On the existence of counterflow induced macroscopic vortex rings in He II

Stamm, G.; Bielert, F.; Fiszdon, W.; Piechna, Janusz

doi:10.1016/0921-4526(94)90624-6

Cited by 5 publications

(4 citation statements)

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“…Using a cylinder-piston arrangement of the same size as Borner's, Murakami et al succeeded in visualizing Borner's large-scale vortex ring and tracking its motion by means of frozen hydrogen-deuterium particles trapped in the cores of individual vortex rings. Stamm and collaborators [9,10] also generated large-scale vortex rings in liquid helium, but using a different technique (second-sound heat pulses), which resulted in vortex structures less stable than Borner's and Murakami's.…”

Section: Introductionmentioning

confidence: 99%

Coherent laminar and turbulent motion of toroidal vortex bundles

2014

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Motivated by experiments performed in superfluid helium, we study numerically the motion of toroidal bundles of vortex filaments in an inviscid fluid. We find that the evolution of these large-scale vortex structures involves the generalised leapfrogging of the constituent vortex rings. Despite three dimensional perturbations in the form of Kelvin waves and vortex reconnections, toroidal vortex bundles retain their coherence over a relatively large distance (compared to their size), in agreement with experimental observations.Comment: 22 pages, 12 figure

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Section: Introductionmentioning

confidence: 99%

Coherent laminar and turbulent motion of toroidal vortex bundles

2014

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“…Notably, these couplings are only active along quantized vortex contours. Hence, both classical and superfluid vortex rings are present at finite temperature, BEC quantum flows, and their interactions are expected to be key features of superfluid turbulence physics [5][6][7]. In this Letter, an analysis of normal-fluid/superfluid vortex-ring interactions is attempted.…”

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confidence: 99%

Interactions between normal-fluid and superfluid vortex rings in helium-4

Kivotides¹

2015

EPL

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-By employing both vortex-dynamical and self-consistent Navier-Stokes methods of analysis, an investigation of interactions between normal-fluid and superfluid vortex rings in helium-4 is performed. It is shown that, under the influence of normal-fluid vortices, superfluid vortices grow in size in order to match the size of the latter. In turbulence, this mechanism hints to a tendency towards scale-to-scale energy equipartition in the spectral regimes corresponding to the inertial-range in the normal-fluid. Yet, the analysis shows that the induced superfluid vorticity is not trapped by the cores of the normal-fluid vortices, and, consequently, there is no strong correlation between normal-fluid and induced superfluid vorticity patterns. Hence, there is no significant vortex locking effect.

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“…One infers that a large-scale macroscopic vortex ring was created, consisting of a large number (N = Γ/κ ≈ 10 3 ) of individual, concentric, coaxial superfluid vortex rings travelling in the same direction -essentially a compact bundle of rings. This interpretation was strengthened by further experiments [13,14], particularly by Murakami and collaborators [15] who directly visualized the bundle using frozen hydrogen-deuterium particles.…”

Section: Introductionmentioning

confidence: 96%

Large-scale superfluid vortex rings at nonzero temperatures

2014

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We numerically model experiments in which large-scale vortex rings - bundles of quantized vortex loops - are created in superfluid helium by a piston-cylinder arrangement. We show that the presence of a normal fluid vortex ring together with the quantized vortices is essential to explain the coherence of these large-scale vortex structures at nonzero temperatures, as observed experimentally. Finally we argue that the interaction of superfluid and normal fluid vortex bundles is relevant to recent investigations of superfluid turbulence.Comment: 8 pages, 5 figure

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On the existence of counterflow induced macroscopic vortex rings in He II

Cited by 5 publications

References 1 publication

Coherent laminar and turbulent motion of toroidal vortex bundles

Coherent laminar and turbulent motion of toroidal vortex bundles

Interactions between normal-fluid and superfluid vortex rings in helium-4

Large-scale superfluid vortex rings at nonzero temperatures

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