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Modeling of micron-sized aluminum particle combustion in hot gas flow

Feng, S. LU ; Qiu, Y. LU ; Xu, S. LU orcid ; Wu, Z. LU ; Ruan, C. LU ; Roth, A. LU ; Nilsson, E. LU orcid ; Berrocal, E. LU ; Li, Z. S. LU and Alden, M. LU , et al. (2024) In Fuel 369.
Abstract

This paper presents a model for micron-sized aluminum (Al) particle combustion in hot oxidizing environments, forming hollow spheres. The model comprises four sub-models describing the physical and chemical processes during Al combustion: melting of the solid core, ejection of liquid Al droplets from the breaking solid shell, vaporization of liquid droplets, and ignition and establishment of vapor flame surrounding the solid particles. The model is of critical importance when the ambient gas temperature is higher than the melting point of the Al core, Tc,m, but lower than the alumina (Al2O3) shell's melting point, Ts,m. In the model, the Al core is assumed to be surrounded by a thin, compact... (More)

This paper presents a model for micron-sized aluminum (Al) particle combustion in hot oxidizing environments, forming hollow spheres. The model comprises four sub-models describing the physical and chemical processes during Al combustion: melting of the solid core, ejection of liquid Al droplets from the breaking solid shell, vaporization of liquid droplets, and ignition and establishment of vapor flame surrounding the solid particles. The model is of critical importance when the ambient gas temperature is higher than the melting point of the Al core, Tc,m, but lower than the alumina (Al2O3) shell's melting point, Ts,m. In the model, the Al core is assumed to be surrounded by a thin, compact alumina shell that blocks the diffusion of oxidizer into the core and prevents surface reactions. The alumina shell's cracking and liquid Al's eruption are triggered by thermal expansion and pressure buildup in the liquid core. The splashed liquid Al droplets vaporize quickly and initiate gas-phase reactions, followed by the vaporization of the liquid Al core as the particle temperature Tp increases. Al vapor combustion heat is redistributed to simulate the gaseous flame near the particle. The model is implemented using the Lagrangian particle tracking method and is validated through simulations of micron-sized Al particle combustion in hot gas and comparison with experiments. The results can explain the formation of the sharp-edged holes on hollow aluminum oxide spheres and the ignition behavior observed in the experiments.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Aluminum particle, Melt-ejection model, Metal combustion, Reaction heat redistribution, Sharp-edged holes, Vaporization
in
Fuel
volume
369
article number
131718
publisher
Elsevier
external identifiers
  • scopus:85191346688
ISSN
0016-2361
DOI
10.1016/j.fuel.2024.131718
language
English
LU publication?
yes
id
7acd9729-74c4-41d0-b9a6-f04a8bf37b15
date added to LUP
2024-05-07 10:24:16
date last changed
2024-05-07 10:25:06
@article{7acd9729-74c4-41d0-b9a6-f04a8bf37b15,
  abstract     = {{<p>This paper presents a model for micron-sized aluminum (Al) particle combustion in hot oxidizing environments, forming hollow spheres. The model comprises four sub-models describing the physical and chemical processes during Al combustion: melting of the solid core, ejection of liquid Al droplets from the breaking solid shell, vaporization of liquid droplets, and ignition and establishment of vapor flame surrounding the solid particles. The model is of critical importance when the ambient gas temperature is higher than the melting point of the Al core, T<sub>c,m</sub>, but lower than the alumina (Al<sub>2</sub>O<sub>3</sub>) shell's melting point, T<sub>s,m</sub>. In the model, the Al core is assumed to be surrounded by a thin, compact alumina shell that blocks the diffusion of oxidizer into the core and prevents surface reactions. The alumina shell's cracking and liquid Al's eruption are triggered by thermal expansion and pressure buildup in the liquid core. The splashed liquid Al droplets vaporize quickly and initiate gas-phase reactions, followed by the vaporization of the liquid Al core as the particle temperature T<sub>p</sub> increases. Al vapor combustion heat is redistributed to simulate the gaseous flame near the particle. The model is implemented using the Lagrangian particle tracking method and is validated through simulations of micron-sized Al particle combustion in hot gas and comparison with experiments. The results can explain the formation of the sharp-edged holes on hollow aluminum oxide spheres and the ignition behavior observed in the experiments.</p>}},
  author       = {{Feng, S. and Qiu, Y. and Xu, S. and Wu, Z. and Ruan, C. and Roth, A. and Nilsson, E. and Berrocal, E. and Li, Z. S. and Alden, M. and Bai, X. S.}},
  issn         = {{0016-2361}},
  keywords     = {{Aluminum particle; Melt-ejection model; Metal combustion; Reaction heat redistribution; Sharp-edged holes; Vaporization}},
  language     = {{eng}},
  month        = {{08}},
  publisher    = {{Elsevier}},
  series       = {{Fuel}},
  title        = {{Modeling of micron-sized aluminum particle combustion in hot gas flow}},
  url          = {{http://dx.doi.org/10.1016/j.fuel.2024.131718}},
  doi          = {{10.1016/j.fuel.2024.131718}},
  volume       = {{369}},
  year         = {{2024}},
}