Fluctuations and correlations of pure quantum turbulence in superfluid 3He-B
Fluctuations and correlations of pure quantum turbulence in superfluid 3He-B
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DOI：
10.1103/physrevlett.101.065302
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发表时间：
2008-08-08
影响因子：
8.6
通讯作者：
Tsepelin, V.
中科院分区：
文献类型：
--
作者：
Bradley, D. I.;Fisher, S. N.;Tsepelin, V.
我们首次测量了超流体（3）He-B中量子湍流的线密度涨落和空间关联。所有的测量都是在低温状态下进行的，其中正常流体密度可以忽略不计。量子湍流是由振动的网格产生的。涡线密度具有较大的长度尺度相关性，表明涡的大尺度集体运动。此外，我们发现波动的功率谱与频率服从-5/3的幂律，这验证了最近的猜测，这种行为是一个通用的功能，充分发展的量子湍流，让人想起经典湍流中的速度波动的柯尔莫哥洛夫谱。
We describe the first measurements of line-density fluctuations and spatial correlations of quantum turbulence in superfluid (3)He-B. All of the measurements are performed in the low-temperature regime, where the normal-fluid density is negligible. The quantum turbulence is generated by a vibrating grid. The vortex-line density is found to have large length-scale correlations, indicating large-scale collective motion of vortices. Furthermore, we find that the power spectrum of fluctuations versus frequency obeys a -5/3 power law which verifies recent speculations that this behavior is a generic feature of fully developed quantum turbulence, reminiscent of the Kolmogorov spectrum for velocity fluctuations in classical turbulence.