Volatile particles formation during PartEmis: a modelling study X. Vancassel1,*, A. Sorokin2, P. Mirabel1, A. Petzold3, and C. Wilson4 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 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, 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.
Citation: Vancassel, X., Sorokin, A., Mirabel, P., Petzold, A., and Wilson, C.: Volatile particles formation during PartEmis: a modelling study, Atmos. Chem. Phys., 4, 439-447, doi:10.5194/acp-4-439-2004, 2004.