Fizika Nizkikh Temperatur: Volume 44, Number 10 (October 2018), p. 1302-1307    ( to contents , go back )

Dynamics of vortex loops after reconnection in superfluid helium at different temperatures

V.A. Andryushchenko and L.P. Kondaurova

Institute of Thermophysics, 1 Lavrentyev Ave., Novosibirsk 630090, Russia Novosibirsk State University, Novosibirsk, Russia

Novosibirsk State University, 2 Pirogova Str., Novosibirsk 630090 Russia
E-mail: louisa@ngs.ru

Received May 7, 2018, published online August 28, 2018

Abstract

This paper is devoted to the numerical modeling of the dynamics of vortex loops in superfluid helium after their reconnection at different temperatures. The simulation was performed within the vortex filament method using the full Biot–Savar equation. It is established that the dynamics of the vortex loops essentially depend on the initial location of the loops and the temperature, which is expressed in the number and size of the formed loops, the amplitude and character of the attenuation of the Kelvin waves, as well as the speed of the loops and their individual elements. However, the dependence of the distance between the nearest elements formed by a vortex loop from time is described by a power law with exponent equal to 1/2, as before the moment of reconnection.

Key words: superfluid helium, vortex filaments, reconnection, Kelvin waves.

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