Document ID: 19930070466 A (93A54463) File Series: Open Literature

Report Number: None

Sales Agency & Price: Issuing Activity - Copyright

Authors: Siegel, R. (NASA Lewis Research Center), Spuckler, C. M. (NASA Lewis Research Center)

Journal Title: Journal of Thermophysics and Heat Transfer

Volume: 7 Issue: 4 Page: p. 624-630.

Published: Dec 01, 1993

Corporate Source: NASA Lewis Research Center (Cleveland, OH, United States)

Pages: 7

Contract Number: None

NASA Subject Category: FLUID MECHANICS AND HEAT TRANSFER

Abstract:

A simple set of equations is derived for predicting the temperature distribution and radiative energy flow in a semitransparent layer consisting of an arbitrary number of laminated sublayers that absorb, emit, and scatter radiation. Each sublayer can have a different refractive index and optical thickness. The plane composite region is heated on each exterior side by a different amount of incident radiation. The results are for the limiting case where heat conduction within the layers is very small relative to radiative transfer, and is neglected. The interfaces are assumed diffuse, and all interface reflections are included in the analysis. The thermal behavior is readily calculated from the analytical expressions that are obtained. By using many sublayers, expressions provide the temperature distribution and heat flow for a diffusing medium with a continually varying refractive index, including internal reflection effects caused by refractive index gradients. Temperature and heat flux results are given to show the effect of variations in refractive index and optical thickness through the multilayer laminate.

Major Subject Terms:

LAMINATES OPTICAL THICKNESS

RADIATIVE HEAT TRANSFER

REFRACTIVITY TEMPERATURE

DISTRIBUTION TRANSPARENCE

Minor Subject Terms:

DIMENSIONLESS NUMBERS INTERLAYERS

Language Note: English

Notes: Journal of Thermophysics and Heat Transfer vol. 7, no. 4 p. 624-630. Oct.-Dec. 1993

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