Spectral Emittance of Participate Ash-Like Deposits: Theoretical Predictions Compared to Experimental Measurement

摘要

This note presents results of a theoretical and experimental investigation on the emittance of paniculate deposits. A simple model based on independent and multiple scattering and using discrete ordinate method has been developed to predict the spectral hemispherical and normal emittance of paniculate deposits. The model predictions are compared with measurements carried out under this study-controlled spectral emission measurements between wavelengths of 2 and 12 μm on deposits of ground synthetic ash particles having known composition and panicle size. The trends from the predictions matched well with the measured values, except for some differences in the wavelength region below 4 μm, and between 8 μm and 12 μm wavelength. Possible reasons for these differences are discussed.