Four regimes of decaying grid turbulence in a finite channel.
Four regimes of decaying grid turbulence in a finite channel.
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有限通道中衰减网格湍流的四种状态。
DOI：
10.1103/physrevlett.85.2973
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发表时间：
2000
影响因子：
8.6
通讯作者：
Russell J. Donnelly
中科院分区：
文献类型：
--
作者：
L. Skrbek;Joseph Niemela;Russell J. Donnelly
衰减的第二个声音在氦II已被用来观察到6个数量级的衰减涡显示四个明显不同的制度，在一个有限的通道衰减网格湍流。在1.2<T<2K的温度范围内，氦II涡度的衰减主要由一个纯经典的均匀各向同性湍流谱模型来描述。这四个政权开关连续的能量包含和耗散的柯尔莫哥洛夫长度尺度逐渐增长的衰减过程中，最后都饱和的大小的通道。
Attenuation of second sound in helium II has been used to observe up to 6 orders of magnitude of decaying vorticity displaying four distinctly different regimes of decaying grid turbulence in a finite channel. A purely classical spectral model for homogeneous and isotropic turbulence describes most of the decay of helium II vorticity in the temperature range 1.2<T<2 K. The four regimes switch successively as the energy-containing and dissipative Kolmogorov length scales gradually grow during the decay, finally both being saturated by the size of the channel.