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Coupled normal fluid and superfluid profiles of turbulent helium II in channels

Lookup NU author(s): Dr Luca Galantucci, Dr Michele Sciacca, Professor Carlo Barenghi

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Abstract

We perform fully coupled two-dimensional numerical simulations of plane channel helium II counterflows with vortex-line density typical of experiments. The main features of our approach are the inclusion of the back reaction of the superfluid vortices on the normal fluid and the presence of solid boundaries. Despite the reduced dimensionality, our model is realistic enough to reproduce vortex density distributions across the channel recently calculated in three dimensions. We focus on the coarse-grained superfluid and normal fluid velocity profiles, recovering the normal fluid profile recently observed employing a technique based on laser-induced fluorescence of metastable helium molecules.

Publication metadata

Author(s): Galantucci L, Sciacca M, Barenghi CF

Publication type: Article

Publication status: Published

Journal: Physical Review B

Year: 2015

Volume: 92

Issue: 17

Print publication date: 01/11/2015

Online publication date: 30/11/2015

Acceptance date: 01/10/2015

Date deposited: 30/12/2015

ISSN (print): 1098-0121

ISSN (electronic): 1550-235X

Publisher: American Physical Society

URL: http://dx.doi.org/10.1103/PhysRevB.92.174530

DOI: 10.1103/PhysRevB.92.174530

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