Quantum Turbulence Experiments
Quantum turbulence in superfluid 3He-B
We have also been measuring the properties of quantum turbulence in superfluid 3He-B below 200 μK produced by vibrating wire resonators driven above the pair- breaking critical velocity. We have determined the spatial extent of the vortex tangle and measured the vortex line density produced using novel Andreev scattering techniques. We have also shown that under certain circumstances, vibrating wires can emit single vortex loops.
Quantum turbulence in superfluid 3He-B - Grid turbulence
As Richard Feynman stated, 'Turbulence is the last great unsolved problem of classical physics'. Despite being observed at all length scales from the subnuclear to the cosmological, turbulence is one of the least understood physical phenomena. Our experiments aim to further our understanding of turbulence in general, by addressing the simpler problem of turbulence in pure quantum fluids. Using a vibrating 'grid' we are able to produce thousands of vortex rings (akin to smoke rings) which at higher grid velocities develop into a turbulent tangle.Back Next