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Stereoscopic high-speed imaging of iron microexplosions and nanoparticle-release

LI, SHEN LU ; SANNED, DAVID LU ; HUANG, JIANQING LU ; BERROCAL, EDOUARD LU ; CAI, WEIWEI ; ALDEN, MARCUS LU ; RICHTER, MATTIAS LU and LI, ZHONGSHAN LU (2021) In Optics Express 29(21). p.34465-34476
Abstract

In this work, the combustion behavior of seeded iron particles (d50 = 70 μm) in a laminar diffusion flame was studied in a modified Mckenna flat-flame burner. Two high speed cameras in stereo configuration allowed 3D position and 3D velocity measurements of burning iron particles as well as 3D evaluation of particle microexplosions. Microexplosive processes are important since it can affect both combustion stability and formation of product components. The observed microexplosions happened before particle extinction resulting in change of trajectories, velocities, radiation intensities and fragmentation into smaller particles. It was observed for the first time that fragments of these microexplosions tend to produce planar structures. A... (More)

In this work, the combustion behavior of seeded iron particles (d50 = 70 μm) in a laminar diffusion flame was studied in a modified Mckenna flat-flame burner. Two high speed cameras in stereo configuration allowed 3D position and 3D velocity measurements of burning iron particles as well as 3D evaluation of particle microexplosions. Microexplosive processes are important since it can affect both combustion stability and formation of product components. The observed microexplosions happened before particle extinction resulting in change of trajectories, velocities, radiation intensities and fragmentation into smaller particles. It was observed for the first time that fragments of these microexplosions tend to produce planar structures. A frequent release phenomenon was observed during the iron particle combustion using magnified thermal radiation imaging and high-speed shadowgraphy. This release phenomenon was indirectly confirmed with scanning electron microscopy of combust products, revealing multiple cracked particle shells and hollow structures. Black body radiation characteristics was observed indicating the release being in condensed phase and emission spectroscopy identified FeO as intermediate species during combustion. The observed release is believed to mainly consist of iron-oxide nanoparticles formed in the homogenous reaction between vapor iron and oxidizers.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Optics Express
volume
29
issue
21
pages
12 pages
publisher
Optical Society of America
external identifiers
  • pmid:34809236
  • scopus:85116799532
ISSN
1094-4087
DOI
10.1364/OE.434836
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2021 OSA - The Optical Society. All rights reserved.
id
71e65588-d634-4424-8136-e9df4115194a
date added to LUP
2021-10-26 12:58:36
date last changed
2024-09-09 02:17:09
@article{71e65588-d634-4424-8136-e9df4115194a,
  abstract     = {{<p>In this work, the combustion behavior of seeded iron particles (d50 = 70 μm) in a laminar diffusion flame was studied in a modified Mckenna flat-flame burner. Two high speed cameras in stereo configuration allowed 3D position and 3D velocity measurements of burning iron particles as well as 3D evaluation of particle microexplosions. Microexplosive processes are important since it can affect both combustion stability and formation of product components. The observed microexplosions happened before particle extinction resulting in change of trajectories, velocities, radiation intensities and fragmentation into smaller particles. It was observed for the first time that fragments of these microexplosions tend to produce planar structures. A frequent release phenomenon was observed during the iron particle combustion using magnified thermal radiation imaging and high-speed shadowgraphy. This release phenomenon was indirectly confirmed with scanning electron microscopy of combust products, revealing multiple cracked particle shells and hollow structures. Black body radiation characteristics was observed indicating the release being in condensed phase and emission spectroscopy identified FeO as intermediate species during combustion. The observed release is believed to mainly consist of iron-oxide nanoparticles formed in the homogenous reaction between vapor iron and oxidizers.</p>}},
  author       = {{LI, SHEN and SANNED, DAVID and HUANG, JIANQING and BERROCAL, EDOUARD and CAI, WEIWEI and ALDEN, MARCUS and RICHTER, MATTIAS and LI, ZHONGSHAN}},
  issn         = {{1094-4087}},
  language     = {{eng}},
  month        = {{10}},
  number       = {{21}},
  pages        = {{34465--34476}},
  publisher    = {{Optical Society of America}},
  series       = {{Optics Express}},
  title        = {{Stereoscopic high-speed imaging of iron microexplosions and nanoparticle-release}},
  url          = {{http://dx.doi.org/10.1364/OE.434836}},
  doi          = {{10.1364/OE.434836}},
  volume       = {{29}},
  year         = {{2021}},
}