Probing shear-banding transitions of the VCM model for entangled wormlike micellar solutions using large amplitude oscillatory shear (LAOS) deformations
Author(s)Zhou, Lin; Cook, L. Pamela; McKinley, Gareth H.
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We explore the use of large amplitude oscillatory shear (LAOS) deformation to probe the dynamics of shear-banding in soft entangled materials, primarily wormlike micellar solutions which are prone to breakage and disentanglement under strong deformations. The state of stress in these complex fluids is described by a class of viscoelastic constitutive models which capture the key linear and nonlinear rheological features of wormlike micellar solutions, including the breakage and reforming of an entangled network. At a frequency-dependent critical strain, the imposed deformation field localizes to form a shear band, with a phase response that depends on the frequency and amplitude of the forcing. The different material responses are compactly represented in the form of Lissajous (phase plane) orbits and a corresponding strain-rate and frequency-dependent Pipkin diagram. Comparisons between the full network model predictions and those of a simpler, limiting case are presented.
DepartmentMassachusetts Institute of Technology. Department of Mechanical Engineering
Journal of Non-Newtonian Fluid Mechanics
Elsevier Science Direct
Zhou, Lin, L.Pamela Cook, and Gareth H. McKinley. “Probing Shear-banding Transitions of the VCM Model for Entangled Wormlike Micellar Solutions Using Large Amplitude Oscillatory Shear (LAOS) Deformations.” Journal of Non-Newtonian Fluid Mechanics 165.21-22 (2010) : 1462-1472. Copyright © 2010, Elsevier
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