Tsai J-C, Tao C-Y, Sun Y-C, Lai C-Y, Huang K-H, Juan W-T, Huang J-R
Institute of Physics, Academia Sinica, Taipei 11529, Taiwan.
Department of Physics, National Taiwan Normal University, Taipei, Taiwan.
Phys Rev E Stat Nonlin Soft Matter Phys. 2015 Sep;92(3):031002. doi: 10.1103/PhysRevE.92.031002. Epub 2015 Sep 4.
We investigate experimentally the steady flows in a cylinder containing two immiscible liquids, with the primary fluid being driven by the upper boundary rotating at constant speeds. The system exhibits interesting interplays between the flow fields and the morphology of the interface, with evidence showing that the remarkable flattop structure is a consequence of the vortex breakdown discovered decades ago, and that the deformability of the interface also feedbacks positively to the development of the vortices. Monitoring the topological structure of the flow fields defines the base states and transitions behind the morphology, whereas our survey over different aspect ratios also reveals rich phenomena of surface instabilities accompanying these steady states.
我们通过实验研究了一个装有两种不混溶液体的圆柱体内的稳定流动，其中主要流体由以恒定速度旋转的上边界驱动。该系统在流场和界面形态之间展现出有趣的相互作用，有证据表明，显著的平顶结构是数十年前发现的涡旋破裂的结果，并且界面的可变形性也对涡旋的发展产生了积极的反馈作用。监测流场的拓扑结构确定了形态背后的基态和转变，而我们对不同纵横比的研究还揭示了伴随这些稳态出现的丰富的表面不稳定性现象。
