Vorticity alignment and negative normal stresses in sheared attractive emulsions.

@article{Montesi2004VorticityAA,
  title={Vorticity alignment and negative normal stresses in sheared attractive emulsions.},
  author={Alberto Montesi and Alejandro A. Pe{\~n}a and Matteo Pasquali},
  journal={Physical review letters},
  year={2004},
  volume={92 5},
  pages={
          058303
        }
}
Attractive emulsions near the colloidal glass transition are investigated by rheometry and optical microscopy under shear. We find that (i) the apparent viscosity eta drops with increasing shear rate, then remains approximately constant in a range of shear rates, then continues to decay; (ii) the first normal stress difference N1 transitions sharply from nearly zero to negative in the region of constant shear viscosity; and (iii) correspondingly, cylindrical flocs form, align along the… CONTINUE READING

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