The paper analyzes the complex topology of swirling flows generated in the cylinder by its rotating end face. Using the flow visualization for different parameters of swirl of the upper end of the cylinder, the general laws of the evolution of the region with a counter flow (bubble-like vortex decay) are shown regardless of the contact of the studied vortex flow with various liquids or gas at the free end. The research has found for the first time that the scenario for the appearance of the bubble-like breakdown region depends weakly on the properties of the medium that restricts the circulation of the working fluid, but differs significantly from the dynamics of vortex flows limited by the “solid” second wall - the fixed end of the cylinder. For example, during the axial vortex breakdown, the modes of stationary vortex motion with the appearance of the recirculation zone contact with the interface surface of two media have been revealed, which is not typical for closed flows.The results obtained are of interest for further development of vortex devices and reactors that provide complex vortex motion of ingredients for mass transfer intensification, both in terms of optimizing the operation of existing setups and for designing new devices.

中文翻译：

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汽缸固定端不同相界条件下有限旋流的结构。

本文分析了气缸旋转端面产生的涡流的复杂拓扑。通过对圆柱体上端旋流的不同参数进行流动可视化，可以显示具有逆流（气泡状旋涡衰减）的区域演化的一般规律，而与所研究的旋涡流与各种涡旋的接触无关。自由端的液体或气体。该研究首次发现，气泡状破裂区域的出现情况在很大程度上取决于限制工作流体循环的介质特性，但与受涡流限制的涡流动力学有很大不同。 “实心”第二壁-圆柱体的固定端。例如，在轴向涡旋破坏期间，