Models of metal ignition

Breiter, A. L.; Mal'tsev, V. M.; Popov, E. O.

doi:10.1007/bf00744795

Cited by 60 publications

(28 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4. We infer that these unformed peaks were due to the formation of AleMg-based amorphous compounds, unlike crystal aluminum hydroxide, which could inhibit the reaction of metal with water due to its dense oxide [9].…”

Section: Hydrolysis Properties and Mechanism Of Mgeal Alloy Materialsmentioning

confidence: 95%

See 1 more Smart Citation

Preparation and characterization of hydro-reactive Mg–Al mechanical alloy materials for hydrogen production in seawater

Zou

Guo

Huang

et al. 2012

Journal of Power Sources

View full text Add to dashboard Cite

Section: Hydrolysis Properties and Mechanism Of Mgeal Alloy Materialsmentioning

confidence: 95%

“…Although Al/H 2 O has higher energy density than the Mg/H 2 O system, it has a lower reactivity because the aluminum oxide film has highly protective properties [9] (PillingeBedworth coefficient…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of hydro-reactive Mg–Al mechanical alloy materials for hydrogen production in seawater

Zou

Guo

Huang

et al. 2012

Journal of Power Sources

View full text Add to dashboard Cite

“…The main feature of laser cutting is the formation of characteristic roughness in the form of periodic striated structures (striations) on the cut surface -wavy protrusions and depressions, which in the literature are often called grooves, strokes, patterns, etc. As the thickness of the material increases, 1 Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Division, Russian Academy of Sciences, Novosibirsk 630090; ermolaev@itam.nsc.ru. the width and depth of the grooves increases and the quality of the surface deteriorates.…”

Section: Introductionmentioning

confidence: 99%

“…The mechanisms of ignition metal have special features [1] due to the high thermal conductivities of metals, the great thermal effect of the reaction, and the phase state of the oxides formed. The surface heating conditions influence the combustion process.…”

Section: Introductionmentioning

confidence: 99%

Modeling of laser-induced combustion of iron in oxygen during gas-laser cutting

Ermolaev

Ковалев

2010

Combust Explos Shock Waves

View full text Add to dashboard Cite

A physical and mathematical model is proposed for cyclic combustion of iron in an oxygen stream during oxygen gas-laser cutting of sheet metal. The combustion front is driven by focused laser radiation and heterogeneous iron oxidation in oxygen. The burning rate is limited by the rate of oxygen supply from the gas phase to the metal surface, and the motion of the interface is determined by the local temperature mode. Three-dimensional numerical modeling revealed striated structures on the metal surface whose linear dimensions depended on velocity of the laser beam and oxygen flow parameters. The modeling results explain the mechanism of striation formation during oxygen gas-laser cutting of low-carbon steel and agree qualitatively with experimental data.

show abstract

“…Such a drastic change can be brought about by layer instability. Breiter et al [6] identified thermodynamic instability as a possible reason for a change in permeability, which would initiate a phase transition either in the oxide layer or in the metal substrate. But it is quite obvious that other reasons are also possible.…”

Section: Introductionmentioning

confidence: 99%

Metal-particle ignition and oxide-layer instability

Meinköhn

2006

Combust Explos Shock Waves

View full text Add to dashboard Cite

The use of metals as high-energy fuel additives is generally compromised by the appearance of a strongly protective oxide layer that covers the fuel surface. The previous work concentrated on the elimination of the oxide layer by a global, symmetryconserving attack, using an admixture of aggressive chemical constituents in the ambient atmosphere, a strong flux of radiation, or strongly shearing gas flows designed to intensely strain the surface layer. This paper shows that symmetry breaking leads to a different approach to ignition. For a liquid oxide layer, destabilization can be obtained via the Marangoni effect associated with longitudinal surface stress, thus breaking the translational symmetry in longitudinal directions. The thermodynamic state of the layer is described in a thin-film model, which leads to a creeping-flow approximation. Ignition by way of the Marangoni effect is then shown to result from spreading of punctures and ruptures in the oxide layer, which is a prerequisite for layer thinning or even complete layer removal. Boron-particle ignition is selected to illustrate the theory, because the well-known difficulties with boron ignitability have greatly impaired the use of boron fuel in propulsion devices. It is shown that, for ambient temperatures below 1634 K, the oxide surface layer can be destabilized by way of punctures and ruptures, owing to the peculiar property of the boron oxide, namely, positive Marangoni numbers. Previous models of boron-particle ignition insisted on conservation of symmetry and expressly excluded the appearance of punctures and ruptures. Because of this constraint, a critical ambient temperature of 1900 K for boron ignition was obtained, so that the new value of 1634 K opens up a novel approach to ignition.

show abstract

Models of metal ignition

Cited by 60 publications

References 10 publications

Preparation and characterization of hydro-reactive Mg–Al mechanical alloy materials for hydrogen production in seawater

Preparation and characterization of hydro-reactive Mg–Al mechanical alloy materials for hydrogen production in seawater

Modeling of laser-induced combustion of iron in oxygen during gas-laser cutting

Metal-particle ignition and oxide-layer instability

Contact Info

Product

Resources

About