Comparison of the Transport Models of a Laminar Flow Diffusion Chamber

0394769 - ÚCHP 2014 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
Trávníčková, Tereza - Havlica, Jaromír - Ždímal, Vladimír
Comparison of the Transport Models of a Laminar Flow Diffusion Chamber.
AIP Conference Proceedings, Volume 1527. Melville, New York: AIP Publishing, 2013 - (DeMott, P.; O'Dowd, C.), s. 79-82. ISBN 978-0-7354-1152-4. ISSN 0094-243X.
[International Conference on Nucleation and Atmospheric Aerosols /19./. Fort Collins, Colorado (US), 23.06.2013-28.06.2013]
Grant CEP: GA AV ČR IAA200760905
Institucionální podpora: RVO:67985858
Klíčová slova: nucleation * mathematical modeling * LFDC
Kód oboru RIV: BJ - Termodynamika
http://proceedings.aip.org/resource/2/apcpcs/1527/1?isAuthorized=no

The aim of this work is to show how the complexity of the modeling of the transport processes affects the results of the nucleation experiments in the Laminar Flow Diffusion Chamber (LFDC). For this purpose, data measured by Hyvärinen et al. [1] were recalculated using models at different levels of complexity. We focused on the influence of hydrodynamics (Navier-Stokes equations or parabolic profile assumption) and coupled terms (Dufour effect and thermodiffusion) on the results. We found that the choice of hydrodynamic model affects both the position of nucleation maxima in the LFDC and the maximum of the nucleation rate. On the other hand, the presence of coupled terms in the model significantly affects only the peak value of the nucleation rate. In order to compare the results obtained by different models, we present a method quantifying relative uncertainty in the determination of the nucleation rate. The prediction of each model was compared to the full model with the Navier-Stokes equations and both coupled terms. The comparison shows that an inappropriate choice of model could lead to serious deviations that may reach several hundred percent in a given case.
Trvalý link: http://hdl.handle.net/11104/0222950