Observation of bistable turbulence in quasi-two-dimensional superflow
arXiv:2003.01079 · doi:10.1103/PhysRevLett.125.025301
Abstract
Turbulent flow restricted to two dimensions can spontaneously develop order on large scales, defying entropy expectations and in sharp contrast with turbulence in three dimensions where nonlinear turbulent processes act to destroy large-scale order. In this work we report the observation of unusual turbulent behavior in steady-state flow of superfluid \4He---a liquid with vanishing viscosity and discrete vorticity---in a nearly two-dimensional channel. Surprisingly, for a range of experimental parameters, turbulence is observed to exist in two bistable states. This bistability can be well explained by the appearance of large-scale regions of flow of opposite vorticity.
arXiv comment5 pages, 4 figures. Version 2: Added Supplementary Information (7 pages, 6 figures). Version 3: Changes from the review process, added figure in SI
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- Surface-dominated finite size effects in nanoconfined superfluid helium
- Dynamical mechanisms of vortex pinning in superfluid thin films
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