Probing Vortex Density Fluctuations in Superfluid Turbulence

Philippe-Emmanuel Roche (1) , Benoît Chabaud (1) , Olivier Français (2) , Lionel Rousseau (2) , Hervé Willaime (3)

1 NEEL - HELFA - Hélium : du fondamental aux applications
2 ESIEE Paris
3 ESPCI Paris - Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris

Quantum fluids -such as superfluid helium- are recognized as a model-fluids for turbulence research because their dynamics result from the tangle of quantized vortex lines. We report a time-resolved measurements of the local vortex line density in a turbulent quantum flow, here 4He at 1.6 K. The sensor is a micromachined second sound resonator inserted across the flow. Over one decade of inertial range, the spectrum exhibits a -1.6 power law scaling, compatible with a -5/3 exponent.

Domaines: Autre [cond-mat.other]; Mécanique des fluides [physics.class-ph]; Mécanique des fluides [physics.class-ph]; Dynamique des Fluides [physics.flu-dyn]; Instrumentations et Détecteurs [physics.ins-det]

Philippe-Emmanuel Roche, Benoît Chabaud, Olivier Français, Lionel Rousseau, Hervé Willaime. Probing Vortex Density Fluctuations in Superfluid Turbulence. 11th EUROMECH European Turbulence Conference, Jun 2007, Porto, Portugal. pp.532-534, ⟨10.1007/978-3-540-72604-3_169⟩. ⟨hal-00198149⟩