Combustion of aluminum nanoparticle agglomerates: From mild oxidation to microexplosion

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Combustion of aluminum nanoparticle agglomerates : From mild oxidation to microexplosion. / Tang, Yong; Kong, Chengdong; Zong, Yichen; Li, Shuiqing; Zhuo, Jiankun; Yao, Qiang.

In: Proceedings of the Combustion Institute, 2017, p. 2325–2332.

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Tang, Yong ; Kong, Chengdong ; Zong, Yichen ; Li, Shuiqing ; Zhuo, Jiankun ; Yao, Qiang. / Combustion of aluminum nanoparticle agglomerates : From mild oxidation to microexplosion. In: Proceedings of the Combustion Institute. 2017 ; pp. 2325–2332.

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TY - JOUR

T1 - Combustion of aluminum nanoparticle agglomerates

T2 - Proceedings of the Combustion Institute

AU - Tang, Yong

AU - Kong, Chengdong

AU - Zong, Yichen

AU - Li, Shuiqing

AU - Zhuo, Jiankun

AU - Yao, Qiang

PY - 2017

Y1 - 2017

N2 - While the nano-sized energetic materials are featured with ultra-high energy density, the ubiquitous agglomeration in their combustion is still unexplored. In this paper, the combustion characteristics of aluminum nanoparticle agglomerates in the size range of 4-20μm are investigated on a modified Hencken burner with different temperature (800-1800K) and oxygen concentration (0.5-5.5mol/m3). Due to the heat accumulation effect of the designed porous structures, the nanoparticle agglomerates even maintain the advantages of combustion process of single nanoparticle in terms of a low ignition temperature (∼800K) and a fast energy release rate. Further, the combustion of agglomerates is numerically studied by a newly-developed model, which accurately predicts both burn time and temperature of agglomerate of the mild combustion process. The microexplosion phenomenon occurs when the oxygen concentration exceeds 3.5mol/m3. Measurements of particle temperature, burn time, emission spectra and morphologies indicate that this explosion is driven by the vaporization of unreacted aluminum core, which results in huge stresses to tear the Al/Al2O3 particle into many smaller, dispersed clusters. Thus a melt/vapor dispersion mechanism (MVDM) based on melt dispersion mechanism is proposed to cover the microexplosion and subsequent accelerated oxidation reactions.

AB - While the nano-sized energetic materials are featured with ultra-high energy density, the ubiquitous agglomeration in their combustion is still unexplored. In this paper, the combustion characteristics of aluminum nanoparticle agglomerates in the size range of 4-20μm are investigated on a modified Hencken burner with different temperature (800-1800K) and oxygen concentration (0.5-5.5mol/m3). Due to the heat accumulation effect of the designed porous structures, the nanoparticle agglomerates even maintain the advantages of combustion process of single nanoparticle in terms of a low ignition temperature (∼800K) and a fast energy release rate. Further, the combustion of agglomerates is numerically studied by a newly-developed model, which accurately predicts both burn time and temperature of agglomerate of the mild combustion process. The microexplosion phenomenon occurs when the oxygen concentration exceeds 3.5mol/m3. Measurements of particle temperature, burn time, emission spectra and morphologies indicate that this explosion is driven by the vaporization of unreacted aluminum core, which results in huge stresses to tear the Al/Al2O3 particle into many smaller, dispersed clusters. Thus a melt/vapor dispersion mechanism (MVDM) based on melt dispersion mechanism is proposed to cover the microexplosion and subsequent accelerated oxidation reactions.

KW - Agglomerates

KW - Al nanoparticles

KW - Melt/vapor dispersion mechanism

KW - Microexplosion

UR - http://www.scopus.com/inward/record.url?scp=85003683090&partnerID=8YFLogxK

U2 - 10.1016/j.proci.2016.06.144

DO - 10.1016/j.proci.2016.06.144

M3 - Article

SP - 2325

EP - 2332

JO - Proceedings of the Combustion Institute

JF - Proceedings of the Combustion Institute

SN - 1540-7489

ER -