Growth of soot particles in counterflow diffusion flames of ethylene

Hwang, Jeongjae; Chung, Suk Ho

doi:10.1016/s0010-2180(00)00234-0

Cited by 101 publications

(71 citation statements)

References 11 publications

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“…Simultaneous measurement has been reported in the literature for co-flowing diffusion flames (13). For sooting opposed flow flames, peak soot concentration typically occurs near the stagnation plane, in fuel rich regions at temperatures slightly lower than peak combustion temperatures (14). For opposed flow diffusion flames in which the stagnation plane is fuel rich (e.g., the flame reported here), the flame occurs at the location where fuel and oxidizer are close to stoichiometric combustion proportions.…”

Section: Introductionsupporting

confidence: 66%

“…The bulk of the reactive oxygen (as CH 2 OH) is stepwise converted to HCO, which then reacts with propargyl to yield CO and C 3 H 4 , which is then nearquantitatively reconverted to propargyl. The increase in other soot precursors (6) predicted by the calculation may be ascribed to introduction of methyl radical (reaction 13) into a relatively low temperature hydrocarbon/acetylene bath (14).…”

Section: A1 Formationmentioning

confidence: 87%

“…The broadening of the OH region and of the temperature profile moves the flame region (i.e., region of appreciable flame radical concentration and high temperature) closer to the stagnation plane, and therefore closer to the region of maximum soot concentration, thereby increasing the rate of soot oxidation (see figures 8 and 9). Introduction of ethanol to the air stream moves the flame from a soot formation type towards a soot formation/oxidation type, in which soot particles must travel a shorter distance into the oxidation region (14). As more ethanol vapor is added to the air stream, the flame begins transition to a multiple flame structure due to partial premixing as has been studied with other fuel-rich-oxidizer premixed flames (28).…”

Section: Oxidizer Side Addition Of Ethanolmentioning

confidence: 99%

“…Reaction 1 shows that for fuel (C 2 H 4 ) and oxidizer (air) flow rates that are approximately equal, in an opposed flow burner (our conditions), assuming gases with similar momenta (our conditions), the gas mixture at the stagnation plane will be fuel rich (14). The stagnation plane is conceptually shown in figure 1.…”

Section: Introductionmentioning

confidence: 94%

See 3 more Smart Citations

Experimental and computational studies of oxidizer and fuel side addition of ethanol to opposed flow air/ethylene flames

McNesby

Miziolek

Nguyen

et al. 2005

Combustion and Flame

105

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Section: Introductionsupporting

confidence: 66%

Section: A1 Formationmentioning

confidence: 87%

Section: Oxidizer Side Addition Of Ethanolmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

See 2 more Smart Citations

Experimental and computational studies of oxidizer and fuel side addition of ethanol to opposed flow air/ethylene flames

McNesby

Miziolek

Nguyen

et al. 2005

Combustion and Flame

105

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“…In this case, due to the absence of oxygen the oxidation rate is low and is only due to the presence of OH [38].…”

Section: Oxidationmentioning

confidence: 97%

A computational study of ethylene–air sooting flames: Effects of large polycyclic aromatic hydrocarbons

Selvaraj

Arias

Lee

et al. 2016

Combustion and Flame

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An updated reduced gas-phase kinetic mechanism was developed and integrated with aerosol models to predict soot formation characteristics in ethylene nonpremixed and premixed flames. A primary objective is to investigate the sensitivity of the soot formation to various chemical pathways for large polycyclic aromatic hydrocarbons (PAH). The gas-phase chemical mechanism adopted the KAUST-Aramco PAH Mech 1.0, which utilized the AramcoMech 1.3 for gas-phase reactions validated for up to C2 fuels. In addition, PAH species up to coronene (C 24 H 12 or A7) were included to describe the detailed formation pathways of soot precursors. In this study, the detailed chemical mechanism was reduced from 397 to 99 species using directed relation graph with expert knowledge (DRG-X) and sensitivity analysis. The method of moments with interpolative closure (MOMIC) was employed for the soot aerosol model. Counterflow nonpremixed flames at low strain rate sooting conditions were considered, for which the sensitivity of soot formation characteristics to different nucleation pathways were investigated. Premixed flame experiment data at different equivalence ratios were also used for validation. The findings show that higher PAH concentrations result in a higher soot nucleation rate, and that the total soot volume and average size of the particles are predicted in good agreement with experimental results. Subsequently, the effects of different pathways, with respect to pyrene-or coronene-based nucleation models, on the net soot formation rate were analyzed. It was found that the nucleation processes (i.e., soot inception) are sensitive to the choice of PAH precursors, and consideration of higher PAH species beyond pyrene is critical for accurate prediction of the overall soot formation.

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Antagonistic Functionalized Nucleation and Oxidative Degradation in Combustive Formation of Pyrene‐Based Clusters Mediated by Triplet O and O₂: Theoretical Study

Maranzana

Tonachini

2015

ChemPhysChem

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Abstract.Polycyclic aromatic hydrocarbons (PAHs) and carbonaceous nanoparticles can be oxidized right from their inception and all through their growth. Oxidation can promote their degradation too. This modelistic density functional theory (DFT) study explores in a descriptive manner if oxidation can mediate the earliest nucleation stages ("functionalized nucleation"), though contrasted by mass declension triggered by oxidation itself. An initial O (

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Growth of soot particles in counterflow diffusion flames of ethylene

Cited by 101 publications

References 11 publications

Experimental and computational studies of oxidizer and fuel side addition of ethanol to opposed flow air/ethylene flames

Experimental and computational studies of oxidizer and fuel side addition of ethanol to opposed flow air/ethylene flames

A computational study of ethylene–air sooting flames: Effects of large polycyclic aromatic hydrocarbons

Antagonistic Functionalized Nucleation and Oxidative Degradation in Combustive Formation of Pyrene‐Based Clusters Mediated by Triplet O and O₂: Theoretical Study

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Growth of soot particles in counterflow diffusion flames of ethylene

Cited by 101 publications

References 11 publications

Experimental and computational studies of oxidizer and fuel side addition of ethanol to opposed flow air/ethylene flames

Experimental and computational studies of oxidizer and fuel side addition of ethanol to opposed flow air/ethylene flames

A computational study of ethylene–air sooting flames: Effects of large polycyclic aromatic hydrocarbons

Antagonistic Functionalized Nucleation and Oxidative Degradation in Combustive Formation of Pyrene‐Based Clusters Mediated by Triplet O and O2: Theoretical Study

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Antagonistic Functionalized Nucleation and Oxidative Degradation in Combustive Formation of Pyrene‐Based Clusters Mediated by Triplet O and O₂: Theoretical Study