Decay of Turbulence Generated by Spin-Down to Rest in Superfluid 4He
Decay of Turbulence Generated by Spin-Down to Rest in Superfluid 4He
复制标题
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
中科院分区:
文献类型:
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作者:
P. Walmsley;A. Golov;H. Hall;W. Vinen;A. Levchenko
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.
影响因子:
8.6
作者:
Eltsov VB
通讯作者:
Eltsov VB
影响因子:
8.6
作者:
P. Walmsley;A. Golov
通讯作者:
P. Walmsley;A. Golov