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Diffusional deposition of ultrafine aerosols on nuclepore filters

Diffusionsablagerung von ultrafeinen Aerosolen auf Nuclepore-Filtern
: Gentry, J.W.; Spurny, K.R.; Schoermann, J.


Atmospheric environment 16 (1982), No.1, pp.25-40 : Abb.,Tab.,Lit.
ISSN: 0004-6981
ISSN: 1352-2310
Journal Article
Fraunhofer IUCT ( IME) ()
aerosol; Diffusionsablagerung; filtration

The fractional penetrations of aerosols between 10 and 100 nm through nuclepore filters are measured for four different aerosols. Nuclepore filter pore diameters varied from 2 to 12 μm while superficial facial velocities ranged from 0.8 to 6.6 cm s−1. Qualitatively, differences were observed between aerosols greater than 40 nm and the condensation aerosols with diameters less than 30 nm. For the smaller particles, the aerosols were widely distributed over the filter face while the larger aerosols were concentrated near the rims of the pore. Comparisons between the experimental measurements and theory show that the collection efficiencies are consistently underestimated by theory. For the smaller condensation aerosols, the experiments show nearly uniform deposition over the face of the filter.