When flowing through narrow channels or constrictions, many-body systems exhibit various flowing patterns, yet they can also get stuck. In many of these systems, the flowing elements remain as individuals (they do not aggregate or merge), sharing strong analogies among each other. This is the case for systems as contrasting as grains in a silo and pedestrians passing through tight spaces. Interestingly, when these entities flow within a fluid medium, numerous similarities persist. However, the fluid dynamics aspects of such clogging events, such as interstitial flow, liquid pressure, and hydrodynamic interactions, has only recently begun to be explored. In this review, we describe parallels with dry granular clogging and extensively analyze phenomena emerging when particles coexist with fluid in the system. We discuss the influence of diverse flow drive, particle propulsion mechanisms, and particle characteristics, and we conclude with examples from nature.

中文翻译：

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非粘性悬浮液流堵塞


当流经狭窄的通道或收缩时，多体系统表现出各种流动模式，但它们也可能卡住。在许多这样的系统中，流动的元素仍然是个体（它们不会聚合或合并），彼此之间有很强的类比。系统就是这种情况，就像筒仓中的谷物和穿过狭小空间的行人一样。有趣的是，当这些实体在流体介质中流动时，许多相似之处仍然存在。然而，这种堵塞事件的流体动力学方面，如间隙流、液体压力和流体动力学相互作用，直到最近才开始被探索。在这篇综述中，我们描述了与干燥颗粒堵塞的相似之处，并广泛分析了当颗粒与系统中的流体共存时出现的现象。我们讨论了各种流动驱动、粒子推进机制和粒子特性的影响，并以自然界的例子作为结论。