Accession Number : AD0614640

Title :   ABSORPTION AND EMISSION CHARACTERISTICS OF AN IDEAL RADIATING GAS,

Corporate Author : BROWN UNIV PROVIDENCE R I

Personal Author(s) : Sibulkin,Merwin

Report Date : APR 1965

Pagination or Media Count : 45

Abstract : An approximate analysis of the radiative properties of gases is presented for use in problems of fluid mechanics involving radiative transfer of energy. Results are obtained for both line and continuum spectral absorption coefficients as functions of frequency and temperature. The corresponding emission coefficients are integrated to obtain Planck mean absorption coefficients. These results are presented in a nondimensional form which clarifies their meaning and gives insight into the numerical magnitudes of significant radiative properties. It is found, for example, that for monatomic gases in the temperature range considered, T < 30,000K (say), the emission from atomic lines always exceeds that from the continuum. After comparing the photon mean free paths with the particle mean free paths, it is found that the Planck photon mfp is much longer than the particle mfp but that the photon mfp corresponding to the peak line absorption coefficient is much shorter than the particle mfp. (Author)

Descriptors :   (*GASES, SPECTROSCOPY), (*HEAT TRANSFER, THERMAL RADIATION), LINE SPECTRA, ABSORPTION SPECTRA, BAND SPECTRA, CONTINUOUS SPECTRA, FREQUENCY, TEMPERATURE, NUMERICAL ANALYSIS, FUNCTIONS(MATHEMATICS), EQUATIONS, FLUID MECHANICS

Distribution Statement : APPROVED FOR PUBLIC RELEASE