Abstract
Abstract : An analysis of the heterogeneous ignition of a solid, under convective heating by a hot gas, for large values of the activation energy reveals the existence of two ignition regimes. In a first regime, for large values of the frequency factor, a short reactive stage ending in thermal runaway follows a long inert stage. For small values of the frequency factor the chemical heat release can be neglected in a first stage but not in a much longer second stage when the surface temperature is close to the hot gas temperature; a critical value is found for the frequency factor below which no thermal runaway or well defined ignition time exists. Closed form expressions for the ignition time are given for both regimes.
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