Turbulence in Boundary Flow of Superfluid ${}^4$He Triggered by Free Vortex Rings

Abstract

The transition to turbulence in the boundary flow of superfluid ${}^4$He is investigated using a vortex--free vibrating wire. At high wire vibration velocities, we found that stable alternating flow around the wire enters a turbulent phase triggered by free vortex rings. Numerical simulations of vortex dynamics demonstrate that vortex rings can attach to the surface of an oscillating obstacle and expand unstably due to the boundary flow of the superfluid, forming turbulence. Experimental investigations indicate that the turbulent phase continues even after stopping the injection of vortex rings, which is also confirmed by the simulations.

arXiv comment4 pages, 4 figures, submitted to APS

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• Kelvin-Tkachenko waves of few-vortex arrays in trapped Bose-Einstein condensates
• Operating Nanobeams in a Quantum Fluid
• Damping of a micro-electromechanical oscillator in turbulent superfluid ${}^4$He: A novel probe of quantized vorticity in the ultra-low temperature regime
• Statistical laws and self-similarity of vortex rings emitted from a localized vortex tangle in superfluid ${}^4$He
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• The onset of nanoscale dissipation in superfluid He-4 at zero temperature: the role of vortex shedding and cavitation
• On the Transition to Turbulence of Oscillatory Flow of Liquid Helium-4
• Statistics of vortex loops emitted from quantum turbulence driven by an oscillating sphere
• On the Transition from Potential Flow to Turbulence Around a Microsphere Oscillating in Superfluid ^4He
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• Can we swim in superfluids?: Numerical demonstration of self-propulsion in a Bose-Einstein condensate