On the Mechanism of Combustion Propagation in Porous Nanothermites

The fast combustion process of nanosized porous Al + CuO mixtures placed in glass tubes is studied using a high-speed video recording. Mathematical processing of the high-velocity frame sequence obtained using neutral filters of different thicknesses made it possible to determine the nanothermite (N...

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Veröffentlicht in:Russian journal of physical chemistry. B 2023-08, Vol.17 (4), p.936-946
Hauptverfasser: Kirilenko, V. G., Dolgoborodov, A. Yu, Brazhnikov, M. A., Kuskov, M. L.
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Sprache:eng
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Zusammenfassung:The fast combustion process of nanosized porous Al + CuO mixtures placed in glass tubes is studied using a high-speed video recording. Mathematical processing of the high-velocity frame sequence obtained using neutral filters of different thicknesses made it possible to determine the nanothermite (NT) burning rate in different parts of the tube and experimentally estimate the sizes of the ignition and combustion zones of NT. To explain the mechanism of combustion propagation, a simple model based on Darcy’s law is proposed for the filtration of hot products through the macropores. Based on the results of the model experiments on the combustion of NT in glass-tubes filled by portions of the mixture separated by inert barriers (glass microspheres, air gaps), it was possible to develop a simple procedure to estimate the permeability of a nanosized mixture and pressure in the combustion zone.
ISSN:1990-7931
1990-7923
DOI:10.1134/S1990793123040243