Ignition, extinction, and thermal hysteresis of a heterogeneous exothermic reaction |
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Authors: | I G Assovskii |
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Affiliation: | (1) Semenov Institute of Chemical Physics, Russian Academy of Sciences, 117977 Moscow |
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Abstract: | Critical conditions of ignition and extinction are studied theoretically for the case of a heterogeneous exothermic reaction
proceeding on the uniformly accessible surface of a channel or a pore. Particular emphasis is placed on the thermal-hysteresis
effect of the reaction (an ignition temperature in excess of the extinction temperature), which ensures stability of the reaction
against changes in the external conditions. A model for the process is proposed and substantiated. It permits one to analyze
the main regularities of the thermal reaction regime with allowance for the distribution of heat flows from the reaction zone
to the reaction medium and the channel wall. The dependence of the critical conditions of ignition and extinction on the rate
constants of heat release, the reaction order, and the thermal and geometric characteristics of the system is established.
A rule is proposed that permits evaluating the effect of heat losses on the critical phenomena and the thermal hysteresis
of a reaction on a cooled surface in the case where the critical conditions for the reaction on an adiabatic surface are known.
Translated fromFizika Goreniya i Vzryva, Vol. 34, No. 2, pp. 51–58, March–April, 1998. |
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