Dissipation of quantum turbulence in the zero temperature limit.
Dissipation of quantum turbulence in the zero temperature limit.
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零温度极限下量子湍流的耗散。
DOI：
10.1103/physrevlett.99.265302
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发表时间：
2007
影响因子：
8.6
通讯作者：
W. Vinen
中科院分区：
文献类型：
--
作者：
P. Walmsley;A. Golov;H. Hall;A. Levchenko;W. Vinen
在温度为0.08 K-1.6 K的超流体4He中，研究了由角速度为Omega的脉冲自旋向立方体容器的其余部分所产生的湍流。用负离子散射法测量了量子化涡线的密度。均匀湍流在时间t约为20/ ω后发展，并按L成比例t-3/2衰减。对应的能量通量=nu'(kappaL)2成比例，t-3是高Re下饱和含能长度准经典湍流的特征。T=0极限下的有效运动粘度为nu'=0.003kappa，其中kappa=10(-3) cm2 s（-1）为循环量子。
Turbulence, produced by an impulsive spin down from angular velocity Omega to rest of a cube-shaped container, is investigated in superfluid 4He at temperatures 0.08 K-1.6 K. The density of quantized vortex lines L is measured by scattering negative ions. Homogeneous turbulence develops after time t approximately 20/Omega and decays as L proportional, t-3/2. The corresponding energy flux =nu'(kappaL)2 proportional, t-3 is characteristic of quasiclassical turbulence at high Re with a saturated energy-containing length. The effective kinematic viscosity in T=0 limit is nu'=0.003kappa, where kappa=10(-3) cm2 s(-1) is the circulation quantum.