The Use of Vibrating Structures in the Study of Quantum Turbulence

摘要: Abstract Vibrating structures such as discs, spheres, grids and wires have been widely used in research on quantum fluids are playing a valuable role the investigation of turbulence. Quantum turbulence, form turbulence observed superfluids, differs from that classical for three reasons: except at lowest temperatures, superfluids exhibit two-fluid behaviour; superfluid component can flow without dissipation; superflow is subject to severe restrictions, so rotational motion exist only through presence quantised vortex lines. In spite these differences, there evidence features similar those its counterpart, especially large length scales. Therefore, we first describe try understand how simplest laminar breaks down around various oscillating fluid, leading high enough Reynolds number fully turbulent flow. Then address analogous questions cases our study combines challenges met with associated phenomena condensed matter systems. We emphasise that, undoubted similarities between cases, must be an important difference relating initial transition flow: case, this viscous type no slip solid boundary, whereas case irrotational complete slip. discuss take place two steps: occurs leads generation random tangle lines; second involves large-scale both and, if appropriate, normal mimicking behaviour fluid.