The oxidation of graphite powder in flame reaction zones

Bradley, D.; Dixon‐Lewis, G.; Habik, S. El-Din; Mushi, E.M.J.

doi:10.1016/s0082-0784(85)80582-8

Cited by 115 publications

(115 citation statements)

References 38 publications

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“…The collision efficiency of OH is treated as that described by Kennedy et al (1996), who accounted for the variation of the collision efficiency of OH with time by assuming a linear relation between the collision efficiency and a dimensionless distance from the fuel nozzle exit. A collision efficiency of 0.5 for radical O attack on the particles is used in this study (Bradley et al, 1984). All the reaction rate constants, k i ði ¼ 1; .…”

Section: Soot Modelmentioning

confidence: 99%

A Numerical Investigation of Thermal Diffusion Influence on Soot Formation in Ethylene/Air Diffusion Flames

Guo¹,

Liu²,

Smallwood³

et al. 2004

International Journal of Computational Fluid Dynamics

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Thermal diffusion, caused by temperature gradients, tends to draw lighter molecules to warmer regions and to drive heavier molecules to cooler regions of a mixture. The influence of thermal diffusion on soot formation in coflow laminar ethylene/air diffusion flames is numerically investigated in this paper. Detailed reaction mechanisms and complex thermal and transport properties are employed. The fully elliptic governing equations are solved. Radiation heat transfer from the flames is calculated by the discrete-ordinates method coupled to an SNBCK-based wide band model. A simplified two-equation soot model is used. The interactions between soot and gas-phase chemistry are taken into account. The thermal diffusion velocities are calculated according to the thermal diffusion coefficients evaluated based on multicomponent properties.The results show that thermal diffusion does affect soot formation in ethylene/air diffusion flames. Although the effect on soot formation in pure ethylene/air flame is not significant, the influence is enhanced if lighter species, such as helium, are added to the fuel or the air stream. The peak integrated soot volume fraction doubles if thermal diffusion is not taken into account in the simulation of the flame with helium addition to the air stream.

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Section: Soot Modelmentioning

confidence: 99%

A Numerical Investigation of Thermal Diffusion Influence on Soot Formation in Ethylene/Air Diffusion Flames

Guo¹,

Liu²,

Smallwood³

et al. 2004

International Journal of Computational Fluid Dynamics

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show abstract

“…The O radical also contributes to soot oxidation in some regions [22]. Therefore soot oxidation by all these three oxidative agents was taken into account in the present study.…”

Section: Soot Modelmentioning

confidence: 99%

Effects of gas and soot radiation on soot formation in a coflow laminar ethylene diffusion flame

Liu

Guo

Smallwood

et al. 2002

Journal of Quantitative Spectroscopy and Radiative Transfer

130

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“…In some other studies, commercial carbon blacks or graphite particles were introduced and burned in the flames and their "pure" oxidation rates were measured [Bradley et al, 1984;Rybak et al, 1991]. Diesel fuel spray flames in laboratories have been used to simulate combustion in diesel engine combustion chambers so as to investigate diesel soot oxidation [Hiroyasu et al, 1980;Kadota and Henein, 1981].…”

Section: Previous Research Methods On Carbon Oxidationmentioning

confidence: 99%

“…In addition to 02, some other species such as OH, C02, O, H, H2O have also been reported to be carbon oxidants [Bradley et al, 1984;Chelliah, 1996;Fenimore and Jones, 1967;Radcliffe and Appleton, 1971]. …”

Section: Oxidantsmentioning

confidence: 99%

“…The resulting carbon, and soot oxidation models are often in the form of semi-empirical correlations. These semi-empirical models are based on kinetic rate expressions of carbon or soot oxidation and are calibrated using experimental data, such as, the values of the reaction rates of graphite, flame soot, and carbon blacks [Bradley et al, 1984;Chelliah, et al, 1996;Chelliah, 1996;Coelho and Carvalho, 1995;Feugier, 1974;Kennedy, 1997;Khan et al, 1971;Lee et al, 1962;Marcuccilli et al, 1994; Haiwen Song PhD thesis, Brunel University, UK, 2003…”

Section: Soot Oxidation Kinetics and Modellingmentioning

confidence: 99%

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