Research on an inverse method of radiative properties of silica aerogel

The inverse method of radiative properties of silica aerogel based on the hemispherical reflectance and transmittance spectra was established. The radiative transfer problem of silica aerogel samples was calculated using discrete ordinates method, four-flux method and two-flux method respectively. The radiative properties of samples were obtained. Comparison of the discrete ordinates method, four-flux method and two-flux method indicated that the inverse results from the discrete ordinates method and the four-flux method were almost the same, the inverse results from the two-flux method were smaller than the values calculated by the discrete ordinates method and the four-flux method and the error is very large. The results also show that the interface reflection had little effect, can be neglected for high porosity silica aerogel. The research work of this paper has theoretical significance on radiative heat transfer of silica aerogel.