Onset of carbonization: Spatial location via simultaneous LIF-LII and characterization via TEM

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Soot formation/growth processes include fuel pyrolysis reactions resulting in PAHs, the coalescence/condensation of PAHs and other fuel pyrolysis intermediates ultimately leading to soot. Here simultaneous LIF-LII images identify the fuel pyrolysis (PAH containing) and soot containing regions along the axial flow streamline within a laminar ethylene/air diffusion flame. Spectrally resolved emission, excitation wavelength dependence and temporal decay characterize and identify the LIF and LII signals within the simultaneous LIF-LII images. The boundary between the PAH and soot containing regions is postulated to mark the onset of carbonization of condensed/coalesced soot precursor material. Support for this postulate is based on the observed photophysical changes resulting in a decline in the LIF intensity and emergence of LII signal along the axial streamline between 33 and 34 mm HAB. Bright and dark field transmission electron microscopy images of material sampled from the axial centerline at this axial height confirm the interpretation of the in-situ optical measurements by revealing the initial transformation of soot precursor material towards solid carbonaceous soot.

Original languageEnglish (US)
Pages (from-to)343-360
Number of pages18
JournalCombustion science and technology
Volume118
Issue number4-6
StatePublished - Dec 1 1996

Fingerprint

Soot
carbonization
Carbonization
soot
laser induced fluorescence
Transmission electron microscopy
transmission electron microscopy
polycyclic aromatic hydrocarbons
Polycyclic aromatic hydrocarbons
pyrolysis
Pyrolysis
axial flow
Axial flow
diffusion flames
axioms
Coalescence
optical measurement
coalescing
Condensation
Ethylene

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Physics and Astronomy(all)

Cite this

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title = "Onset of carbonization: Spatial location via simultaneous LIF-LII and characterization via TEM",
abstract = "Soot formation/growth processes include fuel pyrolysis reactions resulting in PAHs, the coalescence/condensation of PAHs and other fuel pyrolysis intermediates ultimately leading to soot. Here simultaneous LIF-LII images identify the fuel pyrolysis (PAH containing) and soot containing regions along the axial flow streamline within a laminar ethylene/air diffusion flame. Spectrally resolved emission, excitation wavelength dependence and temporal decay characterize and identify the LIF and LII signals within the simultaneous LIF-LII images. The boundary between the PAH and soot containing regions is postulated to mark the onset of carbonization of condensed/coalesced soot precursor material. Support for this postulate is based on the observed photophysical changes resulting in a decline in the LIF intensity and emergence of LII signal along the axial streamline between 33 and 34 mm HAB. Bright and dark field transmission electron microscopy images of material sampled from the axial centerline at this axial height confirm the interpretation of the in-situ optical measurements by revealing the initial transformation of soot precursor material towards solid carbonaceous soot.",
author = "{Vander Wal}, {Randy Lee}",
year = "1996",
month = "12",
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language = "English (US)",
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journal = "Combustion Science and Technology",
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}

Onset of carbonization : Spatial location via simultaneous LIF-LII and characterization via TEM. / Vander Wal, Randy Lee.

In: Combustion science and technology, Vol. 118, No. 4-6, 01.12.1996, p. 343-360.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Onset of carbonization

T2 - Spatial location via simultaneous LIF-LII and characterization via TEM

AU - Vander Wal, Randy Lee

PY - 1996/12/1

Y1 - 1996/12/1

N2 - Soot formation/growth processes include fuel pyrolysis reactions resulting in PAHs, the coalescence/condensation of PAHs and other fuel pyrolysis intermediates ultimately leading to soot. Here simultaneous LIF-LII images identify the fuel pyrolysis (PAH containing) and soot containing regions along the axial flow streamline within a laminar ethylene/air diffusion flame. Spectrally resolved emission, excitation wavelength dependence and temporal decay characterize and identify the LIF and LII signals within the simultaneous LIF-LII images. The boundary between the PAH and soot containing regions is postulated to mark the onset of carbonization of condensed/coalesced soot precursor material. Support for this postulate is based on the observed photophysical changes resulting in a decline in the LIF intensity and emergence of LII signal along the axial streamline between 33 and 34 mm HAB. Bright and dark field transmission electron microscopy images of material sampled from the axial centerline at this axial height confirm the interpretation of the in-situ optical measurements by revealing the initial transformation of soot precursor material towards solid carbonaceous soot.

AB - Soot formation/growth processes include fuel pyrolysis reactions resulting in PAHs, the coalescence/condensation of PAHs and other fuel pyrolysis intermediates ultimately leading to soot. Here simultaneous LIF-LII images identify the fuel pyrolysis (PAH containing) and soot containing regions along the axial flow streamline within a laminar ethylene/air diffusion flame. Spectrally resolved emission, excitation wavelength dependence and temporal decay characterize and identify the LIF and LII signals within the simultaneous LIF-LII images. The boundary between the PAH and soot containing regions is postulated to mark the onset of carbonization of condensed/coalesced soot precursor material. Support for this postulate is based on the observed photophysical changes resulting in a decline in the LIF intensity and emergence of LII signal along the axial streamline between 33 and 34 mm HAB. Bright and dark field transmission electron microscopy images of material sampled from the axial centerline at this axial height confirm the interpretation of the in-situ optical measurements by revealing the initial transformation of soot precursor material towards solid carbonaceous soot.

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