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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 ≤  dp  ≤ 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 (//⊥), the performance of Fe-based fine particle capture by the magnetic fibers was the best.

Study on external magnetic field improving the capture of Fe-based fine particles by magnetic fibers with different arrangement structures