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RESEARCH PAPERS

Molecular Gas Radiation in a Laminar or Turbulent Pipe Flow

[+] Author and Article Information
A. T. Wassel, D. K. Edwards

School of Engineering and Applied Science, University of California, Los Angeles, Calif.

J. Heat Transfer 98(1), 101-107 (Feb 01, 1976) (7 pages) doi:10.1115/1.3450450 History: Received August 05, 1975; Online August 11, 2010

Abstract

The temperature profile and the radiative and convective wall-heat fluxes for a hydro-dynamically established flow of a nongray gas in a cylinder are calculated numerically for laminar or turbulent flow. Turbulent eddy viscosity is represented by a two-region model having a near-wall-region and a far-from-wall region. Gas properties are represented by the exponential-winged band model. The controlling parameters are Nrm , the ratio of radiation conductance to molecular conductance, τR,i , the maximum spectral optical depth of the radius for the ith gas band, Wi , a measure of the importance of the ith band, and R t , the turbulent Reynolds number. Qualitatively the results for a gas with a single major band agree with a previous solution for a cylinder with internal heat generation. Radiative Nusselt number Nu R increases nearly linearly with Nrm . Radiative flux increases with τR rapidly at first and then only slowly. Increasing R t increases markedly the convective Nusselt number Nu C and appreciably Nu R . The gas layer effective transmissivity was found to increase with increasing R t and decrease with increasing τR . Quantitative comparisons with the constant-volume-heat-source case show discrepancies of up to 10 percent in Nu R and up to 25 percent in Nu C .

Copyright © 1976 by ASME
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