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
Novosibirsk State University, street. Pirogova, 2, Novosibirsk, 630090, Russia pos Анотація:
Received August 1, 2016
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.