Mechanistic constitutive model for wormlike micelle solutions with flow-induced structure formation

摘要

Highlights?A constitutive model for predicting flow-induced structures is proposed.?The model predicts an increase in both shear and extensional viscosity.?Stress becomes multivalued for certain values of strain rate.?Predictions for shear and extensional flow agree reasonably with experiments.?This model can be used as a constitutive relation for CFD studies.AbstractWe present a tensor constitutive model for predicting stress and flow-induced structure formation in dilute wormlike micellar solutions. The micellar solution is treated as a dilute suspension of rigid Brownian rods whose length varies dynamically. Consistent with the mechanism presented by Turner and Cates [J. Phys.:?Condens. Matter 4, 3719 (1992)], flow-induced alignment of the rods is