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Title: Determination of soot scattering coefficient from extinction and three-angle scattering in a laminar diffusion flame

Abstract

The total scattering coefficient is determined from three multiangle scattering measurements at different heights above the burner in a nonsooting laminar ethylene diffusion flame. The local extinction coefficient is determined from multichord extinction measurements. The above analysis quantifies the contribution from scattering to extinction without knowledge of the soot primary particle diameter or the morphology of the aggregates, and the absorption coefficient can now be determined. The primary particle diameter, the number density of primary particles, the average number of primary particles in an aggregate, and the width of the lognormal distribution function for the number of primary particles in an aggregate are calculated using the absorption coefficient and assumed constant values for the fractal dimension, the fractal prefactor, and the complex refractive index for soot. The values for the primary particle diameter obtained from the in situ measurements in this study compare well with those obtained from transmission electron microscopic measurements of thermophoretically sampled soot aggregates in a previous study at all heights in the diffusion flame, while the calculated soot structure parameters compare well with previous studies only at heights between 30 and 50 mm above the burner. (author)

Authors:
; ; ;  [1]
  1. Department of Mechanical Engineering, The Pennsylvania State University, University Park, PA 16802 (United States)
Publication Date:
OSTI Identifier:
20880649
Resource Type:
Journal Article
Resource Relation:
Journal Name: Combustion and Flame; Journal Volume: 149; Journal Issue: 1-2; Other Information: Elsevier Ltd. All rights reserved
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; SOOT; SCATTERING; PARTICLE SIZE; COMPARATIVE EVALUATIONS; ETHYLENE; LAMINAR FLAMES; ABSORPTION; DISTRIBUTION FUNCTIONS; DENSITY; ALBEDO; FLAME EXTINCTION

Citation Formats

Iyer, Suresh S., Litzinger, Thomas A., Lee, Seong-Young, and Santoro, Robert J.. Determination of soot scattering coefficient from extinction and three-angle scattering in a laminar diffusion flame. United States: N. p., 2007. Web. doi:10.1016/J.COMBUSTFLAME.2006.11.009.
Iyer, Suresh S., Litzinger, Thomas A., Lee, Seong-Young, & Santoro, Robert J.. Determination of soot scattering coefficient from extinction and three-angle scattering in a laminar diffusion flame. United States. doi:10.1016/J.COMBUSTFLAME.2006.11.009.
Iyer, Suresh S., Litzinger, Thomas A., Lee, Seong-Young, and Santoro, Robert J.. Sun . "Determination of soot scattering coefficient from extinction and three-angle scattering in a laminar diffusion flame". United States. doi:10.1016/J.COMBUSTFLAME.2006.11.009.
@article{osti_20880649,
title = {Determination of soot scattering coefficient from extinction and three-angle scattering in a laminar diffusion flame},
author = {Iyer, Suresh S. and Litzinger, Thomas A. and Lee, Seong-Young and Santoro, Robert J.},
abstractNote = {The total scattering coefficient is determined from three multiangle scattering measurements at different heights above the burner in a nonsooting laminar ethylene diffusion flame. The local extinction coefficient is determined from multichord extinction measurements. The above analysis quantifies the contribution from scattering to extinction without knowledge of the soot primary particle diameter or the morphology of the aggregates, and the absorption coefficient can now be determined. The primary particle diameter, the number density of primary particles, the average number of primary particles in an aggregate, and the width of the lognormal distribution function for the number of primary particles in an aggregate are calculated using the absorption coefficient and assumed constant values for the fractal dimension, the fractal prefactor, and the complex refractive index for soot. The values for the primary particle diameter obtained from the in situ measurements in this study compare well with those obtained from transmission electron microscopic measurements of thermophoretically sampled soot aggregates in a previous study at all heights in the diffusion flame, while the calculated soot structure parameters compare well with previous studies only at heights between 30 and 50 mm above the burner. (author)},
doi = {10.1016/J.COMBUSTFLAME.2006.11.009},
journal = {Combustion and Flame},
number = 1-2,
volume = 149,
place = {United States},
year = {Sun Apr 15 00:00:00 EDT 2007},
month = {Sun Apr 15 00:00:00 EDT 2007}
}