Low Temperature Physics: 43, 200 (2017); https://doi.org/10.1063/1.4976638
Fizika Nizkikh Temperatur: Volume 43, Number 2 (February 2017), p. 245-252    ( to contents , go back )

Counterflow energy spectra of quantum turbulence at finite temperatures

V.A. Andryushchenko and L.P. Kondaurova

Institute of Thermophysics, 1 Lavrentyev Ave., Novosibirsk 630090, Russia Novosibirsk State University, Novosibirsk, Russia
E-mail: louisa@ngs.ru

Novosibirsk State University, street. Pirogova, 2, Novosibirsk, 630090, Russia
pos Анотація:

Received August 1, 2016

Abstract

The spectrum of the energy generated by the vortex tangle in counterflow of normal and superfluid components at different temperatures was obtained. The counterflow magnitude was varied from 0.3 cm/s to 1.2 cm/s and the temperature was varied from 1.3 K to 1.9 K. It was shown that E(k) ~ k–α at intervortex scale, where 1.3 < α < 1.4 depending on the temperature. At larger scales E(k) ~ k–1. It was obtained that change of the kinetic energy per unit mass is proportional to the cube of the counterflow of normal and superfluid components at Gorter–Mellink mode, thus the energy dissipation originate from friction between normal component of helium and vortex tangle.

PACS: 67.25.dk Vortices and turbulence;
PACS: 47.37.+q Hydrodynamic aspects of super-fluidity; quantum fluids;
PACS: 03.75.Kk Dynamic properties of conden-sates; collective and hydrodynamic excita-tions, superfluid flow.

Key words: superfluidity, vortex structure, quantum turbulence.

Published online: December 26, 2016

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