Fluctuations and Correlations of Pure Quantum Turbulence in Superfluid 3He-B.
We describe the first measurements of line-density fluctuations and spatial correlations of quantum turbulence in superfluid 3He-B. All of the measurements are performed in the low-temperature regime, where the normal-fluid density is negligible. The quantum turbulence is generated by a vibrating grid. The vortex-line density is found to have large length-scale correlations, indicating large-scale collective motion of vortices. Furthermore, we find that the power spectrum of fluctuations versus frequency obeys a -5/3 power law which verifies recent speculations that this behavior is a generic feature of fully developed quantum turbulence, reminiscent of the Kolmogorov spectrum for velocity fluctuations in classical turbulence.
Bradley
D I
DI
Department of Physics, Lancaster University, Lancaster, LA1 4YB, United Kingdom.
Fisher
S N
SN
Guénault
A M
AM
Haley
R P
RP
O'Sullivan
S
S
Pickett
G R
GR
Tsepelin
V
V