Radiative Heat Transfer Through Composite Materials.

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)

Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1972
Accession Number
AD0757140

Entities

People

  • I. N. Greenberg
  • P. G. Klemens

Organizations

  • United States Army Communications-Electronics Command

Tags

DTIC Thesaurus Topics

  • Composite Materials
  • Conductivity
  • Energy Transfer
  • Heat Transfer
  • High Temperature
  • Insulation
  • Materials
  • Mean Free Path
  • Porous Materials
  • Thermal Conductivity
  • Thermal Insulation

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.
  • Reinforced Composite Materials
  • Thermal Physics or Thermal Science.

Technology Areas

  • Microelectronics