Mutual-friction induced instability of normal-fluid vortex tubes in superfluid helium-4

Research output: Contribution to journalLetter

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Abstract

It is shown that, as a result of its interactions with superfluid vorticity, a normal-fluid vortex tube in helium-4 becomes unstable and disintegrates. The superfluid vorticity acquires only a small (few percents of normal-fluid tube strength) polarization, whilst expanding in a front-like manner in the intervortex space of the normal-fluid, forming a dense, unstructured tangle in the process. The accompanied energy spectra scalings offer a structural explanation of analogous scalings in fully developed finite-temperature superfluid turbulence. A macroscopic mutual-friction model incorporating these findings is proposed.
LanguageEnglish
Pages1481-1485
Number of pages5
JournalPhysics Letters A
Volume382
Issue number22
Early online date4 Apr 2018
DOIs
Publication statusPublished - 5 Jun 2018

Fingerprint

vortex tubes
helium isotopes
friction
vorticity
fluids
scaling
energy spectra
turbulence
tubes
polarization
interactions
temperature

Keywords

  • turbulence
  • vortices
  • computation

Cite this

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abstract = "It is shown that, as a result of its interactions with superfluid vorticity, a normal-fluid vortex tube in helium-4 becomes unstable and disintegrates. The superfluid vorticity acquires only a small (few percents of normal-fluid tube strength) polarization, whilst expanding in a front-like manner in the intervortex space of the normal-fluid, forming a dense, unstructured tangle in the process. The accompanied energy spectra scalings offer a structural explanation of analogous scalings in fully developed finite-temperature superfluid turbulence. A macroscopic mutual-friction model incorporating these findings is proposed.",
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Mutual-friction induced instability of normal-fluid vortex tubes in superfluid helium-4. / Kivotides, Demosthenes.

In: Physics Letters A, Vol. 382, No. 22, 05.06.2018, p. 1481-1485.

Research output: Contribution to journalLetter

TY - JOUR

T1 - Mutual-friction induced instability of normal-fluid vortex tubes in superfluid helium-4

AU - Kivotides, Demosthenes

PY - 2018/6/5

Y1 - 2018/6/5

N2 - It is shown that, as a result of its interactions with superfluid vorticity, a normal-fluid vortex tube in helium-4 becomes unstable and disintegrates. The superfluid vorticity acquires only a small (few percents of normal-fluid tube strength) polarization, whilst expanding in a front-like manner in the intervortex space of the normal-fluid, forming a dense, unstructured tangle in the process. The accompanied energy spectra scalings offer a structural explanation of analogous scalings in fully developed finite-temperature superfluid turbulence. A macroscopic mutual-friction model incorporating these findings is proposed.

AB - It is shown that, as a result of its interactions with superfluid vorticity, a normal-fluid vortex tube in helium-4 becomes unstable and disintegrates. The superfluid vorticity acquires only a small (few percents of normal-fluid tube strength) polarization, whilst expanding in a front-like manner in the intervortex space of the normal-fluid, forming a dense, unstructured tangle in the process. The accompanied energy spectra scalings offer a structural explanation of analogous scalings in fully developed finite-temperature superfluid turbulence. A macroscopic mutual-friction model incorporating these findings is proposed.

KW - turbulence

KW - vortices

KW - computation

UR - https://www.sciencedirect.com/science/article/pii/S0375960118303542

U2 - 10.1016/j.physleta.2018.03.051

DO - 10.1016/j.physleta.2018.03.051

M3 - Letter

VL - 382

SP - 1481

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JO - Physics Letters A

T2 - Physics Letters A

JF - Physics Letters A

SN - 0375-9601

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