Analytical Procedure for Evaluating the Emissivities of CO₂-H₂O Mixtures

抄録

In the radiative heat transfer of gas bodies it often becomes necessary to estimate the emissivities of mixtures, because the gas body would exist in the form of mixtures rather than of pure constituents in the practical engineering problems of interest. The current study presents an evaluation procedure of the emissivities of CO₂-H₂O mixtures on the basis of the tentative physical models about the interactions of radiation embodied in the spectroscopic analyses of carbon dioxide and water vapour and also includes the results of the evaluation. The wavelength regions of important overlapping of vibration-rotation bands are substantially restricted to CO₂-2.7μ band versus H₂O-2.7μ band and CO₂-15μ band versus H₂O-10μ∼pure rotations. In consequence the comparison of calculation results of the interaction term Δε with the Hottel's data indicates a pertinent consistency. It facilitates the estimation of Δε under an arbitrary physical condition (say, temperature, optical length, mixture ratio, etc.) and these results are applicable to the various important problems in the radiative heat transfer.