Radiation from Fine Particle Clouds in High-Temperature Combustion Gas

Abstract

Radiation from fine particle cloud floating in high-temperature combustion gas was studied theoretically and the effects of temperature, its distribution, absorption thickness and the distribution of volumetric concentration were made clear. Radiations from particle clouds of carbon, ferric oxide, converter ash, diatomaceous earth and boiler ash were measured and the emissivity of particle cloud which has equal absorption thickness decreases in the following order of carbon, ferric oxide, converter ash, diatomaceous earth and boiler ash. The order of these emissivities agreed with that of the emissivities of particle-piled surfaces. Empirical formulae were obtained for the relation between the emissivity and absorption thickness.