Abstract
Monochromatic radiative properties of anisotropically scattering fly-ash polydispersions in combustion gas, such as the extinction coefficient, scattering coefficient, scattering albedo and Ledendre expansion coefficients for phase function, are calculated by the Mie scattering computer code with the monochromatic complex refractive index measured and arranged in the wavelength region of 0.7∼13μm and with measured on estimated bimodal particle distributions of fly ash. The extinction and absorption coefficients calculated for fly-ash polydispersions almost agree with the results obtained by small particle (x«1) approximations when the Sauter diameter D32 for polydispersions is much smaller than the corresponding wavelength (x32 10), but in the intermediate region (0.1<x32<10), exact numerical calculations of Mie scattering are required.
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