anionic surfactant system. Furthermore, a novel semi-empirical rheological Non-Newtonian fluids model is deducted based on Cates theory. This model introduces, for the first time, a frequency- Rheological http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Colloid and Interface Science Elsevier

A new insight into the dependence of relaxation time on frequency in viscoelastic surfactant solutions: From experimental to modeling study

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Publisher
Elsevier
Copyright
Copyright © 2018 Elsevier Inc.
ISSN
0021-9797
eISSN
1095-7103
D.O.I.
10.1016/j.jcis.2018.01.078
Publisher site
See Article on Publisher Site

Abstract

Journal of Colloid and Interface Science 517 (2018) 265–277 Contents lists available at ScienceDirect Journal of Colloid and Interface Science journal homepage: www.elsevier.com/locate/jcis Regular Article A new insight into the dependence of relaxation time on frequency in viscoelastic surfactant solutions: From experimental to modeling study Brayan F. García, Soheil Saraji Department of Petroleum Engineering, University of Wyoming, 1000 East University Avenue, Laramie, WY 82071, United States graphical a bstract article i nfo abstract Article history: Hypothesis: The relaxation time in viscoelastic surfactant solutions is a function of temperature, salt/sur- Received 15 November 2017 factant concentrations, resting conditions, as well as shear frequency. The simplistic assumption of a sin- Revised 19 January 2018 gle and constant relaxation time is not representative of all relaxation modes in these solutions especially Accepted 22 January 2018 at high frequencies. Available online 1 February 2018 Experiments: Steady-state and oscillatory measurements are carried out to study the effects of high tem- perature, concentration and resting condition on the rheology of surfactants/salt mixtures including a Keywords: non-ionic and a zwitterionic/anionic surfactant system. Furthermore, a novel semi-empirical rheological Non-Newtonian fluids model is deducted based on Cates theory. This model introduces, for the first time, a frequency- Rheological

Journal

Journal of Colloid and Interface ScienceElsevier

Published: May 1, 2018

References

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