MACROSTATISTICAL MODEL DESCRIBING HEAT-TRANSFER BY RADIATION WITH DUEREGARD FOR THE VIBRATIONAL-BAND SPECTRUM - FORMULATION OF THE MODEL

A macrostatistical model of molecular spectrum of vibrational bands is derived, which is intended for calculation of the spectrum-averaged r adiation characteristics. According to this model, every vibrational b and is treated as an isolated absorption line in a spectral range. The line profile is described using the approximating dependences of Edwa rds. The mean transmission in a spectral range is found with the aid o f the statistical principle of multiplication of transmissions, in acc ordance with which the mean transmission of a spectral range is equal to the product of transmissions in individual lines that penetrated th is range. The macrostatistical model is very economical, because it en ables one to find the averaged radiation characteristics without resor ting to line-by-line integration or to some group models. The calculat ion is performed for a single spectral range. The Curtis-Godson method is used to calculate radiation transfer in nonuniform volumes.