Abstract: | Necessary conditions are established for the validity of the Hottel formulas for the absorptivity relative to black radiation. The formulas are used in describing the absorption of a badly mixed medium and for nonblack incident radiation.Notation x
ray path in mat
- p, P
partial and total pressure
- Peff
effective broadening pressure
- T, T0
gas and wall temperatures, °K
- T*, Ti
selected temperature values
- Tc
weighted-mean temperature
- a0
absorptivity of the gas for black radiation
-
a
same for a flux with nonblack spectrum
-
emissivity
- m, u, n, ,
power exponents
-
i
0j
Planck function for the center of the band, cm · W/m2 · sr
- Ij
incident flux intensity at the center of the band j, cm · W/m2 · sr
- I
integrated incident flux intensity, W/m2 · sr
- Aj
integral absorption (equivalent width) of band f, cm–1
- j
mean absorption in the band
-
wave number, cm–1
-
0
position of the band center
-
j
width parameter
-
effj
effective width
-
j
total width of the band j, cm–1
- Dj
mean transmissivity in the band j
- S
integrated line intensity, cm–1/mat
- d, b
spacing between lines and their half-width, cm–1
- Sj
integrated intensity of the band j
- L
Landenburg and Reiche functions
-
spectral absorption coefficient, mat–1
- (T)
dimensionless function
- ci
dimensionless number
- R*, Rc
general notation for parameters averaged over the band and for Tc
- E
Elsasser function
Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 20, No. 5, pp. 802–808, May, 1971. |