Thermal radiation in coated-fibrous insulations

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1989

OSTI ID:6904817

Swathi, P S

This work examines reducing radiative heat transfer through fibrous insulations by applying coatings to the individual fibers. Both discrete and inhomogeneous coatings have been considered. The way coated fibers interact with electromagnetic waves has been established by solving Maxwell's equations. For discrete coatings an exact analytical solution was presented. For inhomogeneous coatings, two solutions, one numerical and one analytical were obtained. An algorithm for computing radiative properties from these solutions was developed. By using the radiative properties with a diffusion model for radiative heat transfer a considerable reduction in radiant heat flow was possible by coating silicon fibers with either silicon or silicon and silica. An integrating sphere experiment was conducted to validate the algorithm for computing the radiative properties of large and absorbing fibers. The solution for radiation scattering by fibers with discrete coatings was verified by comparing predicted angular scattering with measured values.

• Research Organization: Arizona Univ., Tucson, AZ (USA)
• OSTI ID: 6904817
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ANALYTICAL SOLUTION
CHALCOGENIDES
COATINGS
DIFFERENTIAL EQUATIONS
EQUATIONS
MATHEMATICAL MODELS
MAXWELL EQUATIONS
MINERALS
NUMERICAL SOLUTION
ORGANIC COMPOUNDS
ORGANIC SILICON COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PARTIAL DIFFERENTIAL EQUATIONS
PHYSICAL PROPERTIES
POLYMERS
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SILICONES
SILOXANES
THERMAL CONDUCTIVITY
THERMODYNAMIC PROPERTIES