Macroscopic vortices on the surface of superfluid He II
Macroscopic vortices on the surface of superfluid He II
复制标题
超流体 He II 表面的宏观涡旋
DOI：
10.1063/1.5055837
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发表时间：
2018
影响因子：
0.8
通讯作者：
A. Pel’menev
中科院分区：
文献类型：
--
作者：
A. Levchenko;L. Mezhov;A. Pel’menev
通过位于流体表面下方薄层中的光玻璃示踪剂对超流体 He II 表面现象进行可视化，首次可以观察到由于非共线法拉第波之间的非线性相互作用而在振动单元中的超流体表面上形成的涡流和二维宏观涡流的出现。法拉第驻波在 He II 表面上被激发，电池垂直振荡，相对变量加速度高于参数不稳定性阈值 β > βc ≈ 0.04。研究发现，在频率为 40 Hz 的强烈波泵浦过程中，长时间暴露～270 秒时，涡流系统的动能对 k ≥ 4.5 cm–1 时的波矢 E(k) 的依赖性可以描述为 E(k) ～ k–3 形式的幂律。换句话说，随着时间的推移，深度为~0.4 cm的He II层表面波产生的宏观涡流系统中可能会出现逆湍流级联和直接湍流级联。通过位于流体表面下方的薄层中的光玻璃示踪剂对超流体He II表面现象进行可视化，使得首次能够观察到涡流和二维宏观涡流的出现。由于非共线法拉第波之间的非线性相互作用，在振动单元中的超流体表面上形成了这种现象。法拉第驻波在 He II 表面上被激发，电池垂直振荡，相对变量加速度高于参数不稳定性阈值 β > βc ≈ 0.04。研究发现，在频率为 40 Hz 的强烈波泵浦过程中，长时间暴露～270 秒时，涡流系统的动能对 k ≥ 4.5 cm–1 时的波矢 E(k) 的依赖性可以描述为 E(k) ～ k–3 形式的幂律。换句话说，随着时间的推移，在由水产生的宏观涡流系统中可能会出现逆湍流级联和直接湍流级联。
The visualization of phenomena on the surface of superfluid He II by means of light glass tracers located in a thin layer below the surface of the fluid has made it possible to observe, for the first time, the appearance of a vortex flow and two-dimensional macroscopic vortices that are formed on the surface of the superfluid in a vibrating cell as a result of nonlinear interaction between noncollinear Faraday waves. Standing Faraday waves are excited on the He II surface with vertical oscillations of the cell with relative variable acceleration above the threshold of the parametric instability β > βc ≈ 0.04. It was found that during intense wave-pumping at a frequency of 40 Hz with prolonged exposure for ∼270 seconds, the dependence of the kinetic energy of a vortex system on the wave vector E(k) at k ≥ 4.5 cm–1 can be described as a power law of the form E(k) ∼ k–3. In other words, with time, both an inverse turbulent cascade and a direct one may arise in a system of macroscopic vortices generated by waves on the surface of an He II layer with a depth of ∼0.4 cm.The visualization of phenomena on the surface of superfluid He II by means of light glass tracers located in a thin layer below the surface of the fluid has made it possible to observe, for the first time, the appearance of a vortex flow and two-dimensional macroscopic vortices that are formed on the surface of the superfluid in a vibrating cell as a result of nonlinear interaction between noncollinear Faraday waves. Standing Faraday waves are excited on the He II surface with vertical oscillations of the cell with relative variable acceleration above the threshold of the parametric instability β > βc ≈ 0.04. It was found that during intense wave-pumping at a frequency of 40 Hz with prolonged exposure for ∼270 seconds, the dependence of the kinetic energy of a vortex system on the wave vector E(k) at k ≥ 4.5 cm–1 can be described as a power law of the form E(k) ∼ k–3. In other words, with time, both an inverse turbulent cascade and a direct one may arise in a system of macroscopic vortices generated by wa...
T=0 极限下量子湍流中量子流和经典流的共存。
影响因子：
8.6
作者：
Walmsley PM
通讯作者：
Walmsley PM
影响因子：
3.7
作者：
Marakov, A.;Gao, J.;Vinen, W. F.
通讯作者：
Vinen, W. F.