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Shock Tube Study of Dimethylamine Oxidation
Author(s) -
Li Sijie,
Davidson David F.,
Hanson Ronald K.
Publication year - 2015
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.20888
Subject(s) - shock tube , dimethylamine , chemistry , stoichiometry , reaction rate constant , analytical chemistry (journal) , argon , ignition system , dimethyl ether , thermodynamics , shock wave , kinetics , organic chemistry , methanol , physics , quantum mechanics
ABSTRACT Dimethylamine (DMA) ignition delay times and OH time histories during the oxidation process were investigated behind reflected shock waves. The ignition delay time measurements cover the temperature range of 1181–1498 K, with pressures near 0.9, 1.5, and 2.8 atm, and equivalence ratios of 0.5, 1, and 2, in 4% oxygen/argon. The ignition delay time data feature low scatter and can be correlated to a single expression with R 2 ∼ 0.99: τ ign = 7.30 × 10 −4 P −0.68 Φ 0.45 exp(18,265/ T ), where τ ign is in μs, P in atm, and T in K. OH time histories were measured using laser absorption of the R 1 (5) line of the A‐X(0,0) transition near 306.7 nm, in stoichiometric mixtures of 500 ppm DMA/O 2 /argon. The mechanism developed by Li et al. was used initially to simulate the measured DMA ignition delay times and the OH time histories. The Li et al. mechanism was then updated by adding the DMA unimolecular decomposition channel: DMA = CH 3 NH + CH 3 , with the reaction rate constant estimated by analogy to dimethyl ether decomposition, previously investigated by Cook et al. The reactions of DMA + OH were also updated based on recent work in our laboratory. The simulation results using the modified Li et al. mechanism are in good agreement with both the ignition delay times and OH time‐history data.