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Lookup NU author(s): Dr Andrew Baggaley,
Professor Carlo Barenghi
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Turbulence in the low-temperature phase of liquid helium is a complex state in which a viscous normal fluid interacts with an inviscid superfluid. In the former vorticity consists of eddies of all sizes and strengths; in the latter vorticity is constrained to quantized vortex lines. We compute the frequency spectrum of superfluid vortex density fluctuations and obtain the same f(-5/3) scaling that has been recently observed. We show that the scaling can be interpreted in terms of the spectrum of reconnecting material lines. To perform this calculation we have developed a vortex tree algorithm which considerably speeds up the evaluation of Biot-Savart integrals.
Author(s): Baggaley AW, Barenghi CF
Publication type: Article
Publication status: Published
Journal: Physical Review B
Print publication date: 20/07/2011
ISSN (print): 1098-0121
ISSN (electronic): 1550-235X
Publisher: American Physical Society
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