Dynamics of phase-formation processes during self-propagating high-temperature synthesis in the thermal explosion regime |
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Authors: | V Yu Filimonov K B Koshelev |
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Affiliation: | (1) Polzunov Altai State Technical University, Barnaul, 656038, Russia |
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Abstract: | Specific features of formation of temperature and concentration fields during self-propagating high-temperature synthesis
in the thermal explosion regime in a cylindrical reactor are studied by methods of mathematical modeling. The calculations
are performed with allowance for melting of one (chemically active) component in the approximation with the high-melting component
being non-soluble in the melt of the low-melting component. It is shown that the conditions of complete conversion of the
original components in the volume of the reacting mixture depend on relations between the Biot criterion of the system, the
ambient temperature, and the thermal effect of the reaction. After the thermal explosion, which occurs when the melting front
reaches the geometric center of the reactor, a front of complete conversion is formed. This front moves from the cylinder
centerline to the periphery with a gradually decreasing velocity. The diagram of the critical values of the Biot criterion
at which the components burn down completely in the entire reaction volume is calculated.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 4, pp. 31–38, July–August, 2008. |
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Keywords: | thermal explosion high-temperature synthesis reaction diffusion conversion depth heat removal |
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