Description of Fluid Dynamics and Coupled Transports in Models of a Laminar Flow Diffusion Chamber

0398141 - ÚCHP 2014 RIV US eng J - Journal Article
Trávníčková, Tereza - Havlica, Jaromír - Ždímal, Vladimír
Description of Fluid Dynamics and Coupled Transports in Models of a Laminar Flow Diffusion Chamber.
Journal of Chemical Physics. Roč. 139, č. 6 (2013), 064701. ISSN 0021-9606. E-ISSN 1089-7690
R&D Projects: GA ČR(CZ) GAP105/12/0664; GA AV ČR IAA200760905
Institutional support: RVO:67985858
Keywords : homogeneous nucleation rates * mass transfer * n-butanol
Subject RIV: CI - Industrial Chemistry, Chemical Engineering
Impact factor: 3.122, year: 2013

The aim of this study is to assess how much the results on ucleation experiments in a laminar flow diffusion chamber (LFDC) are influenced by the complexity of the model of the transport properties. The effects of the type of fluid dynamic model (the steady state compressible Navier-Stokes system for an ideal gas/parabolic profile approximation) and the contributions of the coupled terms describing the Dufour effects and thermodiffusion on the predicted magnitude of the nucleation maxima and its location were investigated. This study was performed on the model of the homogeneous nucleation of an n-butanol-He vapor mixture in a LFDC. The isothermal dependencies of the nucleation rate on supersaturation were determined at three nucleation temperatures: 265 K, 270 K, and 280 K. For this purpose, the experimental LFDC data measured by A. P. Hyvärinen et al. were reevaluated using transport models at different levels of complexity. Our results indicate that the type of fluid dynamical model affects both the position of the nucleation maxima in the LFDC and the maximum value of the nucleation rate. On the other hand, the Dufour effects and thermodiffusion perceptibly influence only the value of the maximal nucleation rate. Its position changes only marginally.
Permanent Link: http://hdl.handle.net/11104/0225691