On the shear banding flow of elongated micellar solutions

被引:82
作者
Bautista, F
Soltero, JFA
Pérez-López, JH
Puig, JE
Manero, O
机构
[1] Univ Guadalajara, CUCEI, Dept Ingn Quim, Guadalajara 44430, Jalisco, Mexico
[2] Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
关键词
micellar solutions; steady shear flow; codeformational Maxwell constitutive equation;
D O I
10.1016/S0377-0257(00)00128-2
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
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 sheer 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.
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页码:57 / 66
页数:10
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