Radiation of the Overheated Steam in a Hollow Sphere
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The quantification of radiative transfer is important in industrial applications such as the design of combustion chambers, furnaces and high temperature exchangers. Indeed, we will be more economic, if we know the time disposed for a heating or cooling process and the accurate quantities of energy received or deliberated. In combustor, the gases form a semi transparent medium. Neglect of radiation in calculating the heat transfer is justifiable only for transparent gases like the nitrogen (N2), oxygen (O2) and hydrogen (H2). The species taking part in radiation are mainly the steam and the carbon dioxide, and then their participation in radiative transfer must be accounted for. In lower part of the temperature of dissociation, these products of combustion emit and absorb the electromagnetic radiation in a multitude of very narrow spectral lines, which can be superimposed to form the bands known as vibro-rotational. The spectrum is located near the infrarouge, this strong dependence of the radiative properties at the composition and at the temperature of the medium increases the difficulty of the problem and especially in rather complex geometries. In this paper, the chosen semi-transparent medium is the overheated pure water steam that is considered like a non-gray gas, a fine study of its radiative properties has been achieved using a narrow-band model.
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