空气过滤器玻纤滤料纤维排布对初始过滤性能的影响
Influence of fiber arrangement on initial filtration performance in glass fibrous air filter
摘要：
应用格子玻尔兹曼方法（LBM）研究了亚高效滤料(F6)中2种不同直径纤维排布方式对过滤效果的影响，寻找最易穿透粒径(MPPS)，比较了这2种排布方式对应的压降与捕集效率，并用解析解对模拟结果进行了验证。结果表明，对于直径为0.10~0.90 μm的颗粒物，模型1（小纤维在后、大纤维在前）的捕集效率比模型2（小纤维在前、大纤维在后）低，最大差值可达17%；当增大纤维的行间距时，捕集效率会增大50%以上；在扩散、惯性和拦截效应下，前方纤维的捕集数量明显高于后方纤维，前一半纤维捕集的颗粒物数量超过总捕集数的83%；F6滤料的MPPS值为0.20~0.40 μm。
Abstract：
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.
Keywords:Lattice Boltzmann method (LBM), air filter, fiber arrangement, filtration performance, capture efficiency, most penetrating particle size (MPPS)