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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
G-type shells in shell-and-tube heat exchangers: Gaddis, E S, Galerkin method, for heat conduction finite-element calculations, Galileo number, Gas-liquid flows: Gas-liquid-solid interfaces, fouling at, Gas-solid interfaces, fouling at, Gas tungsten arc welding, Gaseous fuels, properties of, Gases:
as constituent of multiphase flows, density of pure, diffusion coefficients in, emissivity of, emissivity of combustion product mixtures of
Emissivity Data for Gases
isothermal, radiative heat transfer in, nonisothermal, radiative heat transfer in, radiation properties, superheated, thermodynamic properties of, tables, transport properties tables: for low pressure, viscosity of,
Gaskets: Gauss-Seidel method, for solution of implicit equations, Geometric optics models for radiative heat transfer from surfaces, geothermal brines, fouling of heat exchangers by, Germany, Federal Republic of, mechanical design of heat exchangers in: Gersten, K, Girth flanges, in shell-and-tube heat exchangers, Glass production, furnaces and kilns for, Glycerol (glycerine): Gn (heat generation number), Gnielinski, V Gnielinski correlation, for heat transfer in tube banks, Gomez-Thodas method, for vapour pressure, Goodness factor, as a basis for comparison of plate fin heat exchanger surfaces, Goody narrow band model for gas radiation properties, Gorenflo correlation, for nucleate boiling, Gowenlock, R, Graetz number: Granular products, moving, heat transfer to, Graphite, density of, Grashof number Gravitational acceleration, effect in pool boiling, Gravity conveyor: Gregorig effect in enhancement of condensation, Grid baffles: Grid selection, for finite difference method, Griffin, J M, Groeneveld correlation for postdryout heat transfer, Groeneveld and Delorme correlation for postdryout heat transfer, Gross plastic deformation Group contribution parameters tables, Guerrieri and Talty correlations for forced convective heat transfer in two-phase flow, Gungor and Winterton correlation, for forced convective boiling, Gylys, J,

Index

HEDH
A B C D E F G
G-type shells in shell-and-tube heat exchangers: Gaddis, E S, Galerkin method, for heat conduction finite-element calculations, Galileo number, Gas-liquid flows: Gas-liquid-solid interfaces, fouling at, Gas-solid interfaces, fouling at, Gas tungsten arc welding, Gaseous fuels, properties of, Gases:
as constituent of multiphase flows, density of pure, diffusion coefficients in, emissivity of, emissivity of combustion product mixtures of
Emissivity Data for Gases
isothermal, radiative heat transfer in, nonisothermal, radiative heat transfer in, radiation properties, superheated, thermodynamic properties of, tables, transport properties tables: for low pressure, viscosity of,
Gaskets: Gauss-Seidel method, for solution of implicit equations, Geometric optics models for radiative heat transfer from surfaces, geothermal brines, fouling of heat exchangers by, Germany, Federal Republic of, mechanical design of heat exchangers in: Gersten, K, Girth flanges, in shell-and-tube heat exchangers, Glass production, furnaces and kilns for, Glycerol (glycerine): Gn (heat generation number), Gnielinski, V Gnielinski correlation, for heat transfer in tube banks, Gomez-Thodas method, for vapour pressure, Goodness factor, as a basis for comparison of plate fin heat exchanger surfaces, Goody narrow band model for gas radiation properties, Gorenflo correlation, for nucleate boiling, Gowenlock, R, Graetz number: Granular products, moving, heat transfer to, Graphite, density of, Grashof number Gravitational acceleration, effect in pool boiling, Gravity conveyor: Gregorig effect in enhancement of condensation, Grid baffles: Grid selection, for finite difference method, Griffin, J M, Groeneveld correlation for postdryout heat transfer, Groeneveld and Delorme correlation for postdryout heat transfer, Gross plastic deformation Group contribution parameters tables, Guerrieri and Talty correlations for forced convective heat transfer in two-phase flow, Gungor and Winterton correlation, for forced convective boiling, Gylys, J,
H I J K L M N O P Q R S T U V W X Y Z
G Gases: emissivity of combustion product mixtures of
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Emissivity Data for Gases

DOI 10.1615/hedhme.a.000528

5.5 PHYSICAL PROPERTY DATA TABLES
5.5.5 Emissivity data for gases

D.K. Edwards and R. Matavosian

Table 1a, Table 1b, and Table 1c present the total emissivity of water vapor, carbon dioxide gas, and a mixture as a function of PaL and Tg. The quantity is the partial pressure of the absorbing gas, H2O or CO2; L is the beam length of concern; and Tg is the gas temperature. The tables for the individual gases are presented for an equivalent broadening pressure ratio Pe of 1. The ratio is defined in the footnote to Table 1a and accounts for the fact that collisions between absorbing molecules and foreign gas molecules are less effective in broadening the absorption lines than absorber-absorber collisions. In the case of Table 1c the total pressure of the mixture is 1 atm. and the absorber partial pressure Pa is that of the H2O component in the mixture.

The tables are based on the information contained in Table 5-1 of Section 208 in the manner illustrated there in the sample calculations.

The emissivity grows with PaL because at constant Ts the number of absorbing molecules increases as PaL increases. At low values of PaL the emission is weak, and each additional molecule adds equally to the absorption; hence εg is linear in PaL. At higher values the addition of greater opacity at the centers of the lines has little additional effect there, but more is emitted between the lines. The εg integrated over the lines grows as \(\sqrt{P_a L}\). At still higher values of PaL, the addition of greater opacity even between the lines near the center of the absorption-emission band has little additional effect there, and εg grows primarily in the tails of the bands, in total even more slowly. Logarithmic interpolation in Table 1a, Table 1b, and Table 1c is recommended as follows:

\(\epsilon_{g}(P_{a}L) = \epsilon_{g}(P_{a}L_{2})\left(\frac{P_{a}L}{P_{a}L_{2}}\right)^{n}\notag\)

\(n = \frac{\log[\epsilon_{g}(P_{a}L_{2})/\epsilon_{g}(P_{a}L_{1})]}{\log(P_{a}L_{2}/P_{a}L_{1})}\notag\)

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