Simulation Of Fiber Filter Performance Considering Electric Field Effect

The fiber filter is inexpensive and has high filtration efficiency for aerosol particles,and is the most widely used dust removal method currently.With the rapid development of the economy and the acceleration of the industrialization process,the demand for energy has increased substantially,and the problem of fine particulate matter emissions has become more and more serious.In addition,in the field of biomedical research,once the pathogen is leaked from the laboratory,it may cause the spread of the disease,and aerosol is the most common way of pathogen transmission.This paper simulates the main factors affecting the performance of fiber filters.Firstly,a multi-software coupling method was proposed to establish a three-dimensional random fiber model describing the microstructure of the fiber filter,and the model verification was carried out.Secondly,through the custom development of UDF program,considering interception capture,Brownian diffusion and electrostatic force,the filtration efficiency of aerosol particles is predicted by neglecting the fiber potential and particle charge distribution inhomogeneity.After verification with the experimental data of the literature,the results show that the electric field force is an important factor that can not be ignored when estimating the filtration efficiency of particles in the range of 50～300 nm.In addition,the effects of filtration rate,fiber potential,fiber solid volume fraction,fiber diameter,particle charge-to-mass ratio,fiber orientation angle on the filtration efficiency and pressure drop of the fiber filter were also studied.The experimental data in the comparison is checked.The three-dimensional random fiber model and filtration efficiency prediction model established in this paper will be instructive for HEPA filter design.