The spectral emissivity of metals and non-metals in the wavelength range 400-15000 nanometres and their total emissivity
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.
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