Abstract

In this work, a new method using an external magnetic field enhanced the capture of Fe-based fine particles by magnetic fibers was proposed. The process of Fe-based fine particle capture by magnetic fibers in two structure arrangements (staggered/parallel) was numerically simulated based on a computational fluid dynamics-discrete phase model (CFD-DPM) method. Different magnetic fields could be formed by adding uniform magnetic fields along with the X-, Y-, and Z-axes were added to the domain where the magnetic fibers were located. The movement trajectories and filtration efficiencies in two structure arrangements under different magnetic fields were compared. The results showed that when v = 0.1 m/s, and 0.5 µm ≤ d_p ≤ 2.5 µm, the results were relatively stable when the external magnetic field was along the X-, and Y-axes, and the filtration efficiency of the staggered structure was higher than that of the parallel structure. The results fluctuated greatly when the external magnetic field was along the Z-axis. Within the same fibrous structure arrangement, when the direction of the uniform magnetic field was the same as the direction of the face velocity ($\overrightarrow{H}$//$\overrightarrow{v}$⊥${\overrightarrow{l}}_{\mathit{fiber}}$), the performance of Fe-based fine particle capture by the magnetic fibers was the best.

摘要

在这项工作中，提出了一种利用外部磁场增强磁性纤维对铁基细颗粒的捕获的新方法。基于计算流体动力学-离散相模型（CFD-DPM）方法，对两种结构排列（交错/平行）的磁性纤维捕获铁基细颗粒的过程进行了数值模拟。通过添加均匀磁场可以形成不同的磁场，同时将X轴、Y轴和Z轴添加到磁性纤维所在的域中。比较了两种结构排列在不同磁场下的运动轨迹和过滤效率。结果表明，当v  = 0.1 m/s，且 0.5 µm ≤ d_p ≤ 2.5 µm，外磁场沿X-、Y-轴方向比较稳定，且交错结构的过滤效率高于平行结构。当外部磁场沿Z轴方向时，结果波动很大。在相同的纤维结构排列内，当均匀磁场方向与面速度方向相同时（$\overrightarrow{H}$//$\overrightarrow{v}$⊥${\overrightarrow{l}}_{\mathit{纤维}}$），磁性纤维对铁基细颗粒的捕获性能最好。