期刊
COMBUSTION AND FLAME
卷 229, 期 -, 页码 -出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.combustflame.2021.02.020
关键词
Al; CuO; Nanothermite; Propagation; Porosity; Numerical simulation
类别
资金
- Natural Sciences and Engineering Research Council (NSERC)
- SciNet
- Ontario Graduate Scholarship (OGS)
- University of Waterloo Graduate Student Fellowship
- Compute Canada
A continuum-scale model for the combustion of consolidated nanothermite pellets is introduced. Sensitivity analysis reveals the relative importance of modeling parameters for combustion regimes, and a non-dimensionalization approach is proposed to establish a linear scaling between the burn rate and Peclet number, achieving consistency between numerical results and experimental data. The study identifies a transition between conduction- and advection-dominated combustion based on the transient burn rate of the nanothermite pellet combustion.
A continuum-scale model for the combustion of consolidated nanothermite pellets is introduced. A simplified chemical kinetics model is used for the solid state nanothermite reaction while a two-phase porous media flow accounts for the mass and heat transfer within the consolidated pellet under an equilibrium thermodynamic assumption. The thermophysical and chemical kinetic properties of the Al/CuO nanothermite pellets are determined from the literature. A sensitivity analysis reveals the relative importance of these modelling parameters for both the advection and conduction-dominated combustion regimes. Based on the governing equations, we propose a thermodynamically consistent nondimensionalization of the global Peclet and Damk & ouml;hler numbers which are based on the characteristic Darcy velocity within the porous pellet. The non-dimensionalization results in a linear scaling between the normalized burn rate and Peclet number, which allows a collapse of the numerical results with published experimental data. We identify a transition between the conduction- and advection-dominated combustion based on the transient burn rate of the nanothermite pellet combustion. (c) 2021 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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