Influence of the Metal Particle Size on the Ignition of Energetic Materials

Weiser, Volker; Kelzenberg, Stefan; Eisenreich, N.

doi:10.1002/1521-4087(200112)26:6<284::aid-prep284>3.0.co;2-t

Cited by 23 publications

(14 citation statements)

References 4 publications

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“…In case of fast reactions and steep profiles of temperature and species, the width of G U is small compared with the size of the included space. This means, in a numerical solution of Equation (15) the integration has to include only a small section of the total space neighboring the maximum of G U (G U ¼ 6 0). On the other hand this prevents conservation of mass and energy.…”

Section: Theory: the Hot-spot-model For Twocomponent Pyrotechnic Matementioning

confidence: 99%

“…However, the physico-chemical mechanisms of thermite type reactions are still far from being completely understood. Therefore, the modeling is also of particular interest [13] and there are some preliminary approaches for it [14], which describe particle ignition and propagation of reaction fronts in porous energetic materials [15][16][17]. In these studies, we only used the heat flow equation with a zero order reaction and obtained the result by application of the Green's function mirrored at the boundaries.…”

Section: Introductionmentioning

confidence: 99%

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Modeling Ignition and Thermal Wave Progression in Binary Granular Pyrotechnic Compositions

Knapp

Weiser

Kelzenberg

et al. 2014

Propellants Explo Pyrotec

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Oxidizer and fuel particles are the ingredients of classical pyrotechnics. Particle concentration, size, melting, evaporation, and decomposition of the particles, heat and mass transfer, reaction kinetics, and heat of reaction control the burning behavior of these mixtures. A hot‐spot approach models the reaction progress in three dimensions taking into consideration the particulate nature of pyrotechnic compositions. The governing reaction is assumed to be the oxidizer decomposition described by an Avrami‐Erofeev model. Predominantly, the distribution of the oxidizer and fuel particles and their size for various concentrations influence the burning rate beneath the reaction kinetic parameters. The computational results were compared with experimental progression rates and temperatures measured for an example system composed of various Al/CuO‐thermite mixtures with aluminum contents from 8 % to 70 %. The particle sizes were fixed to micrometer‐scale. The curve of progression rate calculations depending on the aluminium particle concentration and their distribution show the same shape as the experimental results.

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Section: Theory: the Hot-spot-model For Twocomponent Pyrotechnic Matementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling Ignition and Thermal Wave Progression in Binary Granular Pyrotechnic Compositions

Knapp

Weiser

Kelzenberg

et al. 2014

Propellants Explo Pyrotec

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“…2,7,9 In the experimental flash-heating process, the near-IR light is absorbed by metallic Al but not by dielectric Al 2 O 3 or NC. 10,11 The heated Al nanoparticles create multiple hot spots in the irradiated volume, which induces chemical reaction to spread out through the surrounding NC.…”

Section: Computational Modelmentioning

confidence: 99%

“…[5][6][7][8] Most of them are based on the hot spot or heat explosion theory. 5, 6 Weiser et al 7 used the mathematical expression for hot spot to describe the formation and subsequent initiation of hot spot in multi-particle explosives. Hunt et al 8 incorporated two separated Arrhenius-type into the heat energy equation to calculate the ignition temperature of Al/Ni nanoparticle composites.…”

Section: Introductionmentioning

confidence: 99%

Modeling Heat-Induced Chemical Reaction in Nanothermites Excited by Pulse Laser: A Hot Spot Model

Peng

Wang

Palpant

et al. 2010

Int. J. Mod. Phys. B

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A hot spot model, involving interaction of pulse laser with nanoparticles where heat diffusion and exothermic chemical reaction are considered and spread out of heat and chemical reaction, is developed to model the thermal reaction dynamic process of Al/NC (nitrocellulose) nanothermites excited by pulse laser for the purpose of verifying the experimental ablation criterion proposed recently and providing a microscopic insight into different physical pathways leading to ablation. In this model, the spatial position * Corresponding Author. 381 Int. J. Mod. Phys. B 2010.24:381-395. Downloaded from www.worldscientific.com by UNIVERSITY AT BUFFALO on 02/02/15. For personal use only. 382 Y. Peng et al.and conversion of matters taking place in chemical reactions are regarded as the functions of time, space, and temperature. An exact expression of power density absorbed by nanoparticles in matrix is incorporated to calculate the diameters of chemical reaction region. Calculation results justify experimental ablation criterion, and show that thermal decomposition mechanism predominates the nanosecond pulse-excited process before ablation but it is not suitable for the 100 ps regime which is qualitatively attributed to shock pressure. The effects of pulse duration and nanoparticle size on ablation threshold are examined. Int. J. Mod. Phys. B 2010.24:381-395. Downloaded from www.worldscientific.com by UNIVERSITY AT BUFFALO on 02/02/15. For personal use only.

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“…The Hot-Spot model was already used for preliminary studies [21], describing particle ignition and propagation of reaction fronts in porous energetic materials [1,22,23]. In Ref.…”

Section: Introductionmentioning

confidence: 99%

Modelling of Al/MnO₂ and Ti/MnO₂ Thermite Mixtures

Knapp

Eisenreich

Kelzenberg

et al. 2019

Propellants Explo Pyrotec

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In previous work a model was developed and introduced to describe the conversion of pyrotechnic mixtures taking in consideration its particulate character and solving the heat and the mass transfer coupled with reaction kinetics [1]. In this work the model was applied to thermite mixtures with manganese(IV) oxide as oxidizer and aluminium or titanium as fuel. The modelling results of burning rate dependent of fuel‐oxidizer ratio were compared with results from experiments. For the modelling process, the educts were characterized by determining particle size and distribution and chemical reaction kinetics parameters. Other parameters were taken from literature. The modelling results are in good agreement with the experimental ones. It seems that the made physical and chemical assumptions are the main factors to describe the shape of burning rate profile in thermite combustion and the negligence are not influential.

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Influence of the Metal Particle Size on the Ignition of Energetic Materials

Cited by 23 publications

References 4 publications

Modeling Ignition and Thermal Wave Progression in Binary Granular Pyrotechnic Compositions

Modeling Ignition and Thermal Wave Progression in Binary Granular Pyrotechnic Compositions

Modeling Heat-Induced Chemical Reaction in Nanothermites Excited by Pulse Laser: A Hot Spot Model

Modelling of Al/MnO₂ and Ti/MnO₂ Thermite Mixtures

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Influence of the Metal Particle Size on the Ignition of Energetic Materials

Cited by 23 publications

References 4 publications

Modeling Ignition and Thermal Wave Progression in Binary Granular Pyrotechnic Compositions

Modeling Ignition and Thermal Wave Progression in Binary Granular Pyrotechnic Compositions

Modeling Heat-Induced Chemical Reaction in Nanothermites Excited by Pulse Laser: A Hot Spot Model

Modelling of Al/MnO2 and Ti/MnO2 Thermite Mixtures

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Modelling of Al/MnO₂ and Ti/MnO₂ Thermite Mixtures