Clustering in gas-fluidized riser flows of flexible fibers
Clustering in gas-fluidized riser flows of flexible fibers
复制标题
柔性纤维气体流化立管流的聚集
DOI：
10.1002/aic.18024
复制
发表时间：
2023
期刊：
影响因子：
3.7
通讯作者：
Yu Guo
中科院分区：
文献类型：
--
作者：
D;an Xu;Bo Wang;Zhaosheng Yu;Yu Guo
使用离散元法和计算流体动力学的混合方法研究立管流中柔性纤维的聚集。与球形颗粒不同，柔性纤维具有细长的形状，可发生显着的变形，并通过快速纤维变形耗散动能。目前的研究表明，这些独特的特征对纤维的簇特征有显着影响。较大的纤维长径比导致附聚物的数量和尺寸较大，同时由于堆积密度降低而导致更稀的簇，从而导致固体分布的不均匀性降低。随着纤维变得更加柔韧，异质性增加，并且获得更密集的簇。对于具有较大长径比的纤维，观察到纤维柔韧性对聚集的更显着影响。通过快速纤维变形增加的能量耗散通过增加附聚物的数量和尺寸来增强聚集。
Clustering of flexible fibers in riser flows is investigated using a hybrid approach of.Discrete Element Method and Computational Fluid Dynamics. Unlike spherical particles,.the flexible fibers possess elongated shape, undergo significant deformation,.and dissipate kinetic energies through rapid fiber deformation. The present studies.show that these distinct features have significant impacts on the cluster characteristics.of the fibers. A larger fiber aspect ratio leads to larger number and sizes of.agglomerates, while it causes a reduction in heterogeneity of solids distribution due.to the more dilute clusters with reduced packing densities. As the fibers become.more flexible, the heterogeneity increases, and denser clusters are obtained. More.significant effects of the fiber flexibility on the clustering are observed for the fibers.with larger aspect ratios. The increased energy dissipation through the rapid fiber.deformation enhances the clustering by augmenting the number and size of the.agglomerates.