Deposition of Aerosol Particles onto the Rough Surfaces of Ventilation Ducts

Abstract

In this article, a previously developed model that was set to describe the deposition of particles onto the internal smooth surfaces of small containers is modified to account for rough surfaces. This is basically achieved by modifying the limits of the boundary layer that are used for calculating the deposition velocities. Deposition inside a ventilation duct is taken as an example for performing the applications. The deposition velocities onto all surfaces with different orientations are calculated in comparisons to the experimental data. Different friction velocities are considered, where the shifts in the lower limit of the boundary layer are put in relation to the friction velocities. The presented model has the merit of being able to predict the shift in the boundary layer limit for any given friction velocity, which is a very important parameter that is required for describing the deposition and penetration of aerosol particles through ventilation ducts with rough surfaces.