TED-AJ03-152 DEVELOPMENT OF ESTIMATION METHOD OF COMPLEX REFRACTIVE INDEX OF AEROSOL GENERATED BY SODIUM FIRE

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Estimation method is studied for complex index of refraction of aerosol generated by sodium fire. In the present study, non-gray radiative transfer analysis is carried out to precisely simulate the radiative transmission through uniformly distributed dispersed aerosol layer considering multiple scattering. The Monte Carlo method is used for the analysis. The results are compared with the empirical formula obtained by a radiative transmission experiment through aerosol layer generated by experimental sodium fire, and a method is proposed to estimate the complex index of refraction of the sodium oxide aerosol. Radiative heat transfer analysis is carried out in a system in which aerosol particles are uniformly dispersed in a transparent gas layer between two parallel infinite black walls. The particle diameters are assumed to have long-normal distribution. The distance between the walls is L=1m, and have temperatures of T_<w1>=900K and T_<w2>=0K respectively. The volume concentration of the aerosol is F_v=0.01. The aerosol particles act as absorbing/scattering media and the reemission of the absorbed radiation by the particles is assumed to be neglected. The absorbing and scattering characteristics of the aerosol layer are estimated by the Mie scattering theory. The aerosol particles are assumed to be dielectrics, which have transparent window between visible and near infrared region. In such system, the angular dependency of the incoming radiation intensity onto the low temperature wall is calculated by non-gray radiative energy transfer analysis of the radiation emitted from the high temperature wall and transmitted through the aerosol layer. From the analytical results of the profiles of transmitted radiative heat flux on the low temperature wall from each incident angle range, it is shown that, the polar-angular distribution of the incident heat flux on the low temperature wall depends on the value of refractive index n of the medium, even though the values of the n and the κ of the complex index of refraction of the medium form combinations to give the same normal transmittance. From these results, it is concluded that the value of the complex index of refraction of the medium can be estimated by measuring both the normal incidence and the scattered incidence.
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TED-AJ03-152 DEVELOPMENT OF ESTIMATION METHOD OF COMPLEX REFRACTIVE INDEX OF AEROSOL GENERATED BY SODIUM FIRE

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