Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Volume expansion and micro-explosion of combusting iron particles analyzed using magnified holographic imaging

Huang, Jianqing LU ; Wu, Zhiyong LU ; Cai, Weiwei ; Berrocal, Edouard LU ; Aldén, Marcus LU and Li, Zhongshan LU (2023) In Powder Technology 420.
Abstract

In-situ characterization of combusting iron particles is of great importance for understanding the combustion mechanism. Here, magnified holographic imaging is employed to investigate the transient morphology and dynamics of iron particles during combustion. The volume expansion behavior of combusting particles (mean diameter: 85 μm) is observed in situ. The particle volume increases to eight times of its initial volume within 0.14 ms, indicating that a hollow structure is generated due to bubbles formation inside the particle. In addition, the micro-explosion behaviors of expanded and unexpanded particles are resolved with high spatiotemporal resolutions. The ratio between the overall volume of the fragments (after explosion) and the... (More)

In-situ characterization of combusting iron particles is of great importance for understanding the combustion mechanism. Here, magnified holographic imaging is employed to investigate the transient morphology and dynamics of iron particles during combustion. The volume expansion behavior of combusting particles (mean diameter: 85 μm) is observed in situ. The particle volume increases to eight times of its initial volume within 0.14 ms, indicating that a hollow structure is generated due to bubbles formation inside the particle. In addition, the micro-explosion behaviors of expanded and unexpanded particles are resolved with high spatiotemporal resolutions. The ratio between the overall volume of the fragments (after explosion) and the volume of the expanded particle (before explosion) is around 0.2, which further validates the existence of the gas bubbles. Finally, based on the observed evolution of particle morphology, a hypothesis exploring the release of gases dissolved in burning particles as affecting combustion is supported experimentally.

(Less)
Please use this url to cite or link to this publication:
author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Iron particle combustion, Magnified digital holography, Micro-explosion, Particle morphology, Volume expansion
in
Powder Technology
volume
420
article number
118412
publisher
Elsevier
external identifiers
  • scopus:85149960217
ISSN
0032-5910
DOI
10.1016/j.powtec.2023.118412
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2023 Elsevier B.V.
id
bddbd7e5-5900-4a81-9742-72ac41342ab9
date added to LUP
2023-03-31 11:57:16
date last changed
2023-11-17 17:37:25
@article{bddbd7e5-5900-4a81-9742-72ac41342ab9,
  abstract     = {{<p>In-situ characterization of combusting iron particles is of great importance for understanding the combustion mechanism. Here, magnified holographic imaging is employed to investigate the transient morphology and dynamics of iron particles during combustion. The volume expansion behavior of combusting particles (mean diameter: 85 μm) is observed in situ. The particle volume increases to eight times of its initial volume within 0.14 ms, indicating that a hollow structure is generated due to bubbles formation inside the particle. In addition, the micro-explosion behaviors of expanded and unexpanded particles are resolved with high spatiotemporal resolutions. The ratio between the overall volume of the fragments (after explosion) and the volume of the expanded particle (before explosion) is around 0.2, which further validates the existence of the gas bubbles. Finally, based on the observed evolution of particle morphology, a hypothesis exploring the release of gases dissolved in burning particles as affecting combustion is supported experimentally.</p>}},
  author       = {{Huang, Jianqing and Wu, Zhiyong and Cai, Weiwei and Berrocal, Edouard and Aldén, Marcus and Li, Zhongshan}},
  issn         = {{0032-5910}},
  keywords     = {{Iron particle combustion; Magnified digital holography; Micro-explosion; Particle morphology; Volume expansion}},
  language     = {{eng}},
  month        = {{04}},
  publisher    = {{Elsevier}},
  series       = {{Powder Technology}},
  title        = {{Volume expansion and micro-explosion of combusting iron particles analyzed using magnified holographic imaging}},
  url          = {{http://dx.doi.org/10.1016/j.powtec.2023.118412}},
  doi          = {{10.1016/j.powtec.2023.118412}},
  volume       = {{420}},
  year         = {{2023}},
}