Self-ignition of solids with diminishing reaction rates. Exact comparison between the results predicted using time-dependent and surface-oxygen absorption-dependent reaction rate

Abstract

In this paper, two comparisons between the two types of rate expressions (i.e. time and surface-oxygen absorption dependence) are provided to answer an important remaining fundamental question from an earlier numerical study by us in 1986. The time-dependent model appears to give a longer time-to-ignition than that predicted by another model type. It is concluded that the two types of chemical rate expressions give inherent differences between their predictions of self-ignition. It is very important to use the conceptually correct model, i.e. the surface-oxygen absorption-dependent rate model, in practical prediction of time-to-ignition.