转鼓中部分饱和颗粒流：内聚力的作用
Partially Saturated Granular Flow in a Rotating Drum: The Role of Cohesion
AI总结：
本研究通过实验与DEM模拟探究转鼓内部分饱和颗粒流，分析内聚力和转速对滚动/级联流模式的影响，提出无量纲数CE表征多因素作用，并揭示团簇尺寸分布的幂律规律及内聚力对团簇形成的促进作用。
摘要：
部分饱和颗粒流广泛存在于滑坡、矿物处理、食品加工等各类自然与工业过程中。我们开展实验并采用离散元法（Discrete Element Method, DEM），研究部分饱和条件下转鼓内的颗粒流行为，重点考察滚动流与级联流模式下，内聚力（表面张力）强度和转速变化对流动的影响。研究发现，随着表面张力增大，滚动模式下的流动坡面更陡，相应需要更高的转速才能转变为级联流；流动区深度随内聚力增大而增加，但内聚力较高时，流动深度对内聚力的敏感度会降低。我们提出了一个无量纲数CE，用以表征旋转、重力与内聚力对动态休止角和流动深度的共同作用。此外，我们提取了流动中团簇形成的统计信息，发现团簇尺寸分布与其出现概率之间存在幂律关系，表明更强的内聚力会促进更大团簇的形成，并讨论了内聚力如何通过团簇形成来影响流动特性。
英文摘要：
Partially saturated granular flows are common in various natural and industrial processes, such as landslides, mineral handling, and food processing. We conduct experiments and apply the Discrete Element Method (DEM) to study granular flows in rotating drums under partially saturated conditions. We focus on varying the strength of cohesion (surface tension) and rotation rate within the modes of rolling flow and cascading flow. With an increase in surface tension, a rolling mode can possess a steeper slope and correspondingly needs a higher rotation rate to transition to a cascading. The depth of the flowing region increases with increasing cohesion, while the sensitivity is reduced for cases of high cohesion. We propose a dimensionless number CE that captures the combined effects of rotation, gravity and cohesion on the dynamic angle of repose and flow depth. In addition, we extract statistical information on the formation of clusters within the flow. We find a power law relation between the cluster size distribution and its probability, which indicates that stronger cohesion can promote the formation of larger clusters, and we discuss how cohesion impact on flows manifested by cluster formation.
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