Experimental investigation on the ignition and combustion characteristics of moving micron-sized Mg particles in CO2

Zhu, Xiaofei; Li, Chao; Guo, Yu; Ao, Wen; Liu, Shining; Hu, Chunbo

doi:10.1016/j.actaastro.2020.01.008

Cited by 19 publications

(2 citation statements)

References 26 publications

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“…Furthermore, nano-sized aluminum exhibited more intense combustion dynamics and superior self-sustaining performance characteristics relative to their microsized counterparts [14]. Conversely, escalations in ambient temperature or oxygen content not only showed reductions in the ignition delay time of the particles but also exerted an influence on the combustion time [18,19]. Although aluminum nanoparticles exhibit lower ignition temperature thresholds in comparison to their micro-sized counterparts, they also exhibit a propensity for sintering and agglomeration due to solid-state diffusion and viscous flow phenomena [20].…”

Section: Ignition and Combustion Of Metal And Metalloid Particlesmentioning

confidence: 99%

Hot Bridge-Wire Ignition of Nanocomposite Aluminum Thermite Synthesized Using Sol-Gel-Derived Aerogel with Tailored Properties for Enhanced Reactivity and Reduced Sensitivity

Ghedjatti,

Yuan,

Wang

2024

Energies

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The development of nano-energetic materials has significantly advanced, leading to enhanced properties and novel applications in areas such as aerospace, defense, energy storage, and automobile. This research aims to engineer multi-dimensional nano-energetic material systems with precise control over energy release rates, spatial distribution, and temporal and pressure history. In this context, sol–gel processing has been explored for the manufacture of nanocomposite aluminum thermites using aerogels. The goal is to produce nano-thermites (Al/Fe2O3) with fast energy release rates that are insensitive to unintended initiation while demonstrating the potential of sol–gel-derived aerogels in terms of versatility, tailored properties, and compatibility. The findings provide insightful conclusions on the influence of factors such as secondary oxidizers (KClO3) and dispersants (n-hexane and acetone) on the reaction kinetics and the sensitivity, playing crucial roles in determining reactivity and combustion performance. In tandem, ignition systems contribute significantly in terms of a high degree of reliability and speed. However, the advantages of using nano-thermites combined with hot bridge-wire systems in terms of ignition and combustion efficiency for potential, practical applications are not well-documented in the literature. Thus, this research also highlights the practicality along with safety and simplicity of use, making nano-Al/Fe2O3-KClO3 in combination with hot bridge-wire ignition a suitable choice for experimental purposes and beyond.

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Section: Ignition and Combustion Of Metal And Metalloid Particlesmentioning

confidence: 99%

Hot Bridge-Wire Ignition of Nanocomposite Aluminum Thermite Synthesized Using Sol-Gel-Derived Aerogel with Tailored Properties for Enhanced Reactivity and Reduced Sensitivity

Ghedjatti,

Yuan,

Wang

2024

Energies

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“…Cassel et al [7] experimentally presented that the burn time of Mg microparticles in pure O 2 was one tenth of that in air, suggesting that the combustion of Mg in air was controlled by the diffusion rate of oxygen component, whereas it controlled by the vaporization rate of Mg vapor in pure O 2 . In high-temperature H 2 O [8][9][10] or CO/CO 2 [11][12][13][14][15][16], despite millimeter-sized or micron-sized Mg particles, they both underwent gas phase combustion, and the only difference that existed was in terms of burn time. Gaseous combustion was related to the pressure of oxidizing atmospheres [17,18].…”

Section: Introductionmentioning

confidence: 99%

Vaporization, Diffusion and Combustion of Laser-Induced Individual Magnesium Microparticles in Inert and Oxidizing Atmospheres

Yang

Lin

et al. 2021

Processes

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Although the gas phase combustion of metallic magnesium (Mg) has been extensively studied, the vaporization and diffusive combustion behaviors of Mg have not been well characterized. This paper proposes an investigation of the vaporization, diffusion, and combustion characteristics of individual Mg microparticles in inert and oxidizing gases by a self-built experimental setup based on laser-induced heating and microscopic high-speed cinematography. Characteristic parameters like vaporization and diffusion coefficients, diffusion ratios, flame propagation rates, etc., were obtained at high spatiotemporal resolutions (μm and tens of μs), and their differences in inert gases (argon, nitrogen) and in oxidizing gases (air, pure oxygen) were comparatively analyzed. More importantly, for the core–shell structure, during vaporization, a shock wave effect on the cracking of the porous magnesium oxide thin film shell-covered Mg core was first experimentally revealed in inert gases. In air, the combustion flame stood over the Mg microparticles, and the heterogeneous combustion reaction was controlled by the diffusion rate of oxygen in air. While in pure O2, the vapor-phase stand-off flame surrounded the Mg microparticles, and the reaction was dominated by the diffusion rate of Mg vapor. The diffusion coefficients of the Mg vapor in oxidizing gases are 1~2 orders of magnitude higher than those in inert gases. However, the diffusive ratios of condensed combustion residues in oxidizing gases are ~1/2 of those in inert gases. The morphology and the constituent contents analysis showed that argon would not dissolve into liquid Mg, while nitrogen would significantly dissolve into liquid Mg. In oxidizing gases of air or pure O2, Mg microparticles in normal pressure completely burned due to laser-induced heating.

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Lithium and Magnesium Fuels for Space Propulsion and Power

Shafirovich¹

2023

Nano and Micro‐Scale Energetic Materials

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Experimental investigation on the ignition and combustion characteristics of moving micron-sized Mg particles in CO2

Cited by 19 publications

References 26 publications

Hot Bridge-Wire Ignition of Nanocomposite Aluminum Thermite Synthesized Using Sol-Gel-Derived Aerogel with Tailored Properties for Enhanced Reactivity and Reduced Sensitivity

Hot Bridge-Wire Ignition of Nanocomposite Aluminum Thermite Synthesized Using Sol-Gel-Derived Aerogel with Tailored Properties for Enhanced Reactivity and Reduced Sensitivity

Vaporization, Diffusion and Combustion of Laser-Induced Individual Magnesium Microparticles in Inert and Oxidizing Atmospheres

Lithium and Magnesium Fuels for Space Propulsion and Power

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