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Heat Transfer Research
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ISSN Print: 1064-2285
ISSN Online: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.v38.i2.10
pages 95-106

Effect of the Microstructure of Heterogeneous Mixture on Regularities of Gas-Free Combustion

N. A. Kochetov
Institute of Structural Macrokinetics and Problems of Material Science, Russian Academy of Sciences, Chernogolovka, Moscow Region, Russian Federation
A. S. Rogachev
Institute of Structural Macrokinetics and Problems of Material Science, Russian Academy of Sciences, Chernogolovka, Moscow Region, Russian Federation
A. N. Emelianov
Institute of Structural Macrokinetics and Problems of Material Science, Russian Academy of Sciences, Chernogolovka, Moscow Region, Russian Federation
E. V. Illarionova
Institute of Structural Macrokinetics and Problems of Material Science, Russian Academy of Sciences, Chernogolovka, Moscow Region, Russian Federation
V. M. Shkiro
Institute of Structural Macrokinetics and Problems of Material Science, Russian Academy of Sciences, Chernogolovka, Moscow Region, Russian Federation

ABSTRACT

We performed a series of experiments on investigation of the microstructure of the initial charge for gas-free combustion, including investigation of compressibility, electroconductivity, thermal conductivity, rate of charge burning, as well as metallographic investigations. The determining role of the shape of particles and their capacity of formation of a continuous skeleton, as well as their impact on regularities of gas-free combustion have been identified. It has been shown that the velocity and mode of propagation of the gas-free combustion front are determined by the transfer of heat between metal particles in the initial reaction mixture, with the limiting role being played by contacts between particles. The method of atomic tunnel microscopy was used to study the micro relief of the surface of particles and determine the most probable width of micro gaps between the particles at the point of their contact. The presence of these gaps leads to a strong dependence of the mixture heat conduction on the gaseous atmosphere (vacuum, helium and air).


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