Re-laminarization of elastic turbulence
arXiv:2205.12871 · doi:10.1103/PhysRevFluids.7.L081301
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.
5 figures, Supplemental Material
References in corpus (4)
- Elastic Alfven waves in elastic turbulence
- Elastic wake instabilities in a creeping flow between two obstacles
- Elastically driven Kelvin-Helmholtz-like instability in planar channel flow
- New directions and perspectives in elastic instability and turbulence in various viscoelastic flow geometries without inertia