Combustion wave propagation in magnesium/water mixtures: Experiments and model

Diwan, Moiz; Hanna, David; Shafirovich, Evgeny; Varma, Arvind

doi:10.1016/j.ces.2009.01.069

Cited by 34 publications

(8 citation statements)

References 18 publications

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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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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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“…Aluminum/water propellant, which is a combination of solid energetic metal powder as fuel and water as oxidizing agent, [1][2][3] has gained extensive attention in the eld of underwater propulsion applications due to its high energy density and nontoxic combustion products. 4,5 At the same time, it will be potentially applied to novel propulsion systems in the future.…”

Section: Introductionmentioning

confidence: 99%

The effects of additives on the combustion characteristics of aluminum powder in steam

Zhu

Wang

et al. 2017

RSC Adv.

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“…This is different from DOE (Department of Energy, USA) which uses a tank system based concept for calculating the energy density values. What's more, Fan et al 3,26 examined the effects of metal Li addition on the hydrolysis of Al. In order to activate Al and improve its hydrolysis properties, much work has been carried out.…”

Section: Introductionmentioning

confidence: 99%

“…Alinejad et al 25 composite could reach a hydrogen yield of 100% within 40 min when the salt to aluminum molar ration was set at 1.5. What's more, Fan et al 3,26 examined the effects of metal Li addition on the hydrolysis of Al. The optimized Al-Bi-Li alloy could release 1340 mL H 2 at 298 K with 100% efficiency with a hydrogen generation rate of 998 mL min À1 .…”

Section: Introductionmentioning

confidence: 99%

Study on hydrogen generation from the hydrolysis of a ball milled aluminum/calcium hydride composite

et al. 2015

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Metal Al was ball milled with CaH 2 to improve its hydrolysis properties. The effects of reaction temperature and milling conditions on the hydrogen generation performances of Al are investigated. A higher temperature has been shown to be beneficial for the hydrolysis of Al-CaH 2 composites. With increasing the added amount of CaH 2 and milling time, the grain size of Al is decreased and the protective oxide film on the surface of the Al powder is damaged. The hydrolysis of CaH 2 helps to open up the structure of Al grains and provide OH À to enhance the corrosion of Al. As a result, the hydrogen production of Al powder has been greatly optimized, and the addition of CaH 2 proves to be more effective than the addition of some other hydrides. The yield and maximum hydrogen generation rate (mHGR) of an Al-10 mol% CaH 2 mixture milled for 15 h are 97.8% and 2074.3 mL min À1 g À1 , respectively.

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Combustion wave propagation in magnesium/water mixtures: Experiments and model

Cited by 34 publications

References 18 publications

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

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

The effects of additives on the combustion characteristics of aluminum powder in steam

Study on hydrogen generation from the hydrolysis of a ball milled aluminum/calcium hydride composite

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