Spatiotemporal quantification of AlO around a burning micro-sized Al droplet using laser absorption imaging
Wang, Weitian LU ; Wu, Zhiyong LU
; 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.
(Less)
- author
- Wang, Weitian
LU
; Wu, Zhiyong
LU
; Chao, Xing
; Aldén, Marcus
LU
and Li, Zhongshan
LU
- organization
- publishing date
- 2025-12
- 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
- 2025-10-06 10:59:58
@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}},
}