Determination of Radiative Fluxes in an Absorbing, Emitting, and Scattering Vapor Formed by Laser Irradiation

[+] Author and Article Information
P. Erpelding, A. Minardi, P. J. Bishop

Department of Mechanical Engineering and Aerospace Sciences, University of Central Florida, Orlando, FL 32816–0993

J. Heat Transfer 113(4), 939-945 (Nov 01, 1991) (7 pages) doi:10.1115/1.2911225 History: Received June 11, 1990; Revised April 23, 1991; Online May 23, 2008


A two-dimensional computer model is developed to determine the radiative heat flux distributions within the vapor formed above a metal target irradiated by a laser beam. An axisymmetric cylindrical enclosure containing a radiatively participating medium is considered. Scattering is assumed to be isotropic and allowances are made for variation of the radiative properties of the medium and boundaries. The P-1 and P-3 spherical harmonics approximations are used to solve the integro-differential radiative transfer equation. The resulting equations are then solved for the radial and axial heat fluxes using a finite-difference algorithm. The most significant factors affecting the results obtained from both the P-1 and P-3 approximations were the optical thickness of the medium and the type of laser profile incident upon the medium. Using different wall reflectivities and scattering albedos had a smaller effect. Changing the medium temperature had an insignificant effect as long as medium temperatures were below 20,000 K.

Copyright © 1991 by The American Society of Mechanical Engineers
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