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The interplay between shear band (SB) formation and boundary conditions (BC)is investigated in wormlike micellar systems (CPyCl--NaSal) using ultrasonicvelocimetry coupled to standard rheology in Couette geometry. Time-resolvedvelocity profiles are recorded during transient strain-controlled experimentsin smooth and sand-blasted geometries. For stick BC standard SB is observed,although depending on the degree of micellar entanglement temporal fluctuationsare reported in the highly sheared band. For slip BC wall slip occurs only forshear rates larger than the start of the stress plateau. At low entanglement,SB formation is shifted by a constant $\Delta\dot{\gamma}$, while for moreentangled systems SB constantly "nucleate and melt." Micellar orientationgradients at the walls may account for these original features.

Competition between shear banding and wall slip in wormlike micelles