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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Volume 3, issue 1 | Copyright
Atmos. Meas. Tech., 3, 273-281, 2010
https://doi.org/10.5194/amt-3-273-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.

  25 Feb 2010

25 Feb 2010

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

F. Stratmann1,2, E. Herrmann1, T. Petäjä1, and M. Kulmala1 F. Stratmann et al.
  • 1Department of Physics, P.O. Box 64, 00014 University of Helsinki, Finland
  • 2Leibniz Institute for Tropospheric Research (IfT), Permoserstrasse 15, 04318 Leipzig, Germany

Abstract. 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.

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