Quantitative visualization experiments of hollow cylinders falling through a Newtonian liquid were performed. The Archimedes number was in the range 5 to 10⁵, the length/outer diameter ratio of the cylinders was in the range 2.5–10, and the inner/outer diameter ratio was 0–0.85. The definition of the Archimedes number includes the inner and outer cylinder diameters, and it is shown that cylinders with the same Archimedes number having different diameter ratios behave similarly. Particle-resolved simulations were used to enhance the insight into the fluid flow generated by the settling cylinder. They were also used to assess the flow through a hollow cylinder during settling.

中文翻译：

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空心圆柱体在静止液体中下落的实验与模拟

进行了空心圆柱体穿过牛顿液体的定量可视化实验。阿基米德数的范围为5至10 ⁵，圆柱体的长度/外径比的范围为2.5至10，内/外径比为0至0.85。阿基米德数的定义包括圆柱体的内径和外径，并且表明具有相同阿基米德数但不同直径比的圆柱体的行为相似。粒子解析模拟用于增强对沉降缸产生的流体流动的了解。它们还用于评估沉降过程中通过空心圆柱体的流量。