Filtration of ultrafine chain aggregate aerosols by nuclepore filters

Four Nuclepore filters with a pore size of 3.0, 5.0, 8.0 and 10.0 μm were tested at flow velocity in the range 4.2–25.0 cm/s. Ultrafine chain aggregates were used as a model fibrous aerosol. Experiments were carried out under the condition that the collection mechanisms by diffusion and inertia were not significant. Results indicated that the collection efficiency decreased with flow velocity. The effects of dynamic shape slip correction and orientation distribution of the fibrous particles on collection mechanisms—diffusion inertia impaction and interception—are discussed.