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Detailed numerical simulation and experiments of a steadily burning micron-sized aluminum droplet in hot steam-dominated flows

Qiu, Yue LU ; Feng, Sheng LU ; Wu, Zhiyong LU orcid ; Xu, Shijie LU orcid ; Ruan, Can LU ; Bai, Xue Song LU ; Nilsson, Elna J.K. LU orcid ; Aldén, Marcus LU and Li, Zhongshan LU (2024) In Proceedings of the Combustion Institute 40(1-4).
Abstract

Detailed numerical simulations are conducted in comparison with experimental results to study the flame structure and burning rate of a steadily burning aluminum droplet in hot steam-dominated environments. The droplet surface temperature, flame temperature, and flame stabilization position are measured along with the droplet burning rate estimated from the droplet size evolution. A numerical model accounting for detailed transport properties and chemical kinetics is presented and applied to unveil the flame structure, species and temperature distributions, and heat/mass transfer between the droplet and the surrounding gas. The numerical results of the temperature, velocity, and species distribution profiles demonstrate that the... (More)

Detailed numerical simulations are conducted in comparison with experimental results to study the flame structure and burning rate of a steadily burning aluminum droplet in hot steam-dominated environments. The droplet surface temperature, flame temperature, and flame stabilization position are measured along with the droplet burning rate estimated from the droplet size evolution. A numerical model accounting for detailed transport properties and chemical kinetics is presented and applied to unveil the flame structure, species and temperature distributions, and heat/mass transfer between the droplet and the surrounding gas. The numerical results of the temperature, velocity, and species distribution profiles demonstrate that the aluminum vapor flame is of classical diffusion flame structure, where near the droplet, there is a non-negligible amount of AlOAl apart from the main product Al2O3(l). This supports the deposition and formation of an alumina cap on the surface proposed in the literature. The simulation correctly captured the flame temperature and flame stabilization distance for a range of droplet sizes. Net heat flux analysis shows that conduction heat from the flame front accounts for less than 30% of the heat needed in aluminum evaporation, which warrants further quantification on other heat sources. The experimental and numerical results enrich the knowledge of the heat/mass transfer and chemical reactions near the droplet, which helps deepen the understanding of aluminum droplet burning.

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author
; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Direct numerical simulation, Eulerian-based framework, Flame structure, Metal combustion, Micron-sized aluminum droplet
in
Proceedings of the Combustion Institute
volume
40
issue
1-4
article number
105717
pages
7 pages
publisher
Elsevier
external identifiers
  • scopus:85201709720
ISSN
1540-7489
DOI
10.1016/j.proci.2024.105717
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2024 The Author(s)
id
8b07009d-fa57-4833-8d0e-29fc926f38e0
date added to LUP
2024-10-27 16:49:44
date last changed
2025-04-04 14:43:30
@article{8b07009d-fa57-4833-8d0e-29fc926f38e0,
  abstract     = {{<p>Detailed numerical simulations are conducted in comparison with experimental results to study the flame structure and burning rate of a steadily burning aluminum droplet in hot steam-dominated environments. The droplet surface temperature, flame temperature, and flame stabilization position are measured along with the droplet burning rate estimated from the droplet size evolution. A numerical model accounting for detailed transport properties and chemical kinetics is presented and applied to unveil the flame structure, species and temperature distributions, and heat/mass transfer between the droplet and the surrounding gas. The numerical results of the temperature, velocity, and species distribution profiles demonstrate that the aluminum vapor flame is of classical diffusion flame structure, where near the droplet, there is a non-negligible amount of AlOAl apart from the main product Al<sub>2</sub>O<sub>3</sub>(l). This supports the deposition and formation of an alumina cap on the surface proposed in the literature. The simulation correctly captured the flame temperature and flame stabilization distance for a range of droplet sizes. Net heat flux analysis shows that conduction heat from the flame front accounts for less than 30% of the heat needed in aluminum evaporation, which warrants further quantification on other heat sources. The experimental and numerical results enrich the knowledge of the heat/mass transfer and chemical reactions near the droplet, which helps deepen the understanding of aluminum droplet burning.</p>}},
  author       = {{Qiu, Yue and Feng, Sheng and Wu, Zhiyong and Xu, Shijie and Ruan, Can and Bai, Xue Song and Nilsson, Elna J.K. and Aldén, Marcus and Li, Zhongshan}},
  issn         = {{1540-7489}},
  keywords     = {{Direct numerical simulation; Eulerian-based framework; Flame structure; Metal combustion; Micron-sized aluminum droplet}},
  language     = {{eng}},
  number       = {{1-4}},
  publisher    = {{Elsevier}},
  series       = {{Proceedings of the Combustion Institute}},
  title        = {{Detailed numerical simulation and experiments of a steadily burning micron-sized aluminum droplet in hot steam-dominated flows}},
  url          = {{http://dx.doi.org/10.1016/j.proci.2024.105717}},
  doi          = {{10.1016/j.proci.2024.105717}},
  volume       = {{40}},
  year         = {{2024}},
}