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Local gas heating in sooting flames by heat transfer from laser-heated particles investigated using rotational CARS and LII

Nordström, Emil LU ; Olofsson, Nils-Erik LU ; Simonsson, Johan LU ; Johnsson, Jonathan LU ; Bladh, Henrik LU and Bengtsson, Per-Erik LU (2015) In Proceedings of the Combustion Institute 35. p.3707-3713
Abstract
Soot particles strongly absorb radiation in the visible and infrared spectral regions, and the soot interaction with laser light during laser diagnostic interrogation leads to particle heating and often to subsequent sublimation. Consequently, laser-heated particles transfer heat to the ambient gas leading to local gas heating, a process that has received minor attention so far in the diagnostic community. In the present work, this specific local gas heating is measured in a pump-probe-type experiment. A 1064-nm laser beam heated the soot particles in an ethylene/ air diffusion flame (on a Gulder-burner) with known soot volume fraction, and a two-beam rotational coherent anti-Stokes Raman spectroscopy (CARS) setup was used to probe the... (More)
Soot particles strongly absorb radiation in the visible and infrared spectral regions, and the soot interaction with laser light during laser diagnostic interrogation leads to particle heating and often to subsequent sublimation. Consequently, laser-heated particles transfer heat to the ambient gas leading to local gas heating, a process that has received minor attention so far in the diagnostic community. In the present work, this specific local gas heating is measured in a pump-probe-type experiment. A 1064-nm laser beam heated the soot particles in an ethylene/ air diffusion flame (on a Gulder-burner) with known soot volume fraction, and a two-beam rotational coherent anti-Stokes Raman spectroscopy (CARS) setup was used to probe the local gas temperature on time scales from nanoseconds to milliseconds. The temperature of the heated particles was simultaneously probed using a two-color laser-induced incandescence (2C-LII) detection system. The results show that laser heating of soot particles from flame temperatures to sublimation temperatures leads to local gas heating of similar to 100 K at a soot volume fraction of 4 ppm, in good agreement with theoretical predictions. The implication of these results to the application of laser diagnostic techniques is briefly discussed. (C) 2014 The Combustion Institute. Published by Elsevier Inc. All rights reserved. (Less)
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author
organization
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Contribution to journal
publication status
published
subject
keywords
Local gas heating, Soot, Rotational coherent anti-Stokes Raman, spectroscopy, Laser-induced incandescence
in
Proceedings of the Combustion Institute
volume
35
pages
3707 - 3713
publisher
Elsevier
external identifiers
  • wos:000348049500141
  • scopus:84941632317
ISSN
1540-7489
DOI
10.1016/j.proci.2014.08.004
language
English
LU publication?
yes
id
a353a221-2f7c-4244-b8fb-cfc09dd0d8e3 (old id 5204280)
date added to LUP
2015-03-25 14:25:14
date last changed
2017-08-20 03:10:21
@article{a353a221-2f7c-4244-b8fb-cfc09dd0d8e3,
  abstract     = {Soot particles strongly absorb radiation in the visible and infrared spectral regions, and the soot interaction with laser light during laser diagnostic interrogation leads to particle heating and often to subsequent sublimation. Consequently, laser-heated particles transfer heat to the ambient gas leading to local gas heating, a process that has received minor attention so far in the diagnostic community. In the present work, this specific local gas heating is measured in a pump-probe-type experiment. A 1064-nm laser beam heated the soot particles in an ethylene/ air diffusion flame (on a Gulder-burner) with known soot volume fraction, and a two-beam rotational coherent anti-Stokes Raman spectroscopy (CARS) setup was used to probe the local gas temperature on time scales from nanoseconds to milliseconds. The temperature of the heated particles was simultaneously probed using a two-color laser-induced incandescence (2C-LII) detection system. The results show that laser heating of soot particles from flame temperatures to sublimation temperatures leads to local gas heating of similar to 100 K at a soot volume fraction of 4 ppm, in good agreement with theoretical predictions. The implication of these results to the application of laser diagnostic techniques is briefly discussed. (C) 2014 The Combustion Institute. Published by Elsevier Inc. All rights reserved.},
  author       = {Nordström, Emil and Olofsson, Nils-Erik and Simonsson, Johan and Johnsson, Jonathan and Bladh, Henrik and Bengtsson, Per-Erik},
  issn         = {1540-7489},
  keyword      = {Local gas heating,Soot,Rotational coherent anti-Stokes Raman,spectroscopy,Laser-induced incandescence},
  language     = {eng},
  pages        = {3707--3713},
  publisher    = {Elsevier},
  series       = {Proceedings of the Combustion Institute},
  title        = {Local gas heating in sooting flames by heat transfer from laser-heated particles investigated using rotational CARS and LII},
  url          = {http://dx.doi.org/10.1016/j.proci.2014.08.004},
  volume       = {35},
  year         = {2015},
}