Implementation of an advanced fixed sectional aerosol dynamics model with soot aggregate formation in a laminar methane/air coflow diffusion flame

Abstract

/npsi/ctrl?action=rtdoc&an=3535848&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=3535848&lang=frAccess and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1080/13647830801966153Combustion Theory and Modelling, 12, 4, pp. 621-641, 2008 Implementation of an advanced fixed sectional aerosol dynamics model with soot aggregate formation in a laminar methane/air coflow diffusion flame Zhang, Q.; Guo, Hongsheng; Liu, Fengshan; Smallwood, Gregory J.; Thomson, M.J. Full terms and conditions of use: http://www.informaworld.com/terms-and-conditions-of-access.pdf This article may be used for research, teaching and private study purposes. Any substantial or systematic reproduction, re-distribution, re-selling, loan or sub-licensing, systematic supply or distribution in any form to anyone is expressly forbidden. PLEASE SCROLL DOWN FOR ARTICLEThe publisher does not give any warranty express or implied or make any representation that the contents will be complete or accurate or up to date. The accuracy of any instructions, formulae and drug doses should be independently verified with primary sources. The publisher shall not be liable for any loss, actions, claims, proceedings, demand or costs or damages whatsoever or howsoever caused arising directly or indirectly in connection with or arising out of the use of this material. Vol. 12, No. 4, August 2008, 621-641 An advanced fixed sectional aerosol dynamics model describing the evolution of soot particles under simultaneous nucleation, coagulation, surface growth and oxidation processes is successfully implemented to model soot formation in a two-dimensional laminar axisymmetric coflow methane/air diffusion flame. This fixed sectional model takes into account soot aggregate formation and is able to provide soot aggregate and primary particle size distributions. Soot nucleation, surface growth and oxidation steps are based on the model of Fairweather et al. Soot equations are solved simultaneously to ensure convergence. The numerically calculated flame temperature, species concentrations and soot volume fraction are in good agreement with the experimental data in the literature. The structures of soot aggregates are determined by the nucleation, coagulation, surface growth and oxidation processes. The result of the soot aggregate size distribution function shows that the aggregate number density is dominated by small aggregates while the a...

A numerical study of soot aggregate formation in a laminar coflow diffusion flame

“…As in previous studies [12,23,28], the finite volume method was used to discretize the governing equations. SIMPLE algorithm with the staggered mesh was used to handle the pressure and velocity coupling [29].…”

“…It was checked that further refinement of the mesh had negligible effect on the results. To speed up the calculations, the whole computational domain was divided uniformly in the zdirection into 16 sub-domains and each sub-domain was assigned to one CPU for the calculation [14,28]. As in [12], a parabolic profile was assumed for the inlet fuel velocity and a boundary layer profile was assumed for the air stream velocity.…”

Effects of gravity and pressure on laminar coflow methane–air diffusion flames at pressures from 1 to 60 atmospheres

“…Most numerical studies involving burner-stabilized laminar coflow diffusion flames employ fixed-temperature boundary conditions and assume that the tube temperature is equal to that of the cold reactants [21,63,75]. These studies also neglect any increase in fuel or oxidizer temperature upstream of the burner exit plane.…”

“…Soot models consist of two main components: a mathematical representation of the aerosol dynamics and a kinetic mechanism to describe gas-particle conversion. To model aerosol dynamics, researchers have either assumed a mono-disperse particle size distribution (PSD) [21,[54][55][56], called the two-equation model, or applied more advanced moment [57][58][59][60] or sectional [7,[61][62][63] representations. Sectional models are generally regarded as the most accurate, although they are computationally demanding, while moment models seem to provide the best balance between cost and accuracy [64].…”

Modeling of Oxidation-Driven Soot Aggregate Fragmentation in a Laminar Coflow Diffusion Flame

“…It has been checked that further refinement of the mesh has negligible effect on the results. To speed up the calculations, the whole computational domain was divided uniformly in the axial direction into 16 subdomains, and each subdomain was assigned to a computing process for the calculation (Zhang et al, 2008;Zhang et al, 2009a). As in Liu et al (2003), a parabolic profile was assumed for SOOT AGGREGATE FRAGMENTATION MODELING 499 the inlet fuel velocity and a boundary layer profile was assumed for the air stream velocity.…”