Penetration of nanometer-sized aerosol particles through the annular space between two con centric cylinders has been calculated theoretically by two alternative approaches. In the first approach, penetration was calculated from the numerical solution of the diffusion-convection equation. In the second, penetration was calculated from a MonteCarlo simulation of particle trajectories. Values of particle penetration obtained from the two methods were in quite good agreement between each other. Practical expressions correlating penetration with the di mensionless particle diffusion coefficient and the coaxial cylinders radii ratio were obtained for two specific forms of the flow velocity profile (uniform velocity and fully developed velocity profile).

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