Accession Number : AD0658209

Title :   ON GREY ABSORPTION COEFFICIENTS IN RADIATIVE TRANSFER.

Descriptive Note : Scientific interim rept.,

Corporate Author : MARTIN CO BALTIMORE MD RESEARCH INST FOR ADVANCED STUDIES

Personal Author(s) : Traugott,S. C.

Report Date : AUG 1967

Pagination or Media Count : 65

Abstract : The radiative heat flux and several frequency averaged absorption coefficients were calculated for a plane-parallel radiating gas slab, for a variety of absorption spectra. Both constant temperature and constant temperature gradient are considered. None of the assumptions concerning these coefficients of several recent non-grey models turn out to be verifiable, except at best under more restrictive conditions. With constant temperature, the heat flux is to a good approximation the same function of a single optical depth as in a grey gas. With variable temperature a radiative transfer equation with a common coefficient for both emission and absorption terms becomes meaningless, a separate coefficient should be used for the absorption term. (Author)

Descriptors :   (*HEAT TRANSFER, GASES), THERMAL RADIATION, TEMPERATURE, CONTINUUM MECHANICS, ABSORPTION, THERMODYNAMICS, THERMAL CONDUCTIVITY

Subject Categories : Physical Chemistry
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE