Triggering steam explosions of single drops of a molten ferrosilicon alloy with a simple encapsulated mechanical impactor

Nelson, Lloyd S.; Brooks, Paul; Bonazza, Riccardo; Corradini, Michael L.

doi:10.1007/s11663-999-0114-6

Cited by 4 publications

(4 citation statements)

References 10 publications

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“…One possible application of our results is to the solidification of metallurgical grade silicon, as explained in previous work (Benham et al, 2016;Brosa Planella et al, 2019). Amongst the various casting techniques used in the silicon industry, we focus here on the water granulation process, in which liquid silicon is solidified into small spherical particles by quenching the molten silicon in a pool of water (Nelson et al, 2005;Nygaard et al, 1995). Such a process can be described by the model (2.2).…”

Section: Comparison With Experimentsmentioning

confidence: 84%

Extended Stefan problem for the solidification of binary alloys in a sphere

2020

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We study the extended Stefan problem which includes constitutional supercooling for the solidification of a binary alloy in a finite spherical domain. We perform an asymptotic analysis in the limits of large Lewis number and small Stefan number which allows us to identify a number of spatio-temporal regimes signifying distinct behaviours in the solidification process, resulting in an intricate boundary layer structure. Our results generalise those present in the literature by considering all time regimes for the Stefan problem while also accounting for impurities and constitutional supercooling. These results also generalise recent work on the extended Stefan problem for finite planar domains to spherical domains, and we shall highlight key differences in the asymptotic solutions and the underlying boundary layer structure which result from this change in geometry. We compare our asymptotic solutions with both numerical simulations and real experimental data arising from the casting of molten metallurgical grade silicon through the water granulation process, with our analysis highlighting the role played by supercooling in the solidification of binary alloys appearing in such applications.

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Section: Comparison With Experimentsmentioning

confidence: 84%

Extended Stefan problem for the solidification of binary alloys in a sphere

2020

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“…On larger scales, other complications of mixing dynamics and heterogeneities may become important. The trigger event starting phase (2) establishes direct melt to liquid water contact by rapid elimination of film boiling conditions at the interface, which in turn drastically increases the melt to water heat flux (Henry & Fauske, 1979;Nelson et al, 1999;Zimanowski et al, 1995). Under direct contact between liquid fuel and liquid coolant, the process is governed by the thermo-mechanical properties such as density, compressibility, and critical stresses of the liquid phases of involved materials.…”

Section: 1029/2018jb015682mentioning

confidence: 99%

Meter-Scale Experiments on Magma-Water Interaction

Sonder

Harp

Graettinger

et al. 2019

Preprint

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Interaction of magma with groundwater or surface water can lead to explosive phreatomagmatic eruptions. Questions of this process center on effects of system geometry and length and time scales, and these necessitate experiments at larger scale than previously conducted in order to investigate the thermohydraulic escalation behavior of rapid heat transfer. Previous experimental work either realized melt-water interaction at similar meter scales, using a thermite-based magma analog in a confining vessel, or on smaller scale using ≃0.4 kg remelted volcanic rock in an open crucible, with controlled premix and a ≃5 J kinetic energy trigger event. The new setup uses 55 kg melt for interaction, and the timing and location of the magma-water premix can be controlled on a scale up to 1 m. A trigger mechanism is a falling hammer that drives a plunger into the melt (≃28 J kinetic energy). Results show intense interaction (L max ≥ 0.25 m 2 ) at relatively low magma/water mass ratio. A video analysis quantifies rate and amount of melt ejection and compares results with those using the same melt in the smaller scale setup. Experiments show that on the meter scale intense interaction can start spontaneously without an external trigger if the melt column above the initial mixing location is larger than 0.3 m. Experiments suggest that buoyant rise of water domains in a melt column could promote explosive interaction. We assess interaction scenarios between introduced water domains and a magma column, some of which could result in eruptions of Strombolian style, promoting brecciation and incorporation of wall rock debris into a magma column.

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“…Furuya et al 1 used lead and bismuth alloys to study the effect of the oxide layer produced on the surface in terms of vapor explosion. Nelson et al 19 conducted an experiment by mixing 25% iron and 75% silicon. In addition, Hassan et al 20 researched the vapor explosion phenomenon by changing the molar ratio of tungsten trioxide and calcium oxide binary oxide.…”

Section: Introductionmentioning

confidence: 99%

Vapor explosion in steel mill industries: Chemical composition analysis on molten slag and coolant

Cho

Park

Chae

et al. 2020

Process Safety Progress

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It is important to prevent vapor explosion for steel mill industries for the reason that explosions can produce overpressure which cause buildings and facilities to rupture.The spontaneous vapor explosion occurs when a molten slag contacts with coolant.In this research, the molten slag which includes more than 10 chemical compositions produced in actual steel mill industries is employed. Three types of coolant were

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Triggering steam explosions of single drops of a molten ferrosilicon alloy with a simple encapsulated mechanical impactor

Cited by 4 publications

References 10 publications

Extended Stefan problem for the solidification of binary alloys in a sphere

Extended Stefan problem for the solidification of binary alloys in a sphere

Meter-Scale Experiments on Magma-Water Interaction

Vapor explosion in steel mill industries: Chemical composition analysis on molten slag and coolant

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