With the rapid development of industrialization

a large number of toxic residues of PM2.5 are produced in the daily life. Due to its slow settling velocity and large quantity and surface area

PM2.5 is a carrier of pollutants and damages the respiratory function of body. It is important to study how to effectively remove PM2.5 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 PM2.5 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 PM2.5 filtration is better at linear density of fiber of 0.27 tex and fiber assembly porosity of 0.88.