Effect of packing density on flame propagation of nickel-coated aluminum particles

The combustion-wave propagation of nickel-coated aluminum particles is studied theoretically for packing densities in the range of 10–100% of the theoretical maximum density. Emphasis is placed on the effect of packing density on the burning properties. The energy conservation equation is solved num...

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Bibliographic Details
Published in:Combustion and flame 2014-11, Vol.161 (11), p.2916-2923
Main Authors: Sundaram, Dilip Srinivas, Yang, Vigor
Format: Article
Language:English
Subjects:
Burning rate
Diffusion
Effective thermal conductivity
Flame propagation
Nickel-coated aluminum particles
Packing density
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Summary:The combustion-wave propagation of nickel-coated aluminum particles is studied theoretically for packing densities in the range of 10–100% of the theoretical maximum density. Emphasis is placed on the effect of packing density on the burning properties. The energy conservation equation is solved numerically and the burning rate is determined by tracking the position of the flame front. Atomic diffusion coefficients and reaction rate of isolated nickel-coated aluminum particles are input parameters to the model. The burning behaviors and combustion wave structures are dictated by the heat transfer from the flame zone to the unburned region. Five different models for the effective thermal conductivity of the mixture are employed. The impact of radiation heat transfer is also assessed. As a specific example, the case with a particle size of 79μm is considered in detail. The burning rate remains nearly constant (
ISSN:0010-2180
1556-2921
DOI:10.1016/j.combustflame.2014.05.014