ABSORPTION AND EMISSION CHARACTERISTICS OF AN IDEAL RADIATING GAS,
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1965
- Accession Number
- AD0614640
Entities
People
- Merwin Sibulkin
Organizations
- Brown University