Open AccessOptimal Band Selection for the Calculation of Planck Mean Absorption Coefficients
Author(s) -
M. Gnybida,
Ch. Rümpler,
Vimala Narayanan
Publication year - 2017
Publication title -
plasma physics and technology
Language(s) - English
Resource type - Journals
eISSN - 2336-2634
pISSN - 2336-2626
DOI - 10.14311/ppt.2017.1.70
Subject(s) - thermal radiation , radiative transfer , computational physics , radiation , absorption (acoustics) , attenuation coefficient , switchgear , atomic physics , chemistry , materials science , physics , optics , thermodynamics , quantum mechanics
Radiative heat transfer is a major heat loss mechanism in thermal plasmas generated during arc flashes/faults in switchgear applications or during high current interruption in low voltage circuit breakers. A common way to calculate the radiation balance is by means of approximate non-gray radiation models like P1 or discrete ordinates (DOM), where the frequency dependent absorption and emission are described in a number of frequency intervals (bands) using a constant absorption coefficient in each band. Current work is focused on finding the optimal number of bands as well as band interval boundaries that provide a reasonable level of accuracy in comparison to a full spectral solution. An optimization procedure has been applied to different SF 6 and copper vapor gas mixtures for an assumed temperature profile. Radiation model results using optimized band averaged absorption coefficients as well as spectral values are provided and discussed for the exemplary temperature profile.