Coherent structure formation in turbulent thermal superfluids

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

By means of numerical calculations, we show that in turbulent thermal superfluids the normal fluid induces coherent bundles of quantized line vortices in the superfluid. These filamentary structures are formed in between the normal fluid vortices, acquiring eventually comparable circulation. They are self-stretched and evolve according to self-regulating dynamics. Their spectrum mimics the normal fluid spectrum with the mutual friction force exciting the large scales and damping the small scales. Strongly interacting triads of them merge sporadically into stronger, braided vortex filaments, inducing strong fluctuations in the system's energetics. A theoretical account of the system's statistical mechanics is proposed.
Original languageEnglish
Article number175301
Number of pages4
JournalPhysical Review Letters
Volume96
Issue number17
DOIs
Publication statusPublished - 3 May 2006

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fluids
vortices
vortex filaments
automatic control
statistical mechanics
bundles
friction
damping

Keywords

  • flow of fluids
  • friction
  • statistical mechanics
  • thermal effects
  • turbulence
  • vortex flow
  • waveguide circulators

Cite this

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Coherent structure formation in turbulent thermal superfluids. / Kivotides, Demosthenes.

In: Physical Review Letters, Vol. 96, No. 17, 175301, 03.05.2006.

Research output: Contribution to journalArticle

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KW - friction

KW - statistical mechanics

KW - thermal effects

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KW - vortex flow

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