Comparison between shear banding and shear thinning in entangled micellar solutions

Rate-Dependent Stiffening and Strain Localization in Physically Associating Solutions

“…36 A maximum in the applied stress with increasing strain rate implies that a homogeneous strain field will be unstable and that the solution will tend to separate into shear bands with regions of high and low strain. 10,40,41 At long times, two different shear rates will coexist at the same value of the shear stress. The value of the steady-state stress (σ ∞ ) was taken as the predicted macroscopic stress at γ = 1000 for each value of Γ.…”

“…10 Tixier et al 11 have seen rheological behavior consistent with a fracture-to-banding transition in networks formed from mixtures of surfactants and telechelic polymers.…”

“…The occurrence of fracture-like behavior in physically associating solutions can be more directly confirmed by direct visualization of the flow fields during deformation or by comparison to simulations. 10,42 Our triblock copolymer solutions are ideally suited for these investigations because of the wide range of relaxation times and gel strengths that can easily be accessed by simple changes in temperature and polymer concentration.…”

A systematic rheological study of alkyl amine surfactants for fluid mobility control in hydrocarbon reservoirs

“…According to , shear banding and shear-thinning behavior are the result of the existence of wormlike micelles due to the dynamics of relaxation, breakage and recombination of the micellar structure as well as the alignment of the chains and disentanglement with respect to the flow gradient (Hu and Lips 2005;. These listed references provide more information about the relation between shear banding and wormlike micelle structures Calabrese et al 2015;Cappelaere and Cressely 1997;Delgado et al 2009;Dhont and Briels 2008;Fardin et al 2015;Helgeson et al 2009;Hu and Lips 2005;Hu et al 2008;Liberatore et al 2009;Manneville 2008;Miller and Rothstein 2007;Pipe et al 2010;Thareja et al 2011;Yesilata et al 2006).…”

“…Nonetheless, a stress plateau can be due to other causes rather than shear banding when interpreting solely shear rate rheological measurements, for instance wall and stick slip, elastic instabilities, geometry, uncertainty from stress measurements, and inherent stress gradient from the device can cause similar responses (Hu et al 2008). According to Manneville (2008), a plateau in shear stress provides insufficient evidence of the shear banding presence since the Couette geometry only measures global measurements and shear banding requires more localized characterization tools to allow the organization and microstructure of the bands (Manneville 2008).…”