Estimating soot primary particle diameter using time-resolved laser-induced incandescence

Joseph P. Abrahamson, Madhu Singh, Randy Lee Vander Wal

Research output: Contribution to conferencePaper

Abstract

Time-resolved LII 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 TEM comparisons. Extraction of primary particle size (dp) values by fitting the time-resolved LII data does not yield a single consistent value for each of the carbon blacks with TEM measured primary particle sizes of 18, 45 and 112 nm. The conductive heat transfer coefficient is shown to differ substantially between these materials, even when normalized for primary particle surface area. Aggregate structure in the form of intra-aggregate connectivity and shielding is suggested as the underlying cause, not presently captured by LII models.

Original languageEnglish (US)
StatePublished - Jan 1 2017
Event10th U.S. National Combustion Meeting - College Park, United States
Duration: Apr 23 2017Apr 26 2017

Other

Other10th U.S. National Combustion Meeting
CountryUnited States
CityCollege Park
Period4/23/174/26/17

Fingerprint

incandescence
Soot
soot
estimating
Particle size
Lasers
Carbon black
lasers
Size determination
Transmission electron microscopy
size determination
transmission electron microscopy
Shielding
laser annealing
Heat transfer coefficients
carbon
Nanostructures
heat transfer coefficients
Optical properties
conductive heat transfer

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry
  • Mechanical Engineering

Cite this

Abrahamson, J. P., Singh, M., & Vander Wal, R. L. (2017). Estimating soot primary particle diameter using time-resolved laser-induced incandescence. Paper presented at 10th U.S. National Combustion Meeting, College Park, United States.
Abrahamson, Joseph P. ; Singh, Madhu ; Vander Wal, Randy Lee. / Estimating soot primary particle diameter using time-resolved laser-induced incandescence. Paper presented at 10th U.S. National Combustion Meeting, College Park, United States.
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Abrahamson, JP, Singh, M & Vander Wal, RL 2017, 'Estimating soot primary particle diameter using time-resolved laser-induced incandescence' Paper presented at 10th U.S. National Combustion Meeting, College Park, United States, 4/23/17 - 4/26/17, .

Estimating soot primary particle diameter using time-resolved laser-induced incandescence. / Abrahamson, Joseph P.; Singh, Madhu; Vander Wal, Randy Lee.

2017. Paper presented at 10th U.S. National Combustion Meeting, College Park, United States.

Research output: Contribution to conferencePaper

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AU - Singh, Madhu

AU - Vander Wal, Randy Lee

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N2 - Time-resolved LII 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 TEM comparisons. Extraction of primary particle size (dp) values by fitting the time-resolved LII data does not yield a single consistent value for each of the carbon blacks with TEM measured primary particle sizes of 18, 45 and 112 nm. The conductive heat transfer coefficient is shown to differ substantially between these materials, even when normalized for primary particle surface area. Aggregate structure in the form of intra-aggregate connectivity and shielding is suggested as the underlying cause, not presently captured by LII models.

AB - Time-resolved LII 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 TEM comparisons. Extraction of primary particle size (dp) values by fitting the time-resolved LII data does not yield a single consistent value for each of the carbon blacks with TEM measured primary particle sizes of 18, 45 and 112 nm. The conductive heat transfer coefficient is shown to differ substantially between these materials, even when normalized for primary particle surface area. Aggregate structure in the form of intra-aggregate connectivity and shielding is suggested as the underlying cause, not presently captured by LII models.

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Abrahamson JP, Singh M, Vander Wal RL. Estimating soot primary particle diameter using time-resolved laser-induced incandescence. 2017. Paper presented at 10th U.S. National Combustion Meeting, College Park, United States.