Accession Number : AD0757140

Title :   Radiative Heat Transfer Through Composite Materials.

Descriptive Note : Technical rept.,

Corporate Author : ARMY ELECTRONICS COMMAND FORT MONMOUTH N J

Personal Author(s) : Greenberg,I. N. ; Klemens,P. G.

Report Date : DEC 1972

Pagination or Media Count : 15

Abstract : MATERIALS, *HEAT TRANSFER), POROUS MATERIALS, POWDERS, FOAM, FIBERS, THERMAL INSULATION, THERMAL CONDUCTIVITY, THERMAL RADIATIONRADIATIVE TRANSFERRadiative heat transfer in inhomogeneous materials is governed by the photon mean free path. For long-wave photons, the mean free path depends on the size and shape of the individual grains and, where applicable, of the voids. Long-wave photons have long mean free paths and play an important role in the heat transfer. In some cases they cause the radiative thermal conductivity at moderately high temperatures to be larger than one would expect by extrapolating from highest temperatures (above 2000K) according to a (T cubed) law. Some special cases are treated including polycrystalline solids, densely packed powders, foams and fibrous aggregates. (Author)

Descriptors :   (*COMPOSITE MATERIALS, *HEAT TRANSFER), POROUS MATERIALS, POWDERS, FOAM, FIBERS, THERMAL INSULATION, THERMAL CONDUCTIVITY, THERMAL RADIATION

Subject Categories : Laminates and Composite Materials
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE