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

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

2007-11-09

arxiv.org/abs/0711.1448v1

Physics

Condensed Matter

Other Condensed Matter

4 pages, 4 figures, submitted to APS

Scientific paper

10.1103/PhysRevLett.100.045301

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.

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