TY - CONF
T1 - Informing TiRe-LII assumptions of soot nanostructure and optical properties for estimation of soot primary particle diameter
AU - Singh, Madhu
AU - Wal, Randy L.Vander
N1 - Funding Information:
The authors acknowledge support by the National Science Foundation (NSF), Chemical, Bioengineering, Environmental, and Transport Systems (CBET), under Grant Number 1236757.
Funding Information:
The authors acknowledge support by the National Science Foundation (NSF), Chemical, Bioengineering, Environmental, and Transport Systems (CBET), under Grant Number 1236757. TEM was performed using the facilities of the Materials Research Institute at The Pennsylvania State University.
Publisher Copyright:
© 2018 Western States Section/Combustion Institute. All rights reserved.
PY - 2018
Y1 - 2018
N2 - Time-resolved laser-induced incandescence for primary particle size determination is tested using three model carbon blacks. Optical properties change as does the nanostructure upon laser annealing whereas aggregate morphology and primary particle size remain equivalent to the original material, as shown by transmission electron microscopy (TEM). Primary particle diameters found from fitting experimentally measured time-resolved laser-induced incandescence (LII) signals with existing models do not match the particle diameters as directly visualized by TEM. The accommodation coefficient is shown to be a crucial parameter which can result in substantial variations in simulated conductive cooling profiles for particle sizing. Aggregate structure in the form of intra-Aggregate connectivity and shielding is an additional underlying cause for erroneous particle sizing, not presently captured by LII models.
AB - Time-resolved laser-induced incandescence for primary particle size determination is tested using three model carbon blacks. Optical properties change as does the nanostructure upon laser annealing whereas aggregate morphology and primary particle size remain equivalent to the original material, as shown by transmission electron microscopy (TEM). Primary particle diameters found from fitting experimentally measured time-resolved laser-induced incandescence (LII) signals with existing models do not match the particle diameters as directly visualized by TEM. The accommodation coefficient is shown to be a crucial parameter which can result in substantial variations in simulated conductive cooling profiles for particle sizing. Aggregate structure in the form of intra-Aggregate connectivity and shielding is an additional underlying cause for erroneous particle sizing, not presently captured by LII models.
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M3 - Paper
AN - SCOPUS:85049158215
T2 - 2018 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2018
Y2 - 4 March 2018 through 7 March 2018
ER -