0486373 - FZÚ 2018 RIV US eng J - Journal Article
Babuin, Simone - L'vov, V.S. - Pomyalov, A. - Skrbek, L. - Varga, E.
Coexistence and interplay of quantum and classical turbulence in superfluid 4He: Decay, velocity decoupling, and counterflow energy spectra.
Physical Review B. Roč. 94, č. 17 (2016), s. 1-18, č. článku 174504. ISSN 2469-9950. E-ISSN 2469-9969
Institutional support: RVO:68378271
Keywords : liquid helium-ii * 3-dimensional vortex dynamics * mutual friction * heat current * hydrodynamic turbulence * 2-fluid flow
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.836, year: 2016 ; AIS: 1.227, rok: 2016
DOI: https://doi.org/10.1103/PhysRevB.94.174504

We report complementary experimental, numerical, and theoretical study of turbulent coflow, counterflow, and pure superflow of superfluid 4 He in a channel, resulting in a physically transparent and relatively simple model of decaying quantum turbulence that accounts for interactions of coexisting quantum and classical components of turbulent superfluid 4 He. We further offer an analytical theory of the energy spectra of steady-state quantum turbulence in the counterflow and pure superflow, based on algebraic approximation for the energy fluxes over scales. The resulting spectra are not of the classic Kolmogorov form, but strongly suppressed by the mutual friction, leading to the energy dissipation at all scales, enhanced by the counterflow-induced decoupling of the normal and superfluid velocity fluctuations.

Permanent Link: http://hdl.handle.net/11104/0281206