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Quantum turbulence at finite temperature: The two-fluids cascade

Lookup NU author(s): Professor Carlo Barenghi

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Abstract

To model isotropic homogeneous quantum turbulence in superfluid helium, we have performed Direct Numerical Simulations (DNS) of two fluids (the normal fluid and the superfluid) coupled by mutual friction. We have found evidence of strong locking of superfluid and normal fluid along the turbulent cascade, from the large scale structures where only one fluid is forced down to the vorticity structures at small scales. We have determined the residual slip velocity between the two fluids, and, for each fluid, the relative balance of inertial, viscous and friction forces along the scales. Our calculations show that the classical relation between energy injection and dissipation scale is not valid in quantum turbulence, but we have been able to derive a temperature-dependent superfluid analogous relation. Finally, we discuss our DNS results in terms of the current understanding of quantum turbulence, including the value of the effective kinematic viscosity. Copyright (C) EPLA, 2009

Publication metadata

Author(s): Roche PE, Barenghi CF, Leveque E

Publication type: Article

Publication status: Published

Journal: Europhysics Letters

Year: 2009

Volume: 87

Issue: 5

Pages: -

ISSN (print): 0295-5075

ISSN (electronic): 1286-4854

Publisher: EDP Sciences

URL: http://dx.doi.org/10.1209/0295-5075/87/54006

DOI: 10.1209/0295-5075/87/54006

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