Optical constants of soot and their application to heat flux calculations

Optical Constants of Soot and Their Application to Heat Flux Calculations Data on the roorn temperature optical constants of soot are present.ed for the wavelength regions 0.4-0.8 micro m and 2. 7 -10.0 micro m Dispersion formlas are developed for interpolating the data between 0.8 and 2.5 micro m. The results are used to calculate the spectral absorption coefficient and the locall emissivties of soot suspensions. It is shown that the correct values of the optical constants are neeeded in thc use of light-scatterirrg techniques for the measurement of the soot concentration but that uncertainties introduced in flux calculations by use of approximate values of the optical constants are not greater than those inlroduced hy the present uncertainties in the valucs of the soot concentration