Soot particle size measurements in ethylene diffusion flames at elevated pressures

Scott Steinmetz, Tiegang Fang, William L. Roberts

Research output: Contribution to journalArticlepeer-review

65 Scopus citations


Soot particle size is investigated in laminar nitrogen-diluted ethylene coflow diffusion flames at 4, 8, 12 and 16 atm. Line of sight attenuation and scattering are used to measure two-dimensional soot volume fraction and particle size fields for the first time at elevated pressures. Soot volume fraction dependence on pressure is consistent with the observations of similar studies, scaling approximately with the square of pressure. Scattering intensity is analyzed through Rayleigh and Rayleigh-Debye-Gans polydisperse fractal aggregate theories to provide two estimates of particle size. An increase in overall particle sizes with pressure is found, consistent with similar one-dimensional studies. Particle diameters in the annulus of the flame increase faster with pressure than those on centerline. Contrary to previous studies, the dependence of particle size on pressure was found to taper off between 8 and 12 atm, with little observed growth beyond 12 atm. The measurements provide additional data for one of the International Sooting Flame (ISF) workshop's target pressurized flames.
Original languageEnglish (US)
Pages (from-to)85-93
Number of pages9
JournalCombustion and Flame
StatePublished - May 7 2016

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The research reported in this work was funded by the U.S. Army Research Office under grant W911NF-10-1-0118, and by the Clean Combustion Research Center at King Abdullah University of Science and Technology.


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