Modeling of graphite oxidation in a stagnation-point flow field using detailed homogeneous and semiglobal heterogeneous mechanisms with comparisons to experiments

Chelliah, Harsha K.; Makino, Atsushi; Kato, I.; Araki, Nobuyuki; Law, Chung K.

doi:10.1016/0010-2180(95)00151-4

Cited by 78 publications

(49 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our choice of the global gas-phase chemistry requires a further comment, because nowadays it is common to use detailed chemistry in the gas phase. Nonetheless, because of its simplicity, it is decided to use the global gas-phase chemistry, after having examined the fact that the formulation with detailed chemistry (Chelliah, et al, 1996) offers nearly the same results as those with global gas-phase chemistry. Figure 3(b) shows the temperature profiles for the airflow of 200 s -1 .…”

Section: Mass Transfer Related To Heterogeneous Combustion Of Solid Cmentioning

confidence: 99%

Mass Transfer Related to Heterogeneous Combustion of Solid Carbon in the Forward Stagnation Region - Part 1 - Combustion Rate and Flame Structure

Makino¹

2011

Mass Transfer in Chemical Engineering Processes

View full text Add to dashboard Cite

Section: Mass Transfer Related To Heterogeneous Combustion Of Solid Cmentioning

confidence: 99%

Mass Transfer Related to Heterogeneous Combustion of Solid Carbon in the Forward Stagnation Region - Part 1 - Combustion Rate and Flame Structure

Makino¹

2011

Mass Transfer in Chemical Engineering Processes

View full text Add to dashboard Cite

“…see [31]. However, at the same time it is a well-known fact that global reaction rates are often only valid in a certain range of conditions and should be used very cautiously, see [32,33]. Finally, it should be noticed that the H 2 -oxidation reaction (H 2 + O 2 ) was not taken into account in this work.…”

Section: Problem Formulationmentioning

confidence: 99%

From Detailed Description of Chemical Reacting Carbon Particles to Subgrid Models for CFD

Schulze

Kestel

Nikrityuk

et al. 2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

View full text Add to dashboard Cite

. Trois réactions hétérogènes sont utilisées, ainsi que deux réactions semi-globales homogènes, à savoir l'oxydation du monoxyde de carbone et la réaction du gaz à l'eau. Les particularités distinctives du modèle de sous-maille se trouvent dans la prise en compte de l'influence des réactions homogènes sur les caractéristiques intégrales telles que les taux de combustion du carbone et la température de la particule. Le sous-modèle a été validé en comparant ses résultats avec un modèle complet basé sur la CFD résolvant les questions de flux volumique et de couche limite autour de la particule. Dans ce modèle, les équations de Navier-Stokes couplées aux équations de conservation de l'énergie et des espèces ont été utilisées pour résoudre le problème au moyen de l'approche en état pseudo-stationnaire. À la surface de la particule, l'équilibre de la masse, de l'énergie et de la concentration des espèces a été appliqué, y compris l'effet de l'écou-lement de Stefan et l'effet de la perte de chaleur due aux rayonnements à la surface de la particule. Une bonne adéquation a été atteinte entre le sous-modèle et le modèle basé sur la CFD. En outre, le modèle basé sur la CFD a été comparé aux données expérimentales publiées dans la littérature (Makino et al. (2003) Combust. Flame 132, 743-753). Une bonne concordance a été atteinte entre les données prédites numériquement et celles obtenues expérimentalement pour les conditions d'entrée correspondant au régime contrôlé par la cinétique. La divergence maximale (10 %) entre les expériences et les résultats numériques a été observée dans le régime contrôlé par la diffusion. Enfin, nous discutons de l'influence du nombre de Reynolds, de la fraction massique d'O 2 ambiant et de la température ambiante sur le comportement de la particule de charbon. Abstract -From Detailed Description of Chemical Reacting Carbon Particles to Subgrid Models for CFD -This work is devoted to the development and validation of a sub-model for the partial oxidation of a spherical char particle moving in an air

show abstract

“…The oxidation of carbon has been extensively studied because of the interest in understanding coal combustion (Makino and Law, 1990;Makino, 1990;Makino, et al,1994;Chelliah, 1996;Chelliah et al, 1996;Chelliah and Miller, 1997;Makino et al, 1998;Bews et al, 2001). For zonal model applications a single Arrhenius expression is a viable approach for the oxidation rate of graphite, with the reaction order with respect to oxygen varying from zero at low temperatures (~400 K) to unity at high temperatures (~ 2500 K), with ½ suggested at 1000 K (Backreedy et al, 2001).…”

Section: Intrinsic Graphite Oxidation Ratementioning

confidence: 99%

Graphite oxidation modeling for application in MELCOR.

Gelbard¹

2009

View full text Add to dashboard Cite

The Arrhenius parameters for graphite oxidation in air are reviewed and compared. One-dimensional models of graphite oxidation coupled with mass transfer of oxidant are presented in dimensionless form for rectangular and spherical geometries. A single dimensionless group is shown to encapsulate the coupled phenomena, and is used to determine the effective reaction rate when mass transfer can impede the oxidation process. For integer reactionorder kinetics, analytical expressions are presented for the effective reaction rate. For noninteger reaction orders, a numerical solution is developed and compared to data for oxidation of a graphite sphere in air. Very good agreement is obtained with the data without any adjustable parameters. An analytical model for surface burn-off is also presented, and results from the model are within an order of magnitude of the measurements of burn-off in air and in steam.

show abstract

Modeling of graphite oxidation in a stagnation-point flow field using detailed homogeneous and semiglobal heterogeneous mechanisms with comparisons to experiments

Cited by 78 publications

References 15 publications

Mass Transfer Related to Heterogeneous Combustion of Solid Carbon in the Forward Stagnation Region - Part 1 - Combustion Rate and Flame Structure

Mass Transfer Related to Heterogeneous Combustion of Solid Carbon in the Forward Stagnation Region - Part 1 - Combustion Rate and Flame Structure

From Detailed Description of Chemical Reacting Carbon Particles to Subgrid Models for CFD

Graphite oxidation modeling for application in MELCOR.

Contact Info

Product

Resources

About