Journal
PROCEEDINGS OF THE COMBUSTION INSTITUTE
Volume 32, Issue -, Pages 681-688Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.proci.2008.07.023
Keywords
Soot; Premixed flame; Particle size distribution; Morphology
Funding
- Strategic Environmental Research and Developmental Program
- National Science Foundation [CBET-0651990]
- National Aeronautics and Space Administration [NNG06GE89G, NNG06GI51G]
- EMSL
- DOE's Office of Biological and Environmental Research
- Pacific Northwest National Laboratory (PNNL)
- US Department of Energy by Battelle Memorial Institute [DE-AC06-76RLO 1830]
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Particle size distribution functions of nascent soot formed-in-four burner-stabilized, premixed ethylene-oxygen-argon flames were studied in a spatially resolved manner by online sampling/scanning mobility particle sizer. Particle morphology was analyzed by atomic force microscopy (AFM) of substrate-deposited samples. Two of the four flames were doped with benzene. An aerosol electrometer is introduced to extend the lower detection limit to around 1.5 nm in diameter. The results show that the bimodal behavior of particle size is applicable to all premixed ethylene flames studied. The variation of the size distribution from flame to flame is conclusively attributed to flame temperature variation. Under the condition of an equal carbon concentration, benzene doping leads to negligible changes in the characteristics of the size distribution. For all flames studied, AFM observations show that nascent soot is liquid-like and spreads extensively upon impact on a substrate surface. (c) 2009 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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