Abstract
Abstract In this work, the radiative heat transfer of the ultra‐fine powder insulation Aerosil 380, with dependent scattering and absorption, is investigated theoretically. The radiative transport process is modeled by the two‐flux model and the diffusion approximate method to solve the government equations of transfer. The radiative properties of Aerosil 380 have been determined by the Rayleigh scattering theory because of the small values of particle size parameter. The results show that the dependent effect of scattering will reduce the scattering efficiency; however, the absorption efficiency will be increased due to the dependent absorption. The overall thermal radiation resistance is increased by the dependent effect. A comparison of radiative thermal conductivity has been calculated by the two models. The comparison reveals that the difference is small at a mean temperature of 300°K, but that the difference goes up to about 30 percent at a mean temperature of 400°K.
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