Elastic Instabilities of Polymer Solutions in Cross-Channel Flow

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Engineering
Mechanical Engineering
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Thomas, C. C.
Diorio, J.
Gollub, J. P.
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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 be used to produce mixing.

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2006-04-14
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Suggested Citation: P. Arratia, C. Thomas, J. Diorio, and J. Gollub, (2006) Elastic Instabilities of Polymer Solutions in Cross-Channel Flow . Physical Review Letters. Vol 96(14). Copyright 2006 American Physical Society. Publisher URL: http://link.aps.org/doi/10.1103/PhysRevLett.96.144502
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