Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.12104/43346
Title: On the shear banding flow of elongated micellar solutions
Author: Bautista, F.
Soltero, J.F.A.
Perez-Lopez, J.H.
Puig, J.E.
Manero, O.
Issue Date: 2000
Abstract: Under steady shear flow, elongated micellar solutions show shear stress saturation above a critical shear rate due to the formation of shear bands that result in non-homogeneous flow. Long transients and oscillations accompany this stress plateau. When measurements are done with a controlled stress rheometer, frequently a metastable branch is observed. At higher shear rates, a second upturn is observed above a second critical shear rate, which indicates that homogeneous flow is recovered. Here, a model consisting of the codeformational Maxwell constitutive equation coupled to a kinetic equation to account for the breaking and reformation of the micelles is presented to reproduce the features described above in steady shear flow. The model also predicts a second metastable branch and long transients at higher shear rates and the existence of an inflexion point in stress-shear rate plots above which no shear banding behavior is detected. (C) 2000 Elsevier Science B.V. All rights reserved.Under steady shear flow, elongated micellar solutions show shear stress saturation above a critical shear rate due to the formation of shear bands that result in non-homogeneous flow. Long transients and oscillations accompany this stress plateau. When measurements are done with a controlled stress rheometer, frequently a metastable branch is observed. At higher shear rates, a second upturn is observed above a second critical shear rate, which indicates that homogeneous flow is recovered. Here, a model consisting of the codeformational Maxwell constitutive equation coupled to a kinetic equation to account for the breaking and reformation of the micelles is presented to reproduce the features described above in steady shear flow. The model also predicts a second metastable branch and long transients at higher shear rates and the existence of an inflexion point in stress-shear rate plots above which no shear banding behavior is detected.
URI: http://www.scopus.com/inward/record.url?eid=2-s2.0-0034333503&partnerID=40&md5=74fcd5e77bc8e3a5f8ed28b3b29c98ca
http://hdl.handle.net/20.500.12104/43346
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