This experimental study reveals a spectacular and important phenomenon—double vortex breakdown—in a swirling flow of two immiscible fluids where vortex breakdown bubbles evolve simultaneously in both fluids. The rotating lid drives the steady axisymmetric motion in a sealed vertical cylindrical container whose other walls are stationary. As the rotation intensifies, topological metamorphoses occur, resulting in a multicellular flow. Two new circulation cells (vortex breakdown bubbles) simultaneously develop near the centers of both fluids while the flow remains steady and axisymmetric. Such a pattern can help provide fine, gentle, and nonintrusive mixing in chemical and biological reactors.

中文翻译：

---

两流体受限流中的双涡流击穿

这项实验研究揭示了一种壮观而重要的现象——双涡流击穿——在两种不混溶流体的旋流中，涡流击穿气泡在两种流体中同时演化。旋转的盖子在其他壁静止的密封立式圆柱形容器中驱动稳定的轴对称运动。随着旋转加剧，发生拓扑变形，导致多细胞流动。在流动保持稳定和轴对称的同时，两个新的循环单元（涡流击穿气泡）在两种流体的中心附近同时形成。这种模式有助于在化学和生物反应器中提供精细、温和且非侵入性的混合。