• Corpus ID: 243986128

Non-modal elastic instability and elastic waves in weakly perturbed channel flow

@inproceedings{Shnapp2021NonmodalEI,
  title={Non-modal elastic instability and elastic waves in weakly perturbed channel flow},
  author={Ron Shnapp and Victor Steinberg},
  year={2021}
}
In this paper, we present experimental results and reveal that strong perturbations are not necessary for elastic instability to occur in straight-channel, inertialess, visco-elastic flows at high elasticity. We show that a non-normal mode bifurcation is followed by chaotic fluctuations, self-organized as stream-wise streaks, and elastic waves due to weak disturbances generated by a small cavity at the center of the top channel wall. The chaotic flow persists in the transition, elastic… 
Elastic instability in a straight channel of viscoelastic flow without prearranged perturbations
We report experimental results on elastic instability in a viscoelastic channel shear flow due to only a natural non-smoothed inlet and small holes along the channel for pressure measurements. We

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