Dissipation of Quantum Turbulence in the Zero Temperature Limit

Details Dissipation of Quantum Turbulence in the Zero Temperature Limit Dissipation of Quantum Turbulence in the Zero Temperature Limit

2007-10-04

arxiv.org/abs/0710.1033v2

Phys. Rev. Lett. 99, 265302 (2007)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 5 figures. Updated following referees comments

Scientific paper

10.1103/PhysRevLett.99.265302

Turbulence, produced by an impulsive spin-down from angular velocity Omega to rest of a cube-shaped container, is investigated in superfluid 4He at temperatures 0.08 K - 1.6 K. The density of quantized vortex lines L is measured by scattering negative ions. Homogeneous turbulence develops after time t of approximately 20 \Omega and decays as L proportional to t^(-3/2). The corresponding energy flux epsilon = nu' (kappa L)^2, which is proportional to t^(-3), is characteristic of quasi-classical turbulence at high Re with a saturated energy-containing length. The effective kinematic viscosity in the T=0 limit is nu' = 0.003 kappa, where kappa=10^(-3) cm^2 / s is the circulation quantum.

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