We have obtained temporally-resolved laser-induced incandescence (LII) signals front different size primary particles produced by diffusion flames of methane, ethane, ethylene, and acetylene. These results represent the first dorect comparison between primary particle sizes based on optical measurements and those directly measured through TEM. Two measures of the temporal decay of the LII signal reveal a correlation with primary particle size. Comparison between primary particle sizes based on the calibrations using the temporal analyais of the LII signal and TEM measurements reveal agreement within the growth region and very late in the oxidation region within an ethtylene gas-jet diffusion flame. Significant differences exist at intermediate positions which likely represent the effects of cluster-cluster aggregation within the oxidation region.
|Original language||English (US)|
|Number of pages||4|
|Journal||ACS Division of Fuel Chemistry, Preprints|
|State||Published - Dec 1 1998|
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