Turbulent Vortex Flow Responses at the AB Interface in Rotating Superfluid 3He-B

Abstract

In a rotating two-phase sample of 3He-B and magnetic-field stabilized 3He-A the large difference in mutual friction dissipation at 0.20 Tc gives rise to unusual vortex flow responses. We use noninvasive NMR techniques to monitor spin down and spin up of the B-phase superfluid component to a sudden change in the rotation velocity. Compared to measurements at low field with no A-phase, where these responses are laminar in cylindrically symmetric flow, spin down with vortices extending across the AB interface is found to be faster, indicating enhanced dissipation from turbulence. Spin up in turn is slower, owing to rapid annihilation of remanent vortices before the rotation increase. As confirmed by both our NMR signal analysis and vortex filament calculations, these observations are explained by the additional force acting on the B-phase vortex ends at the AB interface.

6 pages, 6 figures

References in corpus (8)

• Quantum and quasiclassical types of superfluid turbulence
• Quantum turbulence in propagating superfluid vortex front
• Twisted vortex state
• Super Stability of Laminar Vortex Flow in Superfluid 3He-B
• Vortex Multiplication in Applied Flow: the Precursor to Superfluid Turbulence
• Superfluid vortex front at T -> 0: Decoupling from the reference frame
• Spin down of superfluid-filled vessels: theory versus experiment
• Textures of Superfluid 3He-B in Applied Flow and Comparison with Hydrostatic Theory

Cited by in corpus (7)

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• Dynamics of quantum turbulence of different spectra
• Dissipation enhancement from a single vortex reconnection in superfluid helium
• Mutual friction in superfluid ${}^3$He-B in the low-temperature regime
• Quasiparticle scattering measurements of laminar and turbulent vortex flow in the spin-down of superfluid 3He-B
• Andreev reflection in rotating superfluid ${}^3$He-B
• Thermal Detection of Turbulent and Laminar Dissipation in Vortex Front Motion