Cool Air-Gas Mixtures with Combustible Gas Admixtures Steady Flameless Combustion Delay Time on Platinum Particle (Wire)

Abstract

The proposed work shows analytical way to find a build-up time (induction period) for a mode of steady flameless catalytic combustion on metallic wire for cool air-gas mixtures with combustible gaseous admixtures using as an example flameless combustion of air-gas mixtures with hydrogen admixture of a platinum wire. Steady flameless combustion is observable after an induction period due to increase of initial catalyst temperature exceeding critical point of ignition which depends on particle diameter and combustible gaseous admixture content. Total time of build-up time is split into two stages, being the time of catalytic reaction proceeding in transient and diffusion stages, respectively. Effects of combustible gas ratio, catalyst wire diameter and excess of initial temperature compared with point of ignition upon particular stages duration and induction period are illustrated. Keywords: metallic oxidation catalysts, platinum wire, hydrogen, induction period, ignition, self-ignition, fading, surface (flameless) combustion.