Modelling Ag-particle activation and growth in a TSI WCPC model 3785

In this work, we modelled activation and growth of silver particles in the water-operated TSI model 3785 water condensation particle counter (WCPC). Our objective was to investigate theoretically how various effects influence the counting efficiency of this CPC. Coupled fluid and particle dynamic pr...

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Bibliographic Details
Published in:Atmospheric measurement techniques 2010-01, Vol.3 (1), p.273-281
Main Authors: Stratmann, F., Herrmann, E., Petäjä, T., Kulmala, M.
Format: Article
Language:English
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Summary:In this work, we modelled activation and growth of silver particles in the water-operated TSI model 3785 water condensation particle counter (WCPC). Our objective was to investigate theoretically how various effects influence the counting efficiency of this CPC. Coupled fluid and particle dynamic processes were modelled with the computational fluid dynamics (CFD) code FLUENT in combination with the Fine Particle Model (FPM) to obtain profiles of temperature, vapour concentration, nucleation rate, and particle size. We found that the counting efficiency of the TSI 3785 for small particles might be affected by the presence of larger particles. Moreover, homogeneous nucleation processes can significantly influence counting efficiency.
ISSN:1867-8548
1867-1381
1867-8548
DOI:10.5194/amt-3-273-2010