Dissipation of quantum turbulence in the zero temperature limit.
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 approximately 20/Omega and decays as L proportional, t-3/2. The corresponding energy flux =nu'(kappaL)2 proportional, t-3 is characteristic of quasiclassical turbulence at high Re with a saturated energy-containing length. The effective kinematic viscosity in T=0 limit is nu'=0.003kappa, where kappa=10(-3) cm2 s(-1) is the circulation quantum.
Walmsley
P M
PM
School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, United Kingdom.
Golov
A I
AI
Hall
H E
HE
Levchenko
A A
AA
Vinen
W F
WF