Study of the soot nucleation zone of rich methane-oxygen flames

D’Alessio, Aldo; Lorenzo, A. Di; Borghese, A.; Beretta, F.; Masi, S.

doi:10.1016/s0082-0784(77)80364-0

Cited by 27 publications

(8 citation statements)

References 13 publications

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“…[21][22][23] The calculation of soot properties is based on the Rayleigh theory for isotropic spheres, in which the diameters of the spheres are much smaller than the laser wavelength. In this section, only relations that are important for the final conclusions are elucidated; the full theory can be found, for example, in Ref.…”

Section: A Scattering-extinctionmentioning

confidence: 99%

Laser-induced incandescence for soot particle size measurements in premixed flat flames

2000

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Measurements of soot properties by means of laser-induced incandescence ͑LII͒ and combined scatteringextinction were performed in well-characterized premixed ethylene-air flames. In particular, the possibility of using LII as a tool for quantitative particle sizing was investigated. Particle sizes were evaluated from the temporal decay of the LII signal combined with heat balance modeling of laser-heated particles, and these sizes were compared with the particle sizes deduced from scattering-extinction measurements based on isotropic sphere theory. The correspondence was good early in the sootformation process but less good at later stages, possibly because aggregation to clusters began to occur. A critical analysis has been made of how uncertainties in different parameters, both experimental and in the model, affect the evaluated particle sizes for LII. A sensitivity analysis of the LII model identified the ambient-flame temperature as a major source of uncertainty in the evaluated particle size, a conclusion that was supported by an analysis based on temporal LII profiles.

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Section: A Scattering-extinctionmentioning

confidence: 99%

Laser-induced incandescence for soot particle size measurements in premixed flat flames

2000

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“…However, the key precursors leading to the formation of carbon particles have not been identified, and many of the questions concerning possible mechanisms posed long ago are still open (Parker and Wolfhard, 1950). Recently, experimental techniques have achieved steady gains in the study of molecular species by mass spectrometry (Bittner and Howard, 1981;Olson and Calcote, 1981) and particles by laser light scattering (D' Alessio et al, 1977;Kent et al, 1981;Prado et al, 1981). As more experimental data have become available, there has been renewed interest in unravelling the complex series of steps which lead eventually to soot formation .…”

Section: Introductionmentioning

confidence: 99%

Laser-Induced Ionization and Mobility Measurements of Very Small Particles in Premixed Flames at the Sooting Limit

Smyth

Mallard

1981

Combustion Science and Technology

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Laser-induced ionization signals are observed in a premixed C2H2/air flame at the sooting limit and are attributed to thermal ionization of very small particles. The mobilities of these species are derived from io n velocity measurements and compared with the mobility of Na! for identical flame conditions. From a series of measured mobil ities, estimates are made for the particle mass (2300-6100 amu) and diameter (1.6-2.2 nm) . This experimental method is thus a new optical means for probing the early stages of soot formation.

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“…In order to gain greater understanding of the soot processes in fl ames, it has been necessary to undertake extensive chemical and physical measurements of temperature and velocity as well as laser extinction, scattering, and fl uorescence in premixed fl ames [84,85] , Wolfhard-Parker burners [86][87][88] , coannular burners [89][90][91] , and opposed-jet diffusion fl ames [ Harris and Weiner [74,75] have contributed much to the study of soot particle history in premixed fl ames. They used laser light scattering and extinction measurements to determine particle size, number density, and volume fraction in experiments with fl at fl ame burners stabilized by a water-cooled porous plug.…”

Section: Detailed Structure Of Sooting Flamesmentioning

confidence: 99%