Abstract
Heat fluxes in the vicinity of the reaction zone of carbon monoxide—air flames were measured with a conductivity-type heat-flow meter. It was found that, near the flamefront, the heat flux is much greater than that predicted from ordinary forced convection. Calculations were made by means of a correlation which includes terms for the diffusion and recombination of various labile species present in the flames. The concentrations of atoms and radicals necessary to produce the experimentally determined heat fluxes were estimated and found to be considerably higher than expected from equilibrium considerations. The catalytic effect of different surfaces was examined by coating the probe tip with either platinum or an oxide mixture. The effect of gaseous additives on the heat flux was also studied. Water vapor has a marked effect on the combustion mechanism of carbon monoxide, and drying of the combustible gases reduced the heat flux because of the decrease in concentration of hydrogen atoms. Traces of bromine added to the moist flame produced a similar effect.
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