### 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.

Language | English |
---|---|

Pages | 68-76 |

Number of pages | 9 |

Journal | Journal of Low Temperature Physics |

Volume | 181 |

Issue number | 1 |

Early online date | 30 Jun 2015 |

DOIs | |

Publication status | Published - 1 Oct 2015 |

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### Keywords

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

### Cite this

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*Journal of Low Temperature Physics*, vol. 181, no. 1, pp. 68-76. https://doi.org/10.1007/s10909-015-1320-z

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

Research output: Contribution to journal › Article

TY - JOUR

T1 - Decay of finite temperature superfluid helium-4 turbulence

AU - Kivotides, Demosthenes

PY - 2015/10/1

Y1 - 2015/10/1

N2 - 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 t-1.5 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.

AB - 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 t-1.5 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.

KW - energy spectra

KW - superfluid turbulence decay

KW - vortex line density scalings

UR - http://www.scopus.com/inward/record.url?scp=84940436039&partnerID=8YFLogxK

U2 - 10.1007/s10909-015-1320-z

DO - 10.1007/s10909-015-1320-z

M3 - Article

VL - 181

SP - 68

EP - 76

JO - Journal of Low Temperature Physics

T2 - Journal of Low Temperature Physics

JF - Journal of Low Temperature Physics

SN - 0022-2291

IS - 1

ER -