Articles | Volume 4, issue 2
Atmos. Chem. Phys., 4, 439–447, 2004
Atmos. Chem. Phys., 4, 439–447, 2004

  17 Mar 2004

17 Mar 2004

Volatile particles formation during PartEmis: a modelling study

X. Vancassel1,*, A. Sorokin2, P. Mirabel1, A. Petzold3, and C. Wilson4 X. Vancassel et al.
  • 1Centre de Géochimie de la Surface, Université Louis Pasteur, Strasbourg, France
  • 2Central Institute for Aviation Motors, Moskow, Russia
  • 3Deutsches Zentrum für Luft- und Raumfahrt, Oberpfaffenhofen, Germany
  • 4QinetiQ, Farnborough, UK
  • *now at: Atmospheric, Oceanic and Planetary Physics, University of Oxford, UK

Abstract. A modelling study of the formation of volatile particles in a combustor exhaust has been carried out in the frame of the PartEmis European project. A kinetic model has been used in order to investigate nucleation efficiency of the H2O-H2SO4 binary mixture in the sampling system. A value for the fraction $varepsilon$ of the fuel sulphur S(IV) converted into S(VI) has been indirectly deduced from comparisons between model results and measurements. In the present study, $varepsilon$ ranges between roughly 2.5% and 6%, depending on the combustor settings and on the value assumed for the parameter describing sulphuric acid wall losses. Soot particles hygroscopicity has also been investigated as their activation is a key parameter for contrail formation. Growth factors of monodisperse particles exposed to high relative humidity (95%) have been calculated and compared with experimental results. The modelling study confirms that the growth factor increases as the soot particle size decreases.

Final-revised paper