Abstract
Numerical calculations have been carried out to explain the effect of self absorption on the nature of the emitted intensity of the Na-5890 A line of the sodium doublet in water gas combustion plasma. The self absorption is purely an effect caused by the presence of cold wall boundary layers in an MHD duct. The effect of seed concentration, core temperature, wall temperature, boundary layer thickness and profile parameter on line shapes has been studied. It has been found that seed percentage is the major factor influencing the line shape parameters and core temperature is the major factor affecting the maximum radiated monochromatic line intensity.
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