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Abstract
The luminous emissivity is caused by soot formed from partial combustion and so depends knowingly on the relative rates of the processes of heating and oxygen admixture with the fuel. To predict luminous radiation we therefore need to know the relation between emissivity and soot concentration and the rise and fall of soot concentration along the flame. A reasonable approximation for the emissivity is:
Variations in observed optical properties (n, k) and in density ρ of the soot can account for the observed variation of nearly 6/1 in K3. Considerable further work is required before we can predict the soot formation and peak concentration and a special plug flow experimental furnace is recommended for this work. Work on plug flow furnaces has given a soot combustion formula of the type:
