Velocity profiles in shear-banding wormlike micelles.

  title={Velocity profiles in shear-banding wormlike micelles.},
  author={Jean-Baptiste Salmon and Annie Colin and S{\'e}bastien Manneville and F. Molino},
  journal={Physical review letters},
  volume={90 22},
Using dynamic light scattering in heterodyne mode, we measure velocity profiles in a much studied system of wormlike micelles (CPCl/NaSal) known to exhibit both shear-banding and stress plateau behavior. Our data provide evidence for the simplest shear-banding scenario, according to which the effective viscosity drop in the system is due to the nucleation and growth of a highly sheared band in the gap, whose thickness linearly increases with the imposed shear rate. We discuss various details of… CONTINUE READING