Abstract
Diffusional filtration efficiencies of polydispersed particles by fibrous and granular filters were calculated in two different ways. One was an approximation method employing the integration of lognormal function moments and the other utilised direct numerical integration of the penetration equation. The results show that the filtration efficiency for a polydisperse aerosol along the length of the filter bed column initially increases at a higher rate than that of a monodisperse aerosol, but later the rate is gradually retarded. It is noted that all the efficiency curves cross one another in the region where the filtration efficiency is approximately 0.6. Increase in the mean size and decrease in the geometric standard deviation of the particle size distribution due to filtration by Brownian diffusion are also given. The results were compared with available experimental data and satisfactory agreements obtained.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
