Experimental Signature of Quantum Turbulence in Velocity Spectra?

Julien Salort (1) , Francesca Chillà (1) , Éléonore Rusaouën (2) , Philippe-E. Roche (2) , Mathieu Gibert (2) , Iouri Moukharski (3) , Alan Braslau (3) , François Daviaud (3) , Basile Gallet (3) , Ewe-Wei Saw (3) , Bérengère Dubrulle (3) , Pantxo Diribarne (4) , Bernard Rousset (4) , Michel Bon-Mardion (4) , Jean-Paul Moro (4) , Alain Girard (4) , Christophe Baudet (5) , Victor S. L'Vov (6) , Andrei I. Golov (7) , Sergey Nazarenko (8)

1 Phys-ENS - Laboratoire de Physique de l'ENS Lyon
2 NEEL - HELFA - Hélium : du fondamental aux applications
3 SPHYNX - Systèmes Physiques Hors-équilibre, hYdrodynamique, éNergie et compleXes
4 DSBT - Département des Systèmes Basses Températures
5 LEGI - Laboratoire des Écoulements Géophysiques et Industriels [Grenoble]
6 Weizmann Institute of Science [Rehovot, Israël]
7 University of Manchester [Manchester]
8 INPHYNI - Institut de Physique de Nice

Velocity measurements in turbulent superfluid helium between co-rotating propellers are reported. The parameters are chosen such that the flow is fully turbulent, and its dissipative scales are partly resolved by the velocity sensors. This allows for the first experimental comparison of spectra in quantum versus classical turbulence where dissipative scales are resolved. In some specific conditions, differences are observed, with an excess of energy at small scales in the quantum case compared to the classical one. This difference is consistent with the prediction of a pileup of superfluid kinetic energy at the bottom of the inertial cascade of turbulence due to a specific dissipation mechanism.

Mots clés: Quantum Fluids; Turbulence; Superfluidity

Domaines: Mécanique des fluides [physics.class-ph]

Julien Salort, Francesca Chillà, Éléonore Rusaouën, Philippe-E. Roche, Mathieu Gibert, et al.. Experimental Signature of Quantum Turbulence in Velocity Spectra?. New Journal of Physics, 2021, 23, pp.063005. ⟨10.1088/1367-2630/abfe1f⟩. ⟨hal-03132496v2⟩