Vortex density spectrum of quantum turbulence

Philippe-Emmanuel Roche (1) , Pantxo Diribarne , Thomas Didelot , Olivier Français (2, 3) , Lionel Rousseau (2) , Hervé Willaime (4)

1 NEEL - HELFA - Hélium : du fondamental aux applications
2 ESIEE Paris
3 CNAM - Conservatoire National des Arts et Métiers [CNAM]
4 ESPCI Paris - Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris

The fluctuations of the vortex density in a turbulent quantum fluid are deduced from local second-sound attenuation measurements. These measurements are performed with a micromachined open-cavity resonator inserted across a flow of turbulent He-II near 1.6 K. The power spectrum of the measured vortex line density is compatible with a (-5/3) power law. The physical interpretation, still open, is discussed.

Mots clés: superfluid; vorticity; enstrophy; quantum turbulence; spectrum; 4He; second sound; coflow

Domaines: Autre [cond-mat.other]; Mécanique des fluides [physics.class-ph]; Mécanique des fluides [physics.class-ph]

Philippe-Emmanuel Roche, Pantxo Diribarne, Thomas Didelot, Olivier Français, Lionel Rousseau, et al.. Vortex density spectrum of quantum turbulence. EPL - Europhysics Letters, 2007, 77, pp.66002. ⟨10.1209/0295-5075/77/66002⟩. ⟨hal-00122996⟩