Abstract
The motion of quantized vortices is studied using a vibrating wire in superfluid 4He. A vortex filtering method provides a superfluid practically free of remanent vortices in which the vibration of a wire cannot generate turbulence. Vortex lines are produced by cooling through the superfluid transition and remain forming bridges between a wire and a surrounding wall. Bridged remanent vortices increase the resonance frequency of a vibrating wire: the rate of an increase due to the remanent vortices is constant in a laminar flow regime and steeply increases in a turbulent flow regime with increasing wire velocity. These results suggest that oscillation of the bridged vortices provides a linear contribution to the wire vibration in the laminar flow regime, until instability occurs in the oscillation of the vortices, causing turbulence.
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Yano, H., Hashimoto, N., Goto, R. et al. Instability of Quantized Vortices Attached to Oscillating Boundaries in Superfluid 4He. J Low Temp Phys 150, 410–414 (2008). https://doi.org/10.1007/s10909-007-9561-0
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DOI: https://doi.org/10.1007/s10909-007-9561-0