Experimental evidence for an intrinsic route to polymer melt fracture phenomena: a nonlinear instability of viscoelastic Poiseuille flow.

@article{Bertola2003ExperimentalEF,
  title={Experimental evidence for an intrinsic route to polymer melt fracture phenomena: a nonlinear instability of viscoelastic Poiseuille flow.},
  author={Volfango Bertola and Bernard Meulenbroek and Christian Wagner and Cornelis Storm and Alexander V. Morozov and Wim van Saarloos and Daniel Bonn},
  journal={Physical review letters},
  year={2003},
  volume={90 11},
  pages={
          114502
        }
}
The production rate of polymer fibers by extrusion is usually limited by the appearance of a series of instabilities ("melt fracture") that lead to unwanted undulations of the surface. We present both qualitative and quantitative experimental evidence that-in addition to previously known polymer-specific scenarios-there is an intrinsic route towards melt fracture type phenomena: a nonlinear ("subcritical") instability of viscoelastic Poiseuille flow. 

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