Scaling Rules for Total Absorptivity and Emissivity of Gases

[+] Author and Article Information
D. K. Edwards

University of California, Irvine, Calif. 92717

R. Matavosian

Bechtel Power Corporation, Houston, Texas 77056

J. Heat Transfer 106(4), 684-689 (Nov 01, 1984) (6 pages) doi:10.1115/1.3246739 History: Received September 29, 1983; Online October 20, 2009


Hottel’s Rule and Penner’s Rule for estimating the total absorptivity of a homogeneous gas from a total emissivity chart or expression are generalized. The generalized rule is developed from an examination of the functional relationships between total and spectral molecular gas radiation properties. It gives a rational prescription for finding the absorptivity or emissivity at arbitrary pressure from the one-atmosphere total emissivity. Calculations of total properties from band absorption data correlations are used to find the needed map of pressure scaling exponent versus path-length-pressure product and gas temperature. Also addressed is the question of allowing for reflecting walls in the calculation of radiation heat transfer between a homogeneous gas and its enclosing walls. Both exact and high-accuracy-approximate calculations are shown to be possible using only total properties.

Copyright © 1984 by ASME
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