Energy and vorticity spectra in turbulent superfluid He-4 from T=0 to T-gimel

Article

关键词: LIQUID HELIUM-II;    KELVIN-WAVE TURBULENCE;    HYDRODYNAMIC TURBULENCE;    QUANTUM TURBULENCE;    EXACT RESUMMATIONS;    MUTUAL FRICTION;    CASCADE MODEL;    SHELL MODELS;    HEAT CURRENT;    INTERMITTENCY;   

DOI  :  10.1103/PhysRevB.91.144501

来源: SCIE

【 摘 要 】

We discuss the energy and vorticity spectra of turbulent superfluid He-4 in the entire temperature range from T = 0 up to the phase transition gimel point, T gimel similar or equal to 2.17 K. Contrary to classical developed turbulence in which there are only two typical scales, i.e., the energy injection L and the dissipation scales eta, here, the quantization of vorticity introduces two additional scales, the vortex core radius a(0) and the mean vortex spacing l. We present these spectra for the super-and the normal-fluid components in the entire range of scales from L to a(0) including the crossover scale l where the hydrodynamic eddy cascade is replaced by the cascade of Kelvin waves on individual vortices. At this scale, a bottleneck accumulation of the energy was found earlier at T = 0. We show that even very small mutual friction dramatically suppresses the bottleneck effect due to the dissipation of the Kelvin waves. Using our results for the spectra we estimate the Vinen effective viscosity nu' in the entire temperature range and show agreement with numerous experimental observations for. nu' (T).

【 授权许可】

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