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 of Colloid and Interface Science – Elsevier
Published: May 1, 2018
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