Coexistence and interplay of quantum and classical turbulence in superfluid 4He: Decay, velocity decoupling, and counterflow energy spectra
Coexistence and interplay of quantum and classical turbulence in superfluid 4He: Decay, velocity decoupling, and counterflow energy spectra
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DOI：
10.1103/physrevb.94.174504
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发表时间：
2016-11-11
影响因子：
3.7
通讯作者：
Varga, E.
中科院分区：
文献类型：
--
作者：
Babuin, S.;L'vov, V. S.;Varga, E.
我们报告补充的实验，数值和理论研究的湍流同向流，逆流，和纯超流的超流体He-4在一个通道中，导致在物理上透明的和相对简单的模型的衰减量子湍流，占共存的量子和经典组件的相互作用的湍流超流体He-4。我们进一步提供了一个分析理论的稳态量子湍流的能量谱的逆流和纯超流，基于代数近似的能量通量的尺度。由此产生的频谱不是经典的Kolmogorov形式，但强烈抑制的相互摩擦，导致在所有尺度的能量耗散，增强了由逆流引起的正常和超流速度波动的解耦。
We report complementary experimental, numerical, and theoretical study of turbulent coflow, counterflow, and pure superflow of superfluid He-4 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 He-4. 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.