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Spatiotemporal quantification of AlO around a burning micro-sized Al droplet using laser absorption imaging

Wang, Weitian LU ; Wu, Zhiyong LU orcid ; Chao, Xing ; Aldén, Marcus LU and Li, Zhongshan LU (2025) In Combustion and Flame 282.
Abstract

By combining the quantitative advantage of laser absorption spectroscopy and the superior spatiotemporal resolution of high-speed microscopic imaging, we report, for the first time, the transient aluminum monoxide (AlO) concentration distribution around a burning micro-sized aluminum droplet in water-vapor-rich ambient. Arrangement of two lasers at resonant and non-resonant wavelengths, respectively, eliminates the non-resonant extinction interference from condensed-phase products. The AlO concentrations are found to increase as the combustion proceeds and reach a plateau approximately 10 ms after ignition. The AlO concentration increases from a negligible level near the droplet surface to a peak within the condensed layer, decreases,... (More)

By combining the quantitative advantage of laser absorption spectroscopy and the superior spatiotemporal resolution of high-speed microscopic imaging, we report, for the first time, the transient aluminum monoxide (AlO) concentration distribution around a burning micro-sized aluminum droplet in water-vapor-rich ambient. Arrangement of two lasers at resonant and non-resonant wavelengths, respectively, eliminates the non-resonant extinction interference from condensed-phase products. The AlO concentrations are found to increase as the combustion proceeds and reach a plateau approximately 10 ms after ignition. The AlO concentration increases from a negligible level near the droplet surface to a peak within the condensed layer, decreases, and spreads beyond it. The maximum molar concentration observed over time reaches approximately 2%. The proposed method enables high spatiotemporally resolved inspection of AlO species, offering a powerful diagnostic tool for further insights into the mechanism of Al combustion process. Novelty and significance statement High spatiotemporally resolved AlO distribution around a burning micro-sized aluminum droplet is obtained quantitatively for the first time using high-speed laser absorption imaging. Two lasers at resonant and non-resonant wavelengths, respectively, eliminate the non-resonant extinction interference from condensed-phase products. The proposed experimental system can readily provide instantaneous AlO concentration data for mechanism and modeling studies of Al combustion.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Aluminum combustion, Aluminum monoxide detection, Laser absorption imaging, Metal combustion
in
Combustion and Flame
volume
282
article number
114472
publisher
Elsevier
external identifiers
  • scopus:105016757733
ISSN
0010-2180
DOI
10.1016/j.combustflame.2025.114472
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2025 The Authors
id
591ec8e3-7d9a-4df0-a427-9233d4da0495
date added to LUP
2025-10-05 20:05:53
date last changed
2025-10-14 09:15:57
@article{591ec8e3-7d9a-4df0-a427-9233d4da0495,
  abstract     = {{<p>By combining the quantitative advantage of laser absorption spectroscopy and the superior spatiotemporal resolution of high-speed microscopic imaging, we report, for the first time, the transient aluminum monoxide (AlO) concentration distribution around a burning micro-sized aluminum droplet in water-vapor-rich ambient. Arrangement of two lasers at resonant and non-resonant wavelengths, respectively, eliminates the non-resonant extinction interference from condensed-phase products. The AlO concentrations are found to increase as the combustion proceeds and reach a plateau approximately 10 ms after ignition. The AlO concentration increases from a negligible level near the droplet surface to a peak within the condensed layer, decreases, and spreads beyond it. The maximum molar concentration observed over time reaches approximately 2%. The proposed method enables high spatiotemporally resolved inspection of AlO species, offering a powerful diagnostic tool for further insights into the mechanism of Al combustion process. Novelty and significance statement High spatiotemporally resolved AlO distribution around a burning micro-sized aluminum droplet is obtained quantitatively for the first time using high-speed laser absorption imaging. Two lasers at resonant and non-resonant wavelengths, respectively, eliminate the non-resonant extinction interference from condensed-phase products. The proposed experimental system can readily provide instantaneous AlO concentration data for mechanism and modeling studies of Al combustion.</p>}},
  author       = {{Wang, Weitian and Wu, Zhiyong and Chao, Xing and Aldén, Marcus and Li, Zhongshan}},
  issn         = {{0010-2180}},
  keywords     = {{Aluminum combustion; Aluminum monoxide detection; Laser absorption imaging; Metal combustion}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Combustion and Flame}},
  title        = {{Spatiotemporal quantification of AlO around a burning micro-sized Al droplet using laser absorption imaging}},
  url          = {{http://dx.doi.org/10.1016/j.combustflame.2025.114472}},
  doi          = {{10.1016/j.combustflame.2025.114472}},
  volume       = {{282}},
  year         = {{2025}},
}