Fractal Characteristics of Aerosols Deposition in the Fiber Surface

To study the effects of particle motion mechanism and size distribution on fractal dimension of dust cake structure,the process of aerosol particles deposition in fibrous filtration medium was simulated on basis of Diffusion-Limited Aggregation（DLA）improving model.In this study,effects of inertia movement and diffusion movement on particles deposition would be considered.In the mean while,ratio of inertia movement to diffusion movement was defined as Pe number.The results show that surface curve of dust cake becomes irregular with Pe reducing and fractal dimension of dust cake surface increased with Pe increasing.The more greater particles dispersion,the more greater dust cake porosity,the more uneven the distribution.The porosity,formed by Polydisperse dust particles,is less than that formed by monodisperse particles.Stronger particle diffusion movement,more uniform the dust cakes was.