Soot Formation in Unstrained Diffusion Flames
Robert, Etienne ; Olofsson, Nils-Erik LU ; Bladh, Henrik LU ; Johnsson, Jonathan LU and Bengtsson, Per-Erik LU
(2015)
In Combustion Science and Technology
187(4).
p.577-593
- Abstract
- The formation of soot particles has been investigated in CH4/O-2 diffusion flames using a unique burner design, which allows the creation of a nearly unstrained planar reaction sheet. Spatially resolved soot volume fractions were obtained using laser-induced incandescence. These soot measurements and the sooting limits were obtained as a function of bulk flow across the flame and mixture strength. Samples were collected using thermophoretic sampling and analyzed using electron microscopy, revealing a broad range of microstructures including particles with unusually large primary diameters and carbon nanotubes. A theoretical model is presented, which confirms that under certain conditions the 1D nature of the flow field of the burner and... (More)
- The formation of soot particles has been investigated in CH4/O-2 diffusion flames using a unique burner design, which allows the creation of a nearly unstrained planar reaction sheet. Spatially resolved soot volume fractions were obtained using laser-induced incandescence. These soot measurements and the sooting limits were obtained as a function of bulk flow across the flame and mixture strength. Samples were collected using thermophoretic sampling and analyzed using electron microscopy, revealing a broad range of microstructures including particles with unusually large primary diameters and carbon nanotubes. A theoretical model is presented, which confirms that under certain conditions the 1D nature of the flow field of the burner and the strong adverse temperature gradient on the fuel side of the flame result in the soot particles being held in place by thermophoretic forces and allowed to grow for very long time periods. Some of these so-called super aggregates reached sizes of tens of microns and became visible to the naked eye in the soot layer. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/5194635
- author
- Robert, Etienne
; Olofsson, Nils-Erik
LU
; Bladh, Henrik
LU
; Johnsson, Jonathan
LU
and Bengtsson, Per-Erik
LU
- organization
- publishing date
- 2015
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Diffusion flame, Laser-induced incandescence, Soot, Super aggregate, Thermophoresis
- in
- Combustion Science and Technology
- volume
- 187
- issue
- 4
- pages
- 577 - 593
- publisher
- Taylor & Francis
- external identifiers
-
- wos:000348467200005
- scopus:84961369473
- ISSN
- 1563-521X
- DOI
- 10.1080/00102202.2014.958219
- language
- English
- LU publication?
- yes
- id
- 8d7a404d-ca63-4b19-a6fc-2f2b7e349f56 (old id 5194635)
- date added to LUP
- 2016-04-01 09:57:36
- date last changed
- 2025-04-04 15:15:17
@article{8d7a404d-ca63-4b19-a6fc-2f2b7e349f56,
abstract = {{The formation of soot particles has been investigated in CH4/O-2 diffusion flames using a unique burner design, which allows the creation of a nearly unstrained planar reaction sheet. Spatially resolved soot volume fractions were obtained using laser-induced incandescence. These soot measurements and the sooting limits were obtained as a function of bulk flow across the flame and mixture strength. Samples were collected using thermophoretic sampling and analyzed using electron microscopy, revealing a broad range of microstructures including particles with unusually large primary diameters and carbon nanotubes. A theoretical model is presented, which confirms that under certain conditions the 1D nature of the flow field of the burner and the strong adverse temperature gradient on the fuel side of the flame result in the soot particles being held in place by thermophoretic forces and allowed to grow for very long time periods. Some of these so-called super aggregates reached sizes of tens of microns and became visible to the naked eye in the soot layer.}},
author = {{Robert, Etienne and Olofsson, Nils-Erik and Bladh, Henrik and Johnsson, Jonathan and Bengtsson, Per-Erik}},
issn = {{1563-521X}},
keywords = {{Diffusion flame; Laser-induced incandescence; Soot; Super aggregate; Thermophoresis}},
language = {{eng}},
number = {{4}},
pages = {{577--593}},
publisher = {{Taylor & Francis}},
series = {{Combustion Science and Technology}},
title = {{Soot Formation in Unstrained Diffusion Flames}},
url = {{http://dx.doi.org/10.1080/00102202.2014.958219}},
doi = {{10.1080/00102202.2014.958219}},
volume = {{187}},
year = {{2015}},
}