发表机构
Friedrich-Alexander-Universität Erlangen-Nürnberg（埃尔朗根-纽伦堡弗里德里希·亚历山大大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过离散元模拟发现螺旋运动可同时提升颗粒管道流的均匀性与输运效率，并提出一种新型螺旋管道设计以实现该效果。
AI 中文摘要
重力驱动的颗粒管道流中的密度波降低了输运效率，并导致局部固相分数产生大幅波动。螺旋壁纹理可抑制这些不稳定性，但代价是降低吞吐量。利用离散元模拟（DEM），我们发现这种均质化与螺旋壁纹理诱导的颗粒螺旋运动相关。通过平均角速度量化该运动，揭示了螺旋运动、流动均质化与输运性能之间的强相关性。受此启发，我们引入一种中心线沿螺旋路径且保持恒定圆形横截面的螺旋管道。该设计比传统螺旋壁纹理产生更强的螺旋运动。对于合适的设计参数，螺旋管道同时增强流动均匀性，并将平均流速提升至超过普通直管。这些结果支持螺旋运动作为在所研究参数范围内同时改善流动均匀性与输运效率的有用诊断和设计变量。
英文摘要
Density waves in gravity-driven granular pipe flow reduce transport efficiency and produce large fluctuations in the local solid fraction. Helical wall textures suppress these instabilities but at the expense of reduced throughput. Using discrete element simulations (DEM), \RefA{we find that this homogenization is associated with} spiral particle motion induced by the helical wall texture. Quantifying this motion by the mean angular velocity reveals a strong correlation between spiral motion, flow homogenization, and transport performance. Motivated by this insight, we introduce a helical pipe whose centerline follows a helical path while maintaining a constant circular cross section. This design generates stronger spiral motion than conventional helical wall textures. For suitable design parameters, the helical pipe simultaneously enhances flow homogeneity and increases the mean flow velocity beyond that of a plain straight pipe. These results support spiral motion as a useful diagnostic and design variable for simultaneously improving flow homogeneity and transport efficiency within the investigated parameter range.
Comments9 pages, 8 figures
