Search for an Experimental Signature of Quantum Turbulence in Velocity Spectra
Résumé
Velocity measurements in turbulent superfluid helium betweenco-rotatingpropellers are reported.The parameters are chosen such that the flow is fully turbulent, and its dissipative scales are partlyresolved by the velocity sensors. This allows for the first experimental comparison of spectra in quan-tumversusclassical 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 tothe classical one. This difference is consistent with the prediction of a pileup of superfluid kineticenergy at the bottom of the inertial cascade of turbulence due to a specific dissipation mechanism.
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