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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.i1.60
pages 57-69

Critical Phenomena and Structural Effects in Combustion of Disordered Heterogeneous Mixtures

P. S. Grinchuk
A. V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences of Belarus, Minsk, Belarus
O. S. Rabinovich
A. V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences of Belarus, Minsk, Belarus


Numerical modeling methods were applied to investigate propagation of combustion waves in two-component heterogeneous media. The main attention was paid to identification of the role of a random distribution of the combustible mixture components in the propagation of combustion waves. Mixtures of the "fuel-inert filler" type and two-reagent mixtures were analyzed. It was shown that the random structure of such mixtures manifests itself most strongly in critical phenomena, characteristic of combustion processes, above all, within the concentration and thermal limits of combustion. Taking into account the random nature of the internal structure of mixtures allows a natural description of the experimentally observed percolating mode of the combustion wave propagation over an "infinite" cluster, formed by combustible elements of the mixture. A single criterion, combining physico-chemical and structural characteristics of the medium, has been found; a value of this criterion determines the transition from the frontal mode of the combustion wave propagation to the percolation mode.

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