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Simulation of the Spectral Conducto-Radiative Exchanges within Semi-Transparent Heterogeneous Media

Extended Abstract For several decades now, numerous studies have been dedicated to porous refractory materials and their effectiveness in high temperature processes does not need to be proved anymore. Yet, an accurate identification of the thermal properties and the prediction of the thermal transfers in these media remains a challenge in some cases. A concrete example is the difficulty to predict the heat exchanges within semi-transparent materials. Indeed, in such media, the behavior towards thermal radiation varies with both the frequency of the radiation and the temperature. In other terms, the material can behave as opaque in a specific spectral range (conduction will then prevail) and can be totally transparent in another part of the spectrum where thermal radiation will be predominant. Therefore, a classic conducto-radiative simulation on a semi-transparent medium, where the radiative properties of the material are assumed constant with frequency and temperature, will fail to reproduce the real thermal behavior of the medium. To illustrate this point, the behavior under a heat flux of a fibrous material impregnated with silica aerogel was analysed. The experiment carried out made it possible to bring the front face of a 10 mm thick plate of this material to 3 temperature levels (300, 500, and 800°C) in 200 s, maintain these levels until 600 s and measure the evolution of the temperature of its rear face over time. On the three thermograms, a sudden increase in temperature was observed. This was