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Lookup NU author(s): Professor Carlo Barenghi,
Emeritus Professor Yuri Sergeev
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
The article presents results obtained based on numerical simulation of two-dimensional vortex points and inertial tracer particles in two-component counterflowing superfluid He-II. In the low temperature limit (no normal fluid, no friction) our model would reduce to Onsager’s famous vortex gas. The flow of the normal component of the He-II is assumed uniform, while the superfluid velocity field is induced by vortex points which model three-dimensional quantized vortex lines. Probability density functions of velocity and acceleration of tracer particles and superfluid velocity field are obtained. We find that tails of probability distributions follow power-laws with various exponents, except in the case of sufficiently coarse-grained superfluid velocity field, where Gaussian shape is observed. The decay of the number of vortices is also studied, yielding results in agreement with Vinen’s phenomenological model of quantum turbulence.
Author(s): Varga E, Barenghi CF, Sergeev YA, Skrbek L
Publication type: Article
Publication status: Published
Journal: EPJ - The European Physical Journal (WoC)
Print publication date: 25/03/2014
Date deposited: 14/05/2014
ISSN (electronic): 2100-014X
Publisher: EDP Sciences
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