The effect of particle aggregation on the absorption and emission properties of mono- and polydisperse soot aggregates

Download
  1. Get@NRC: The effect of particle aggregation on the absorption and emission properties of mono- and polydisperse soot aggregates (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1007/s00340-011-4382-x
AuthorSearch for: ; Search for:
TypeArticle
Journal titleApplied Physics B: Lasers and Optics
ISSN0946-2171
Volume104
Issue2
Pages343355; # of pages: 13
SubjectAggregate distribution; Different sizes; Emission properties; Fluences; FRactal aggregate; Fractal parameters; High pressure; Laminar diffusion flames; Laser energy absorption; Monodisperse; Numerical calculation; Particle aggregation; Polydisperses; Primary particles; Rayleigh-debye-gans; Signal ratios; Soot aggregates; Soot loading; Soot particles; Thermal emissions; Two wavelength; Two-color laser-induced incandescence; Absorption; Aggregates; Atmospheric pressure; Dust; Electromagnetic wave emission; Fractals; Laser heating; Polydispersity; Pressure effects; Soot; Agglomeration
AbstractThis study concerns the effect of soot-particle aggregation on the soot temperature derived from the signal ratio in two-color laser-induced incandescence measurements. The emissivity of aggregated fractal soot particles was calculated using both the commonly used Rayleigh-Debye-Gans fractal-aggregate theory and the generalized Mie-solution method in conjunction with numerically generated fractal aggregates of specified fractal parameters typical of flame-generated soot. The effect of aggregation on soot temperature was first evaluated for monodisperse aggregates of different sizes and for a lognormally distributed aggregate ensemble at given signal ratios between the two wavelengths. Numerical calculations were also conducted to account for the effect of aggregation on both laser heating and thermal emission at the two wavelengths for determining the effective soot temperature of polydisperse soot aggregates. The results show that the effect of aggregation on laser energy absorption is important at low fluences. The effect of aggregation on soot emissivity is relatively unimportant in LII applications to typical laminar diffusion flames at atmospheric pressure, but it can become more important in flames at high pressures due to larger primary particles and wider aggregate distributions associated with enhanced soot loading. © 2011 Her Majesty the Queen in Right of Canada.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Chemical Process and Environmental Technology (ICPET-ITPCE)
Peer reviewedYes
NPARC number21271110
Export citationExport as RIS
Report a correctionReport a correction
Record identifierc6bf79c6-3694-42d7-858c-93ee600bfb46
Record created2014-03-24
Record modified2016-05-09
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)