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
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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 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 -