Abstract: With the rapid development of industrialization, a large number of toxic residues of PM_2.5 are produced in the daily life. Due to its slow settling velocity and large quantity and surface area, PM_2.5 is a carrier of pollutants and damages the respiratory function of body. It is important to study how to effectively remove PM_2.5 in industrial production and daily life. The filtration performance of fibers with different sizes of Y-shaped and circular section is examined in this study, and the relation of particle retention to smoke speed and particle concentration is analyzed. The influence of density and porosity of fiber assembly on the filtration performance of PM_2.5 is studied. Fiber and fiber assembly are simulated with Euler method and Lagrange method, and the numerical results are in good agreement with experimental data. The results on Y-shaped fiber show that higher linear density of fiber retains less particles at the same smoke speed and concentration, higher particle concentration leads to higher particle retention at the same linear density and speed, and higher speed of smoke gas gives higher particle retention at the same linear density and concentration. The retention with Y-shaped fiber section is better than that with circular section. The results on fiber assembly show that higher linear density of fiber improves the particle retention at the same porosity and larger porosity reduces the retention at the same linear density of fiber. The performance for PM_2.5 filtration is better at linear density of fiber of 0.27 tex and fiber assembly porosity of 0.88.

Key words: fiber, fiber assembly, model, surface, PM_2.5, simulation, filtration performance

摘要： 在日常的生产和生活排放的残留物中存在许多有毒的PM_2.5细颗粒物，对人体呼吸功能损害大，因此研究如何有效去除PM_2.5细颗粒物具有十分重要的意义。对不同尺寸“Y”形截面和圆形截面的单纤维丝对烟气中PM_2.5颗粒物的过滤性能进行实验，分析不同烟气流速和颗粒物浓度对颗粒物截留率的影响，进而研究纤维集合体在不同单丝线密度和孔隙率的条件下对烟气中PM_2.5颗粒物过滤性能的作用。结合Euler法和Lagrange法对上述单纤维丝和纤维集合体实验工况进行数值模拟，将其结果与实验数据进行对比发现实验与数值模拟结果吻合较好。研究结果表明，同一时刻“Y”形截面的单纤维丝比圆形截面单纤维丝对颗粒物截留率更高。对于纤维集合体，单丝线密度为0.27 tex和孔隙率为0.88工况下，纤维集合体对颗粒物PM_2.5的捕集性能最好。

关键词: 单纤维丝, 纤维集合体, 模型, 表面, PM_2.5, 模拟, 过滤性能