Abstract
Measured emissivities of a large (i.e. 8000 lb/hr) residual fuel oil flame are compared with values deduced from an equation of the type e=1−[exp−(KmCL)](1−e1) where e is the total emissivity, e1 the non-luminous emissivity, Km an absorption term, C the mean concentration of carbon particles and L the flame thickness. C was determined directly by sampling carbon from the body of the flame and Km was obtained from extinction values, computed using the Mie series. At particle concentrations in excess of 1 mgm/l (at N.T.P.) the measured and calculated emissivity values are in good agreement. The peak emissivity of 0.95 occurs at about 6 ft from the burner tip and decreases down the flame to a value of 0.45.
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