Elastic instabilities of polymer solutions in cross-channel flow.

  title={Elastic instabilities of polymer solutions in cross-channel flow.},
  author={Paulo E. Arratia and Charles C Thomas and James D. Diorio and Jerry P. Gollub},
  journal={Physical review letters},
  volume={96 14},
When polymer molecules pass near the hyperbolic point of a microchannel cross flow, they are strongly stretched. As the strain rate is varied at low Reynolds number (< 10(-2)), tracer and particle-tracking experiments show that molecular stretching produces two flow instabilities: one in which the velocity field becomes strongly asymmetric, and a second in which it fluctuates nonperiodically in time. The flow is strongly perturbed even far from the region of instability, and this phenomenon can… CONTINUE READING
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