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 (4)He 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 approximate to 20/Omega and decays as L proportional to t(-3/2). The corresponding energy flux epsilon=nu'(kappa L)(2)proportional to 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'=0.003 kappa, where kappa=10(-3) cm(2) s(-1) is the circulation quantum.