Numerical modelling of soot formation and oxidation in laminar coflow non-smoking and smoking ethylene diffusion flames

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DOIResolve DOI: http://doi.org/10.1088/1364-7830/7/2/305
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TypeArticle
Journal titleCombustion Theory and Modelling
ISSN1364-7830
1741-3559
Volume7
IssueJune 2
Pages301315; # of pages: 15
Subjectsoot formation; axisymmetric laminar coflow; diffusion flames; ethylene; thermal property; transport property; soot nucleation; Radiation heat transfer; radiation model
AbstractA numerical study of soot formation and oxidation in axisymmetric laminar coflow non-smoking and smoking ethylene diffusion flames was conducted using detailed gas-phase chemistry and complex thermal and transport properties. A modified two-equation soot model was employed to describe soot nucleation, growth and oxidation. Interaction between the gas-phase chemistry and soot chemistry was taken into account. Radiation heat transfer by both soot and radiating gases was calculated using the discrete-ordinates method coupled with a statistical narrow-band correlated- k based band model, and was used to evaluate the simple optically thin approximation. The governing equations in fully elliptic form were solved. The current models in the literature describing soot oxidation by O 2 and OH have to be modified in order to predict the smoking flame. The modified soot oxidation model has only moderate effects on the calculation of the non-smoking flame, but dramatically affects the soot oxidation near the flame tip in the smoking flame. Numerical results of temperature, soot volume fraction and primary soot particle size and number density were compared with experimental data in the literature. Relatively good agreement was found between the prediction and the experimental data. The optically thin approximation radiation model significantly underpredicts temperatures in the upper portion of both flames, seriously affecting the soot prediction.
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Copyright noticeMaterial in this document is covered by the provisions of the Copyright Act, by Canadian laws, policies, regulations and international agreements. Such provisions serve to identify the information source and, in specific instances, to prohibit reproduction of materials without written permission.
LanguageEnglish
AffiliationNRC Institute for Chemical Process and Environmental Technology (ICPET-ITPCE); National Research Council Canada
Access conditionavailable
unlimited
public
Peer reviewedYes
Identifier16883354
NRC number51476
NPARC number4213017
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Record identifier0df0777b-9d02-42e2-a179-e6c5f78c3e90
Record created2009-10-02
Record modified2016-05-09
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