Numerical simulation of the ignition of aluminum nanoparticles in oxygen-containing gases taking into consideration polymorphic transformations in an oxide film

Савельев, А. М.; Yagodnikov, D. A.

doi:10.1016/j.combustflame.2023.112777

Cited by 2 publications

(1 citation statement)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Sundaram [20] established a general theory for the ignition and combustion of Al particles at the nano-and micrometer scale, and concluded that the cracking of the alumina shells is a result of a combination of internal stresses and crystal transformation. Savel'ev [21] developed a model to investigate the role of polycrystalline transformation of Al nanoparticles in the ignition process. The results showed that the polycrystalline transformation of amorphous alumina to γ-alumina always precedes the ignition of nanoparticles, and the ignition of particles occurs after the cracks of γ-alumina films heal during the growth phase, while the polycrystalline transformation of γ-oxides to α-oxides does not have a significant effect on the ignition of nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Study on the Size Dependence of the Shell-Breaking Response of Micro/Nano Al Particles at High Temperature

Zhou,

Chai,

Wang

et al. 2024

Nanomaterials

View full text Add to dashboard Cite

The reactivity of Al nanoparticles is significantly higher than that of micron Al particles, and the thermal reaction properties exhibit notable distinctions. Following the previous studies on micron Al particles, the shell-breaking response of Al nanoparticles under vacuum conditions was analyzed using COMSOL simulation. Relationships between thermal stabilization time, shell-breaking cause, shell-breaking response time, and particle size were obtained, and a systematic analysis of the differences between micrometer and nanometer-sized particles was conducted. The results indicate that the thermal stabilization time of both micrometer and nanometer particles increases with the enlargement of particle size. The stress generated by heating Al nanoparticles with sizes ranging from 25–100 nm is insufficient to rupture the outer shell. For particles within the size range of 200 nm to 70 μm, the primary cause of shell-breaking is compressive stress overload, while particles in the range of 80–100 μm experience shell rupture primarily due to tensile stress overload. These results provide an important basis for understanding the shell-breaking mechanism of microns and nanoparticles of Al and studying the oxidation mechanism.

show abstract

Section: Introductionmentioning

confidence: 99%