Decay of Turbulence Generated by Spin-Down to Rest in Superfluid 4He

Decay of Turbulence Generated by Spin-Down to Rest in Superfluid 4He
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自旋下降产生的湍流衰减到超流体 4He 中静止

DOI:
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发表时间:
2008
期刊:
影响因子:
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通讯作者:
A. Levchenko
A. Levchenko
中科院分区:
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文献类型:
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作者:
P. Walmsley;A. Golov;H. Hall;W. Vinen;A. Levchenko

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我们报告了实验的扩展(P.M. Walmsley et al., Phys. Rev. Lett. 99:265302, 2007),该实验涉及在温度为 0.15 K–1.6 K 的立方容器中,从角速度 Ω 到超流体 4He 的其余部分的脉冲自旋所产生的准经典湍流的衰减。量子化涡旋线 L 的密度为通过散射负离子来测量。自旋下降后,在时间 t∼10Ω−1 后观察到涡流的最大密度。通过观察离子沿初始旋转轴的传播,研究了从容器周边扩散到其中心区域的湍流的瞬态动力学。几乎均匀的湍流在时间 t∼100Ω−1 后形成,并以 L∝t−3/2 衰减。 T=0 极限下的有效运动粘度为 ν=0.003κ,其中 κ=10−3 cm2 s−1 是循环量子。
We report on the extension of the experiments (P.M. Walmsley et al., Phys. Rev. Lett. 99:265302, 2007) on the decay of quasiclassical turbulence generated by an impulsive spin-down from angular velocity Ω to rest of superfluid 4He in a cubic container at temperatures 0.15 K–1.6 K. The density of quantized vortex lines L is measured by scattering negative ions. Following the spin-down, the maximal density of vortices is observed after time t∼10Ω−1. By observing the propagation of ions along the axis of the initial rotation, the transient dynamics of the turbulence spreading from the perimeter of the container into its central region is investigated. Nearly homogeneous turbulence develops after time t∼100Ω−1 and decays as L∝t−3/2. The effective kinematic viscosity in T=0 limit is ν=0.003κ, where κ=10−3 cm2 s−1 is the circulation quantum.
传播的超流体涡旋前沿中的量子湍流。
DOI: 10.1103/physrevlett.99.265301
发表时间: 2007
影响因子: 8.6
作者:
Eltsov VB
通讯作者: Eltsov VB
DOI: 10.1103/physrevlett.100.245301
发表时间: 2008-02
影响因子: 8.6
作者:
P. Walmsley;A. Golov
通讯作者: P. Walmsley;A. Golov