Influence of fiber arrangement on initial filtration performance in glass fibrous air filter

 Studies the influence of two kinds of arrangement of fibers with different diameters on the filtration efficiency of sub-HEPA filter (F6) using Lattice Boltzmann method (LBM). Determines the most penetrating particle size(MPPS). Compares the pressure drop and capture efficiency of the two kinds of arrangement.Validates the simulation results with analytic solutions.The results show that the capture efficiency of model one, i.e. large fibers are positioned upstream with small fibers downstream, is lower than that of model two, i.e. small fibers are positioned upstream with large fibers downstream. The largest deviation between these two schemes can reach 17% for particles with diameter between 0.10 and 0.90 μm. With the increase of line gap distance, the capture efficiency can be increased by more than 50%. With the diffusion, inertia and interception mechanisms, the captured amount of aerosol particles by the anterior fibers is significantly larger than that by the rear, and the number of the captured particles by the anterior fibers can reach 83% of the total number. MPPS of F6 filter is between 0.20 μm and 0.40 μm.