RESEARCH PAPERS: Radiative Transfer

K-Distribution Analysis of Gas Radiation With Nongray, Emitting, Absorbing, and Anisotropic Scattering Particles

[+] Author and Article Information
K. C. Tang, M. Q. Brewster

Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801

J. Heat Transfer 116(4), 980-985 (Nov 01, 1994) (6 pages) doi:10.1115/1.2911474 History: Received May 01, 1993; Revised January 01, 1994; Online May 23, 2008


The K-distribution technique is presented for predicting nongray gas radiation in the presence of particle scattering. This technique transforms the otherwise formidable spectral integration problem from the frequency domain to the K or gas absorption coefficient domain. This transformation is made possible by the negligible variation of blackbody intensity and particle radiative properties with frequency within a gas band. Application of the K-distribution technique to an isothermal emission problem is made. Results are compared with those from the Monte-Carlo method, These results show that, with the K-distribution technique, the detailed absorption line structure within a gas band as well as the scattering effect due to particles can be simulated with great numerical accuracy and computational efficiency. Essentially, line-by-line accuracy is achieved without line-by-line spectral integration.

Copyright © 1994 by The American Society of Mechanical Engineers
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