Geometric scaling of purely-elastic flow instabilities

Details Geometric scaling of purely-elastic flow instabilities Geometric scaling of purely-elastic flow instabilities

2011-09-23

arxiv.org/abs/1109.5046v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

We present a combined experimental, numerical and theoretical investigation of the geometric scaling of the onset of a purely-elastic flow instability in a serpentine channel. Good qualitative agreement is obtained between experiments, using dilute solutions of flexible polymers in microfluidic devices, and two-dimensional numerical simulations using the UCM model. The results are confirmed by a simple theoretical analysis, based on the dimensionless criterion proposed by Pakdel-McKinley for onset of a purely-elastic instability.

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