Re-laminarization of elastic turbulence
Abstract
We report frictional drag reduction and a complete flow re-laminarization of elastic turbulence (ET) at vanishing inertia in a viscoelastic channel flow past an obstacle. We show that intensity of observed elastic waves and wall-normal vorticity correlate well with the measured drag above the ET onset. Moreover, we find that the elastic wave frequency grows with Weissenberg number, and at sufficiently high frequency it causes decay of the elastic waves, resulting in ET attenuation and drag reduction. Thus, this allows us to substantiate a physical mechanism, involving interaction of elastic waves with wall-normal vorticity fluctuations, leading to the drag reduction and re-laminarization phenomena at low Reynolds number.
- Publication:
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arXiv e-prints
- Pub Date:
- May 2022
- DOI:
- 10.48550/arXiv.2205.12871
- arXiv:
- arXiv:2205.12871
- Bibcode:
- 2022arXiv220512871V
- Keywords:
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- Physics - Fluid Dynamics;
- Condensed Matter - Soft Condensed Matter;
- Nonlinear Sciences - Chaotic Dynamics;
- Physics - Applied Physics
- E-Print:
- 5 figures, Supplemental Material