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• W2042457108 abstract "Abstract Quantitative OH · concentrations and primary soot particle sizes have been determined in the soot oxidation regions of axisymmetric diffusion flames burning methane, methane/butane, and methane/1-butene in air at atmospheric pressure. The total carbon flow rate was held constant in these flames while the maximum amount of soot varied by a factor of seven along the centerline. Laser-induced fluorescence measurements of OH · were placed on an absolute basis by calibration against earlier absorption results. The primary size measurements of the soot particles were made using thermophoretic sampling and transmission electron microscopy. OH · concentrations are greatly reduced in the presence of soot particles. Whereas large super-equilibrium ratios are observed in the high-temperature reaction zones in the absence of soot, the OH · concentrations approach equilibrium values when the soot loading is high. The diminished OH · concentrations are found to arise from reactions with the soot particles and only to a minor degree from lower temperatures due to soot radiation losses. Analysis of the soot oxidation rates computed from the primary particle size profiles as a function of time along the flame centerlines shows that OH · is the dominant oxidizer of soot, with O2 making only a small contribution. Higher collision efficiencies of OH · reactions with soot particles are found for the flames containing larger soot concentrations at lower temperatures. A comparison of the soot and CO oxidation rates shows that although CO is inherently more reactive than soot, the soot successfully competes with CO for OH · and hence suppresses CO oxidation for large soot concentrations." @default.
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• W2042457108 date "1994-05-01" @default.
• W2042457108 modified "2023-10-16" @default.
• W2042457108 title "The oxidation of soot and carbon monoxide in hydrocarbon diffusion flames" @default.
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• W2042457108 doi "https://doi.org/10.1016/0010-2180(94)90001-9" @default.
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