Turbulent velocity spectra in superfluid flows

Julien Salort 1 Christophe Baudet 2 Bernard Castaing 3 Benoît Chabaud 1 François Daviaud 4 Thomas Didelot Pantxo Diribarne 3, 5 Bérengère Dubrulle 4 Yves Gagne 2 Frédéric Gauthier Alain Girard 5 Bernard Hébral 1 Bernard Rousset 5 Pierre Thibault 5 Philippe-Emmanuel Roche 1
1 HELFA - Hélium : du fondamental aux applications
NEEL - Institut Néel
2 LEGI - Laboratoire des Écoulements Géophysiques et Industriels [Grenoble]
3 Phys-ENS - Laboratoire de Physique de l'ENS Lyon
4 SPEC - UMR3680 - Service de physique de l'état condensé
5 SBT - Service des Basses Températures
Abstract : We present velocity spectra measured in three cryogenic liquid 4He steady flows: grid and wake flows in a pressurized wind tunnel capable of achieving mean velocities up to 5 m/s at temperatures above and below the superfluid transition, down to 1.7 K, and a "chunk" turbulence flow at 1.55 K, capable of sustaining mean superfluid velocities up to 1.3 m/s. Depending on the flows, the stagnation pressure probes used for anemometry are resolving from one to two decades of the inertial regime of the turbulent cascade. We do not find any evidence that the second order statistics of turbulence below the superfluid transition differ from the ones of classical turbulence, above the transition.
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Julien Salort, Christophe Baudet, Bernard Castaing, Benoît Chabaud, François Daviaud, et al.. Turbulent velocity spectra in superfluid flows. Physics of Fluids, American Institute of Physics, 2010, 22, pp.125102. ⟨10.1063/1.3504375⟩. ⟨hal-00508872v2⟩

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