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Heat transfer by simultaneous conduction and radiation through ceramic fiber insulation is studied experimentally. The temperature profiles and the effective thermal conductivity are determined over a wide range of porosities of the insulation and of temperature provided at the hot boundary. The resulting data are analyzed in detail to gain an understanding of the mechanism of heat transfer through such medium. A semi-empirical formula is derived for quantitatively predicting the thermal performance of ceramic fiber insulation. The formula incorporates as parameters the porosity and temperatures of the hot and cold boundaries.
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Kamiuto et al. (1982) studied this question.
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