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Heat Transfer Research
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Heat Transfer Research

DOI: 10.1615/HeatTransRes.v38.i2.80
pages 185-195

Nature of an Abnormal Dependence of the Rate of "Gas-Free" System Combustion on the Diameter

B. S. Seplyarskii
Institute of Structural Macrokinetics and Problems of Material Science, Russian Academy of Sciences, Chernogolovka, Moscow Region, Russian Federation

ABSTRACT

To explain experimental results that are abnormal from the viewpoint of the modern theory of combustion, a new convective-conductive model of gas-free system combustion was proposed. According to this model, convective heat transfer is caused by the flow of the layer of the melt of the easily melted reagent and the difference of pressures of impurity gases in front of and behind the melt layer; in such case, the velocity of melt penetration into the initial charge represents the velocity of combustion wave propagation. Assuming the limiting role of melt penetration into the initial charge, the basic parameters, affecting the velocity of combustion wave propagation, were identified. It was shown that, if a fine-dispersed component contains adsorbed gases released in the heating zone, then the decrease of the specimen diameter should lead to an increase of the combustion rate. In terms of the convective-conductive mechanism of combustion of the gas-free system, a whole number of experimental facts was explained that could not be explained by the existing theory of combustion based on the conductive mechanism of heat transfer.


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