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Investigation of absorption and scattering properties of soot aggregates of different fractal dimension at 532 nm using RDG and GMM

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DOIResolve DOI: https://doi.org/10.1080/02786826.2013.847525
AuthorSearch for: 1ORCID identifier: https://orcid.org/0000-0002-1790-6381; Search for: ; Search for: 1; Search for: 1ORCID identifier: https://orcid.org/0000-0002-6602-1926
Affiliation
  1. National Research Council Canada. Measurement Science and Standards
FormatText, Article
Abstract
Radiative properties of numerically generated fractal soot aggregates of different fractal dimensions were studied using the numerically accurate generalized Mie-solution method (GMM) and the Rayleigh-Debye-Gans (RDG) approximate theory. Fractal aggregates of identical prefactor but different fractal dimensions, namely, 1.4, 1.78, and 2.1, were generated numerically using a tunable algorithm of cluster–cluster aggregation for aggregates containing up to 800 primary particles. Radiative properties of these aggregates were calculated at a wavelength of 532 nm assuming a soot refractive index of 1.6 + 0.6i. Four commonly used structure factors in the RDG approximation were used to investigate the effect of structure factor on the differential and total scattering cross-sections and the asymmetry factor. The differential and total scattering properties calculated using the RDG approximation become increasingly sensitive to the structure factor with increasing the fractal dimension. Primary particle interactions are the fundamental mechanism for the aggregate absorption enhancement for small aggregates and the shielding effect for larger aggregates. The extent of these two competing factors is dependent on the fractal dimension and aggregate size. RDG reasonably predicts the effect of fractal dimension on the scattering properties, but fails to account for the effect of aggregation or fractal morphology on the absorption property of fractal soot aggregates, though the error is in general less than 15%.
Publication date
PublisherTaylor & Francis
American Association for Aerosol Research
In
  • Aerosol Science and Technology 47, no. 12 (10 October 2013): 1393–1405.
LanguageEnglish
Peer reviewedYes
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Record identifier879ccb2e-be76-4b2d-ba8d-780ffe2425c5
Record created2024-09-06
Record modified2024-09-06

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