Volume 77, Number 6, March 2007
|Number of page(s)||5|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||28 February 2007|
Vortex density spectrum of quantum turbulence
Institut NÉEL, CNRS & Université J. Fourier - 25 avenue des Martyrs, BP166, F-38042 Grenoble Cedex 9, France
2 Groupe ESIEE, Chambre de Commerce et d'Industrie de Paris - Cité Descartes, BP99, 2 boulevard Blaise Pascal, 93162 Noisy le Grand Cedex, France
3 Conservatoire National des Arts et Métiers, Laboratoire de Physique - 2 rue Conté, 75003 Paris, France
4 Ecole Supérieure de Physique et de Chimie Industrielles de la Ville de Paris - 10 rue Vauquelin, 75231 Paris Cedex 05, France
Accepted: 29 January 2007
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 frequency power spectrum of the measured vortex line density is compatible with a power law. The physical interpretation is discussed.
PACS: 67.40.Vs – Vortices and turbulence / 47.37.+q – Hydrodynamic aspects of superfluidity; quantum fluids / 67.57.De – Quantum fluids and solids; liquid and solid helium: Superflow and hydro- dynamics
© Europhysics Letters Association, 2007
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