Modeling of micron-sized aluminum particle combustion in hot gas flow
(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.
(Less)
- author
- organization
- publishing date
- 2024-08-01
- 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}}, }