Appropriate Mean Absorption Coefficients for Infrared Radiation of Gases

1967 ◽  
Vol 89 (4) ◽  
pp. 321-327 ◽  
Author(s):  
M. M. Abu-Romia ◽  
C. L. Tien
Keyword(s):  
Carbon Dioxide ◽  
Heat Flux ◽  
Carbon Monoxide ◽  
Water Vapor ◽  
Thermodynamic Properties ◽  
Infrared Radiation ◽  
Radiative Heat ◽  
Radiative Heat Flux ◽  
Absorption Coefficients ◽  
Planar Medium

In this paper, a study is made on the calculation of appropriate mean absorption coefficients for the infrared radiation of gases. The Planck and Rosseland mean absorption coefficients for the optically thin and optically thick gases are expressed as functions of the spectroscopic and thermodynamic properties of the gas. Values of the Planck and Rosseland mean absorption coefficients are presented for carbon monoxide, carbon dioxide, and water vapor in the temperature range from 1000 to 5000 deg Rankine. To illustrate the application of these results, the radiative heat flux is calculated for the simple case of a planar medium.

Infrared Mean Absorption Coefficients of Luminous Flames and Smoke

1978 ◽  
Vol 100 (2) ◽  
pp. 235-239 ◽  
Author(s):  
G. L. Hubbard ◽  
C. L. Tien
Keyword(s):  
Carbon Dioxide ◽  
Water Vapor ◽  
Absorption Coefficient ◽  
Infrared Radiation ◽  
Dominant Species ◽  
Close Agreement ◽  
Simple Procedure ◽  
Absorption Coefficients ◽  
Carbon Soot ◽  
The Mean

A simple procedure has been developed for the calculation of the Planck mean emission and absorption coefficients and the Rosseland mean absorption coefficient for infrared radiation of the soot-gas mixtures commonly occurring in luminous flames and smoke. Specific results are presented for mixtures involving carbon dioxide, water vapor and carbon soot, the dominant species in most combustion systems. The close agreement between the various averages clearly demonstrates the usefulness of the mean absorption coefficient concept for applications.

Nonequilibrium radiative heat flux modeling for the Huygens entry probe

2006 ◽  
Vol 111 (E7) ◽  
Author(s):  
T. E. Magin ◽  
L. Caillault ◽  
A. Bourdon ◽  
C. O. Laux
Keyword(s):  
Heat Flux ◽  
Radiative Heat ◽  
Radiative Heat Flux ◽  
Entry Probe

Handling of Collimated Irradiation on a Plane-Parallel Participating Medium

2000 ◽  
Author(s):  
Christian Proulx ◽  
Daniel R. Rousse ◽  
Rodolphe Vaillon ◽  
Jean-François Sacadura
Keyword(s):  
Heat Flux ◽  
Monte Carlo ◽  
Monte Carlo Method ◽  
Radiative Heat ◽  
Radiative Heat Flux ◽  
Scattering Media ◽  
One Dimensional ◽  
Plane Parallel ◽  
Collimated Beam ◽  
Good Agreement

Abstract This article presents selected results of a study comparing two procedures for the treatment of collimated irradiation impinging on one boundary of a participating one-dimensional plane-parallel medium. These procedures are implemented in a CVFEM used to calculate the radiative heat flux and source. Both isotropically and anisotropically scattering media are considered. The results presented show that both procedures provide results in good agreement with those obtained using a Monte Carlo method, when the collimated beam impinges normally.

Partitioning measurements of convective and radiative heat flux

2015 ◽  
Vol 84 ◽  
pp. 827-838 ◽  
Author(s):  
Thomas Vega ◽  
Rachel A. Wasson ◽  
Brian Y. Lattimer ◽  
Thomas E. Diller
Keyword(s):  
Heat Flux ◽  
Radiative Heat ◽  
Radiative Heat Flux

Spectral Radiative Heat Transfer Analysis of the Planar SOFC

2004 ◽  
Author(s):  
David L. Damm ◽  
Andrei G. Fedorov
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Radiative Heat Transfer ◽  
Radiative Heat ◽  
Solid Oxide ◽  
Radiative Properties ◽  
Radiative Heat Flux ◽  
Oxide Fuel

Thermo-mechanical failure of components in planar-type solid oxide fuel cells (SOFCs) depends strongly on the local temperature gradients at the interfaces of different materials. Therefore, it is of paramount importance to accurately predict the temperature fields within the stack, especially near the interfaces. Because of elevated operating temperatures (of the order of 1000 K or even higher), radiation heat transfer could become a dominant mode of heat transfer in the SOFCs. In this study, we extend our recent work on radiative effects in solid oxide fuel cells (Journal of Power Sources, Vol. 124, No. 2, pp. 453–458) by accounting for the spectral dependence of the radiative properties of the electrolyte material. The measurements of spectral radiative properties of the polycrystalline yttria-stabilized zirconia (YSZ) electrolyte we performed indicate that an optically thin approximation can be used for treatment of radiative heat transfer. To this end, the Schuster-Schwartzchild two-flux approximation is used to solve the radiative transfer equation (RTE) for the spectral radiative heat flux, which is then integrated over the entire spectrum using an N-band approximation to obtain the total heat flux due to thermal radiation. The divergence of the total radiative heat flux is then incorporated as a heat sink into a 3-D thermo-fluid model of a SOFC through the user-defined function utility in the commercial FLUENT CFD software. The results of sample calculations are reported and compared against the baseline cases when no radiation effects are included and when the spectrally gray approximation is used for treatment of radiative heat transfer.

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