Purely-elastic instabilities in cross-channel flows with periodic forcing (INVITED)

Abstract eng:
We present results of a numerical investigation of the low Reynolds number flow of viscoelastic fluids, described by the Oldroyd-B model, in a 2D cross-slot channel with a main inlet flow and two periodic in-phase and out-of-phase forcings imposed on the opposing lateral inlets. Several types of flow transition are reported that depend on the amplitude and frequency of the forcing. We observed that for high Weissenberg numbers the flow becomes chaotic, with the path to the chaotic state depending on both the ratio of steady inlet velocity to oscillating velocity amplitude and Deborah number.

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