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- W4701602 abstract "Publisher Summary This chapter focuses on simple model describing the aerosol particle losses in Nolan–Pollak (N–P) counter. It includes particle coagulation, wall deposition, and sedimentation. Measurements with well defined aerosol support the model calculation. N–P counter is a useful tool for condensation nuclei concentration measurement if the recommended operation parameters are observed. These are 60 seconds “equilibrating” aerosol dwelling time and expansion pressure ratio of 1.21 or slightly higher. During the first 60 seconds, before saturated air expansion, substantial aerosol in homogeneities in the counters sensitive volume are documented. The calculated losses were within 7% larger than those obtained by measurements. The effect of the presence of large soluble particles on the ultmfme particle losses in the N–P counter ought to be investigated in more detail. Preliminary results show that a considerable part of salt particles is activated before the saturated air expansion in the counter is performed. This could explain the greater fine particle losses observed during the first two minutes of particle dwelling in the counter." @default.
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- W4701602 date "1996-01-01" @default.
- W4701602 modified "2023-09-27" @default.
- W4701602 title "Particle losses and interaction in nolan-pollak counter" @default.
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- W4701602 doi "https://doi.org/10.1016/b978-008042030-1/50105-0" @default.
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