Determination of Planck Mean Absorption Coefficients for HF and HBr.
Determination of Planck Mean Absorption Coefficients for
HF and HBr.
Fuss, S. P.; Hamins, A.
Journal of Heat Transfer, Vol. 124, No. 1, 26-29,
absorption coefficient; combustion
The Planck mean absorption coefficient has been
calculated for HBr HCl, and HF over a temperature range
from 300 K-2300 K using data from the 1996 edition of
the HITRAN molecular database. Plots of ap versus
temperature showed monotonically decreasing behavior
over this temperature range, with peak values at 300 K
of 45.9 (atm-m)-1, 5.3 (atm-m)-1, and 1.95 (atm-m)-1 for
HF, HCl, and HBr, respectively. The magnitude of these
values suggests that HBr, HCl, and HF can significantly
impact calculations of radiative transfer in flames
containing these species. Two sets of additional
calculations were performed for CO to validate the
methodology used for calculation of ap for HBr, HF, and
HCl. In the first approach, which employed the narrow
band model RADCAL, the calculation procedure was similar
to that of the present calculations. The second approach
utilized tabulated values of the integrated intensity
for each CO band and an average value of the Planck
function within each band. Results from the three
methods showed general agreement. Polynomial
expressions are provided as fits to ap as a function of
temperature for HBr, HCl, HF, and CO.