Carbon particle formation and decay in two-step pyrolysis of carbon suboxide behind shock waves

Deppe, Joachim; Emelianov, A. V.; Еремин, А. В.; Jander, H.; Wagner, H. Gg.; Zaslonko, I.S.

doi:10.1016/s0082-0784(00)80667-0

Cited by 17 publications

(8 citation statements)

References 13 publications

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“…In the mixture 20%C 3 O 2 +Ar a good coincidence of measured and calculated values of pressure and wave velocity is observed. At these conditions the calculated temperature behind the detonation front is 2460 K that according to (Deppe et al 2000) corresponds to maximum condensation rate. This fact is clearly demonstrated by the extinction profile in Fig.2C.…”

Section: Discussionmentioning

confidence: 86%

“…However such a behavior of the process is correct until the reversal reactions of nanoparticle decay come into play. Toward higher temperatures particle formation rate becomes slower (Deppe et al 2000). At T = 3000 K the total particle rise time is more than 100 µs and at T = 3400 K the rate of particle decay (evaporation) is already higher than the formation rate.…”

Section: Discussionmentioning

confidence: 98%

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Detonation wave driven by condensation of supersaturated carbon vapor

et al. 2009

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An experimental observation of a detonation wave driven by the energy of condensation of supersaturated carbon vapor is reported. The carbon vapor was formed by the thermal decay of unstable carbon suboxide C3O2 behind shock waves in mixtures containing 10-30% C3O2 in Ar. In the mixture 10% C3O2+Ar the insufficient heat release resulted in a regime of overdriven detonation. In the mixture 20% C3O2+Ar measured values of the pressure and wave velocity coincident with calculated Chapman-Jouguet parameters were attained. In the richest mixture 30% C3O2+Ar an excess heat release caused the slowing down of the condensation rate and the regime of underdriven detonation was observed.

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Section: Discussionmentioning

confidence: 86%

Section: Discussionmentioning

confidence: 98%

Detonation wave driven by condensation of supersaturated carbon vapor

et al. 2009

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“…Vertical arrows specify estimations of particle sizes at which an essential increase in refractive index on 633 nm takes place. In case of pure carbon particles owing to larger refractive index [9][10][11], extinction starts growing at the smaller sizes.…”

Section: Discussionmentioning

confidence: 99%

“…Carbon suboxide is a rather unstable volatile compound decomposing to carbon atom and two CO molecules at 1400-1600 K. Therefore, the process of C 3 O 2 decomposition and subsequent carbon condensation proceeds at the total absence of secondary gaseous reactions (in the system, only CO remains, chemically stable at T <4000 K). The effective rates of carbon particle formation, observed in C 3 O 2 pyrolysis [9][10][11][12][13], are substantially higher than those obtained for all hydrocarbons [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Carbon condensation wave in C3O2 and C2H2 initiated by a shock wave

Emelianov¹,

Еремин²,

Jander³

et al. 2011

Proceedings of the Combustion Institute

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“…The measured particle yield did not depend on the C 3 O 2 mole fraction and had a maximum at approximately 1600 K for all mixtures. Recently, a series of measurements have been carried out to study the particle formation at a higher temperature range (from 2000 K to 3700 K) [6][7][8][9]. It was found that at the measured time of 1 ms after the reflected shock wave, the temperature dependence of the particle yield showed double bell-shaped curves with two local maxima at 1600 K and 3200 K. More recently, two studies [10,11] provided new explanations for the double bell-shaped optical densities measured in the previous experiments.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of carbonaceous nanoparticle formation behind shock waves

Wen

Thomson

Lightstone

2006

Combustion Theory and Modelling

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By incorporating complex chemical kinetics for both gaseous and particulate phases with a fixed sectional aerosol dynamics model, a detailed description of the properties of carbonaceous nanoparticles formed in the pyrolysis of carbon suboxide behind a reflected shock wave can be obtained. The model successfully predicted the induction time, growth rate and particle yield for the shock tube experiment. The calculated time-dependent particle volume fractions were in good agreement with the measured optical densities, and the averaged particle diameters were in reasonable agreement with the measured particle size using LII (laser-induced incandescence) and TEM (transmission electron microscope). The predicted particle size distribution as a function of residence time showed an evolution from the power law shape to a bi-modal shape. The temperature dependence of particle properties has been also investigated. The second bell at the high temperature range, which has been argued as resulting from particle nucleation behind the incident wave during the experiment, was found in the numerical simulation of particle formation behind the reflected shock wave where no incident wave is included. Analysis of the simulation results showed that the double bell-shaped particle yield arises from the different particle nucleation timescales and the changing surface growth rates at different temperatures.

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Carbon particle formation and decay in two-step pyrolysis of carbon suboxide behind shock waves

Cited by 17 publications

References 13 publications

Detonation wave driven by condensation of supersaturated carbon vapor

Detonation wave driven by condensation of supersaturated carbon vapor

Carbon condensation wave in C3O2 and C2H2 initiated by a shock wave

Numerical study of carbonaceous nanoparticle formation behind shock waves

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