Emittance of a finite scattering medium with refractive index greater than unity

Journal Article · Tue Jan 01 04:00:00 EST 1980 · AIAA J.; (United States)

DOI:https://doi.org/10.2514/3.7686· OSTI ID:5197470

Crosbie, A L

Refractive index and scattering can significantly influence the transfer of radiation in a semitransparent medium such as water, glass, plastics, or ceramics. In a recent article (1979), the author presented exact numerical results for the emittance of a semiinfinite scattering medium with a refractive index greater than unity. The present investigation extends the analysis to a finite medium. The physical situation consists of a finite planar layer. The isothermal layer emits, absorbs, and isotropically scatters thermal radiation. It is characterized by single scattering albedo, optical thickness, refractive index, and temperature. A formula for the directional emittance is derived, the directional emittance being the emittance of the medium multiplied by the interface transmittance. The ratio of hemispherical to normal emittance is tabulated and discussed.

• Research Organization: Missouri-Rolla, University, Rolla, MO.
• OSTI ID: 5197470
• Journal Information: AIAA J.; (United States), Journal Name: AIAA J.; (United States) Vol. 18; ISSN AIAJA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
360404 -- Materials-- Polymers & Plastics-- Physical Properties-- (-1987)
360603 -- Materials-- Properties
CERAMICS
DIMENSIONS
ELECTROMAGNETIC RADIATION
EMISSION
ENERGY TRANSFER
GLASS
HEAT TRANSFER
HYDROGEN COMPOUNDS
LIGHT SCATTERING
MATERIALS
OPTICAL PROPERTIES
OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHYSICAL PROPERTIES
PLASTICS
RADIATIONS
REFRACTIVITY
SCATTERING
SYNTHETIC MATERIALS
THERMAL RADIATION
THICKNESS
WATER