论文标题
超级流体$^4 $ HE频道逆流中动荡插头的动力学
Dynamics of turbulent plugs in a superfluid $^4$He channel counterflow
论文作者
论文摘要
狭窄通道中超流体HE-4中的量子湍流通常采用移动局部涡流缠结的形式。这种称为湍流塞子的缠结也可以用作更宽的通道中量子湍流的构建。我们报告了在广泛的管理参数中的动力学和结构的各个方面的数值研究。长通道中缠结的不受限制的生长为自然缠结结构提供了独特的视野，包括许多尺度上的超氟运动。我们认为，按照对流扩散反应动力学，插头的边缘将其传播为动荡的前沿。该分析表明，纠结的两个边缘的动力学具有明显不同的性质。我们为前部的运动方程式提供了分析解，该方程定义了它们的形状，速度和有效的扩散率，并为各种流动条件分析这些参数。
Quantum turbulence in superfluid He-4 in narrow channels often takes the form of moving localized vortex tangles. Such tangles, called turbulent plugs, also serve as building blocks of quantum turbulence in wider channels. We report on a numerical study of various aspects of the dynamics and structure of turbulent plugs in a wide range of governing parameters. The unrestricted growth of the tangle in a long channel provides a unique view on a natural tangle structure including superfluid motion at many scales. We argue that the edges of the plugs propagate as turbulent fronts, following the advection-diffusion-reaction dynamics. This analysis shows that the dynamics of the two edges of the tangle have distinctly different nature. We provide an analytic solution of the equation of motion for the fronts that define their shape, velocities and effective diffusivity, and analyze these parameters for various flow conditions.
