Aluminum dust ignition behind reflected shock wave: two-dimensional simulations

Benkiewicz, K.; Hayashi, A. Koichi

doi:10.1016/s0169-5983(02)00036-9

Cited by 25 publications

(18 citation statements)

References 24 publications

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“…While some studies suggested that it was a fixed value around the melting temperature of the aluminum particles [21,24], many others suggest that the ignition temperature is not a material property but depends upon the environmental variables, such as the heating rates [25][26][27], particle size [28], specific experimental conditions or methods employed [29,30] and instruments used [29,31,32]. It is still debatable if the ignition of aluminum nanoparticles occurred before or after the melting temperature of aluminum.…”

Section: Influence Of the Heating Ratementioning

confidence: 99%

Exothermic characteristics of aluminum based nanomaterials

et al. 2015

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Nano-structured energetic materials have been recently proposed as novel energy storage media where the exothermic reaction is the key to control the heat release process. The properties of nanoalloys, which can be engineered not only by the particle size, but also by varying their elemental compositions, are very appealing. This work conducts a comparative experimental study of the exothermic characteristics of two nanomaterials in the air, aluminum nanoparticles (nAl) and aluminum-copper nanoalloys (nano-AlCu) based on TGA/DSC studies. The results show that the general exothermic characteristics of nano-AlCu are very similar to that of nAl but the nano alloy is more reactive. The nano-AlCu oxides and ignites at lower temperature, and influenced by the heating rate. An early ignition is found for both nanomaterials, and melting of the nano-alloy is believed to be responsible for its early ignition.

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Section: Influence Of the Heating Ratementioning

confidence: 99%

Exothermic characteristics of aluminum based nanomaterials

et al. 2015

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“…Many compressible granular multiphase flows are modelled using the 'dust-gas approximation', which neglects particle-particle interactions and collision processes, and so it effectively assumes that the particles are dilute in the background gas (Collins et al 1994;Benkiewicz & Hayashi 2002;Saito, Marumoto & Takayama 2003;Pelanti & LeVeque 2006;Fedorov, Kharlamova & Khmel' 2007;Kuhl, Bell & Beckner 2010). These models have been used to study detonations of particle suspensions, explosion suppression from aerosolized particles, lifting of dilute dust layers, and the dispersion and combustion of aluminium particles in the turbulent flow field generated by an explosion.…”

Section: Introductionmentioning

confidence: 99%

A multiphase model for compressible granular–gaseous flows: formulation and initial tests

2016

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A model for predicting the behaviour of a compressible flow laden with shocks interacting with granular material has been developed and tested. The model consists of two sets of coupled Euler equations, one for the gas phase and the other for the granular phase. Drag, convective, heat transfer and non-conservative terms couple the two sets of governing equations. Intergranular stress acting on the grains is modelled using granular kinetic theory in dilute regimes where particle collisions are dominant and frictional-collisional pressure in dense regions where layers of granular material slide over one another. The two-phase granular-gaseous model, as a result, is valid from dilute to densely packed granular regimes. The solution of these nonlinearly coupled Euler equations is challenging due to the presence of the non-conservative nozzling and work terms. A numerical technique, based on Godunov's method, was designed for solving these equations. This method takes advantage of particle incompressibility to simplify the nozzling terms. It also uses the observation that a Riemann problem is valid in the region where gas can flow between particles and can be used to provide a physically accurate approximation of the non-conservative terms. The model and solution method are verified by comparisons to test problems involving granular shocks and two-phase shock-tube problems, and they are validated against experimental measurements of shock and dense particle-curtain interactions and transmitted oblique granular shocks.

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“…Control and characterization of shock induced ignition processes include ignition of condensed phase explosives [1,2], abnormal ignition of propellants [3], burning of metal additives in rocket motors [4], explosion safety issues in dusty environments (e.g. flour mills, grain elevators and coal mines) [5,6], and the fundamental issues of deflagration-to-detonation-transition (DDT) for single-phase [7] and two-phase mixtures [8].…”

Section: Introductionmentioning

confidence: 99%

“…Numerous studies have employed dusty gas approximations to examine the interaction of shocks. Examples include shocks interacting with inert [9], coal [10], aluminum [4], and hydrocarbon [11] particles and droplets. A recent review of the literature in this area applied to DDT is provided by Zhang [12].…”

Section: Introductionmentioning

confidence: 99%

Modeling of particle compressibility and ignition from shock focusing

Ruggirello

DesJardin

Baer

et al. 2010

Combustion Theory and Modelling

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Two-phase shock-driven reacting flow simulations are conducted to determine the postdetonation shock-focusing ignition and burning of aluminum particle mixtures. A model for aluminum particles that accounts for material compressibility from shock heating and expansion is presented. The Lagrangian description of the particles is incorporated into an Eulerian description of the gas phase resulting in a fully compressible, twoway coupled simulation. Simulations are conducted of an isolated explosive located near a corner to promote ignition of the particles from shock focusing. Parametric studies are conducted to determine the effects of equivalence ratio, particle size, and charge placement, on the post-detonation pressure and impulse. Results highlight the importance of the timing and position of the shock focusing event relative to the local mixture equivalence ratio that results in an optimal equivalence ratio which maximizes impulse for the geometry considered.

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Aluminum dust ignition behind reflected shock wave: two-dimensional simulations

Cited by 25 publications

References 24 publications

Exothermic characteristics of aluminum based nanomaterials

Exothermic characteristics of aluminum based nanomaterials

A multiphase model for compressible granular–gaseous flows: formulation and initial tests

Modeling of particle compressibility and ignition from shock focusing

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