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The spectral emissivity data of W, NbB(2), TaC, WC, ZrC, HfN, TaN, ZrN, Al(2)O(3), Cr(2)O(3), MgO and ThO(2), have been investigated. In the wavelength region of 400 - 3000 nanometers, the emissivity E(w) can be expressed as 1n_E(w)= a + bw , where a and b are independant of the wavelength w, but can vary with the temperature. In the wavelength range 3000 - 15000 nanometers, there is a rapid rise and decrease of the spectral emissivity of Al(2)O(3), Cr(2)O(3), MgO and ThO(2). The variations of the spectral emissivity can be represented by the equation ln_[E(w)/(1-E(w)] = c + dw. The total emissivity deduced from these equations compares well with the experimental value. Numerically, the total emissivity is equal to the spectral emissivity at a wavelength given by ln w = 1.5497 - 4.049 1.0 E-4 T.

Additional information

Authors: BABELOT J F, JRC Karlsruhe Estab. (DE);HOCH M, University of Cincinnati (US)
Bibliographic Reference: Paper presented: 11th European Conference on Thermophysical Properties, Umea (SE), June 13-16, 1988
Availability: Available from (1) as Paper EN 34398 ORA
Record Number: 198910120 / Last updated on: 1994-12-01
Original language: en
Available languages: en