Accession Number : AD0664556

Title :   RADIATIVE TRANSPORT IN AN OPTICALLY THICK PLANAR MEDIUM,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s) : Emanuel,George

Report Date : DEC 1967

Pagination or Media Count : 16

Abstract : The problem of radiative transport of thermal energy between parallel, black, diffusely-emitting walls is solved by the method of matched asymptotic expansions when the intervening grey gas is optically thick. There is a thin thermal layer adjacent to each wall in which the Rosseland diffusion approximation is invalid. It is shown that this layer is closely connected to the restricted Milne problem of astrophysics, and that the layer disappears if the Milne-Eddington (or any equivalent) approximation is made. A simple, uniformly valid solution for temperature, temperature slip at the walls, and heat flux is given for the optically thick limit. (Author)

Descriptors :   (*THERMAL RADIATION, GASES), HEAT TRANSFER, APPROXIMATION(MATHEMATICS), ASTROPHYSICS, TEMPERATURE, WALLS, MATHEMATICAL ANALYSIS

Subject Categories : Astrophysics
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE