Dissipation enhancement from a single vortex reconnection in superfluid helium

Abstract

We investigate a single vortex reconnection event in superfluid helium at finite temperatures using the vortex filament model. The reconnection induces Kelvin waves which strongly increase energy dissipation. We evaluate the mutual friction dissipation from the reconnection and show that the dissipation power has universal form, which is seen by scaling both time (measured from the reconnection event) and power by the mutual friction parameter alpha. This observation allows us to conclude that the Kelvin-wave cascade is not important in the energy dissipation process within the range alpha > 0.001. Rather, the energy is directly transferred from Kelvin waves to the normal component. Moreover, while the excited Kelvin waves greatly enhance energy dissipation, no similar change is seen in angular momentum from the reconnection event. This result has similarities with recent 3He-B measurements. Our results also confirm another earlier observation that the minimum distance between vortices scales approximately as d ~ sqrt(|t-trec|), both before and after the reconnection event.

arXiv comment8 pages, 6 figures; v2: moderate changes; v3: minor changes

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Cited by in corpus (14)

• Vortex filament method as a tool for computational visualization of quantum turbulence
• Structure of quantum vortex tangle in He-4 counterflow turbulence
• Rotating quantum turbulence in the unitary Fermi gas
• Reconnections of quantized vortex rings in superfluid ${}^4$He at very low temperatures
• Kelvin waves and the decay of quantum superfluid turbulence
• Quantum turbulence in superfluids with wall-clamped normal component
• Interactions between unidirectional quantized vortex rings
• Reconnection of vortex filaments and Kolmogorov spectrum
• Dissipative quintessence, and its cosmological implications
• Dynamics of quantized vortices moving towards reconnection
• Kelvin waves from vortex reconnection in superfluid helium at low temperatures
• Scattering of Line-Ring Vortices in a Superfluid
• Reconnection dynamics and mutual friction in quantum turbulence
• Comment on "Reconnection of quantized vortex filaments and the Kolmogorov spectrum"