Volume expansion and micro-explosion of combusting iron particles analyzed using magnified holographic imaging
(2023) In Powder Technology 420.- Abstract
In-situ characterization of combusting iron particles is of great importance for understanding the combustion mechanism. Here, magnified holographic imaging is employed to investigate the transient morphology and dynamics of iron particles during combustion. The volume expansion behavior of combusting particles (mean diameter: 85 μm) is observed in situ. The particle volume increases to eight times of its initial volume within 0.14 ms, indicating that a hollow structure is generated due to bubbles formation inside the particle. In addition, the micro-explosion behaviors of expanded and unexpanded particles are resolved with high spatiotemporal resolutions. The ratio between the overall volume of the fragments (after explosion) and the... (More)
In-situ characterization of combusting iron particles is of great importance for understanding the combustion mechanism. Here, magnified holographic imaging is employed to investigate the transient morphology and dynamics of iron particles during combustion. The volume expansion behavior of combusting particles (mean diameter: 85 μm) is observed in situ. The particle volume increases to eight times of its initial volume within 0.14 ms, indicating that a hollow structure is generated due to bubbles formation inside the particle. In addition, the micro-explosion behaviors of expanded and unexpanded particles are resolved with high spatiotemporal resolutions. The ratio between the overall volume of the fragments (after explosion) and the volume of the expanded particle (before explosion) is around 0.2, which further validates the existence of the gas bubbles. Finally, based on the observed evolution of particle morphology, a hypothesis exploring the release of gases dissolved in burning particles as affecting combustion is supported experimentally.
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- author
- Huang, Jianqing LU ; Wu, Zhiyong LU ; Cai, Weiwei ; Berrocal, Edouard LU ; Aldén, Marcus LU and Li, Zhongshan LU
- organization
- publishing date
- 2023-04-15
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Iron particle combustion, Magnified digital holography, Micro-explosion, Particle morphology, Volume expansion
- in
- Powder Technology
- volume
- 420
- article number
- 118412
- publisher
- Elsevier
- external identifiers
-
- scopus:85149960217
- ISSN
- 0032-5910
- DOI
- 10.1016/j.powtec.2023.118412
- language
- English
- LU publication?
- yes
- additional info
- Publisher Copyright: © 2023 Elsevier B.V.
- id
- bddbd7e5-5900-4a81-9742-72ac41342ab9
- date added to LUP
- 2023-03-31 11:57:16
- date last changed
- 2023-11-17 17:37:25
@article{bddbd7e5-5900-4a81-9742-72ac41342ab9, abstract = {{<p>In-situ characterization of combusting iron particles is of great importance for understanding the combustion mechanism. Here, magnified holographic imaging is employed to investigate the transient morphology and dynamics of iron particles during combustion. The volume expansion behavior of combusting particles (mean diameter: 85 μm) is observed in situ. The particle volume increases to eight times of its initial volume within 0.14 ms, indicating that a hollow structure is generated due to bubbles formation inside the particle. In addition, the micro-explosion behaviors of expanded and unexpanded particles are resolved with high spatiotemporal resolutions. The ratio between the overall volume of the fragments (after explosion) and the volume of the expanded particle (before explosion) is around 0.2, which further validates the existence of the gas bubbles. Finally, based on the observed evolution of particle morphology, a hypothesis exploring the release of gases dissolved in burning particles as affecting combustion is supported experimentally.</p>}}, author = {{Huang, Jianqing and Wu, Zhiyong and Cai, Weiwei and Berrocal, Edouard and Aldén, Marcus and Li, Zhongshan}}, issn = {{0032-5910}}, keywords = {{Iron particle combustion; Magnified digital holography; Micro-explosion; Particle morphology; Volume expansion}}, language = {{eng}}, month = {{04}}, publisher = {{Elsevier}}, series = {{Powder Technology}}, title = {{Volume expansion and micro-explosion of combusting iron particles analyzed using magnified holographic imaging}}, url = {{http://dx.doi.org/10.1016/j.powtec.2023.118412}}, doi = {{10.1016/j.powtec.2023.118412}}, volume = {{420}}, year = {{2023}}, }