Analysis of Radiative Heat Transfer in Ultra-Fine Powder Insulations Under Variation of Radiative Boundary Conditions

Hsin Sen Chu, Chung Jen Tseng

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Abstract

This paper reports the theoretical investigation of radiative heat transfer through the ultra-fine powder insulation (UFPI) Aerosil 380. The radiative transport process is modeled by the modified diffusion approximation solution and the two-flux solu tion of the equation of transfer. Accuracy of those two approximate methods are in vestigated by comparing the results with those of the Differential-Discrete-Ordinate (DDO) method. The radiative properties of UFPI for dependent effect consistent with these solutions have been determined based on the independent scattering and absorption coefficient which can be calculated by the Rayleigh scattering theory. The influences of the boundary emissivity on radiative heat transfer are also studied. The results show that the radiative thermal conductivity increases very sharply for the black boundary and has a very low value for the low-emissivity boundary. It is sug gested that UFPI systems should always be provided with low-emissivity boundaries around the aerosil powders.

Original languageEnglish
Pages (from-to)108-123
Number of pages16
JournalJournal of Thermal Envelope and Building Science
Volume12
Issue number2
DOIs
StatePublished - Oct 1988

Keywords

  • depen dent absorption
  • dependent scattering
  • Radiative heat transfer
  • ultra-fine powder insulations

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