Abstract
We describe the first measurements of line-density fluctuations and spatial correlations of quantum turbulence in superfluid . 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 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.
- Received 3 June 2008
DOI:https://doi.org/10.1103/PhysRevLett.101.065302
©2008 American Physical Society