Use of radiation diffusion model for determination of optical and thermal radiative properties of anisotropic silica fiber thermal insulation

Journal Article · Fri Mar 01 04:00:00 EST 1996 · International Journal of Thermophysics

DOI:https://doi.org/10.1007/BF01443408· OSTI ID:212880

Moiseev, S S; Petrov, V A; Stepanov, S V ^[1]

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1. Inst. of High Temperatures, Moscow (Russian Federation)

A radiation diffusion model is used to describe radiation transfer in highly scattering anisotropic semitransparent materials. The transmissivities of the sample disks of silica glass fiber thermal insulation of different thicknesses and orientations were measured. The samples were cut from the same insulation slab. The axis of material structure symmetry was parallel to the axis of samples in one case and perpendicular to it in the other case. The effective absorption coefficient and radiation diffusion coefficient were obtained for three wavelengths of a probing He-Ne laser, namely, 0.63, 1.15, and 3.39 {mu}m. The spectral hemispherical absorptivity and bihemisperical reflectivity as a function of the thickness of the plane layer are calculated and presented.

• Sponsoring Organization: USDOE
• OSTI ID: 212880
• Journal Information: International Journal of Thermophysics, Journal Name: International Journal of Thermophysics Journal Issue: 2 Vol. 17; ISSN IJTHDY; ISSN 0195-928X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
ANISOTROPY
CYLINDERS
LIGHT TRANSMISSION
OPTICAL PROPERTIES
SILICA
THERMAL INSULATION