Decay of finite temperature superfluid helium-4 turbulence

Research output: Contribution to journalArticle

  • 3 Citations

Abstract

A mesoscopic model of superfluid helium-4, that describes the dynamics of individual topological defects of the ground state (superfluid vortices) and their (self-consistent) interactions with its quasi-particle excitations (normal-fluid), is solved numerically in order to analyse the physics of decaying homogeneous, isotropic turbulence. The calculations predict several temporal decay regimes not present in classical turbulence decay, the corresponding superfluid and normal-fluid energy spectra, and the experimentally observed <sup>t-1.5</sup> scaling for the superfluid vortex line density at large times. The results demonstrate that the origin of this scaling is the energy spent by the superfluid in order to sustain a fluctuating low Reynolds number flow in the normal-fluid, and not the locking of turbulent superfluid and normal-fluid vorticities.

LanguageEnglish
Pages68-76
Number of pages9
JournalJournal of Low Temperature Physics
Volume181
Issue number1
Early online date30 Jun 2015
DOIs
Publication statusPublished - 1 Oct 2015

Fingerprint

Superfluid helium
helium isotopes
Turbulence
turbulence
Fluids
fluids
decay
Vortex flow
vortices
scaling
Temperature
isotropic turbulence
temperature
low Reynolds number
elementary excitations
Vorticity
vorticity
Ground state
locking
Reynolds number

Keywords

  • energy spectra
  • superfluid turbulence decay
  • vortex line density scalings

Cite this

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Decay of finite temperature superfluid helium-4 turbulence. / Kivotides, Demosthenes.

In: Journal of Low Temperature Physics, Vol. 181, No. 1, 01.10.2015, p. 68-76.

Research output: Contribution to journalArticle

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