Journal ArticleDOI
Discrete Ordinate Methods for Radiative Heat Transfer in Isotropically and Anisotropically Scattering Media
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In this paper, the authors focus on the discrete ordinate method as a method for analyzing radiative heat transfer in isotropically and anisotropic scattering media and demonstrate that if ordinate sets are chosen to satisfy key moments of the radiative intensity, the resulting Nth order solution with the proposed quadrature is superior to the Nth-order solution using Gauss quadratures.Abstract:
The objective of this note is to focus on the discrete ordinate method as a method for analyzing radiative heat transfer in isotropically and anisotropically scattering media. In particular, one dimension is chosen only for simplicity, since exact solutions are available for benchmarking the discrete ordinate method. One-dimensional radiative heat transfer has been analyzed in many previous investigations and has been extensively reviewed by Viskanta. The development of the discrete ordinate method has been described in detail by Chandrasekhar and Lathrop. The discrete ordinate method using Gauss quadrature has been compared with approximate solutions. In the cases previously analyzed solutions were obtained using ordinate sets that were larger than necessary. This note demonstrates that if ordinate sets are chosen to satisfy key moments of the radiative intensity, the resulting Nth order solution with the proposed quadrature is superior to the Nth order solution using Gauss quadrature.read more
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Modeling of nitrogen oxides formation and destruction in combustion systems
Scott C. Hill,L. Douglas Smoot +1 more
TL;DR: A review of modeling of NOX reactions in combustion systems, with an emphasis on coal-fired systems, including current NO X control technologies, NO X reaction processes, and techniques to calculate chemical kinetics in turbulent flames are reviewed in this article.
Journal ArticleDOI
Three-dimensional radiative heat-transfer solutions by the discrete-ordinates method
TL;DR: In this article, the discrete-ordinates equations were formulated for an absorbing, anisotropic scattering, and re-emitting medium enclosed by gray walls and the conditions for computational stability were presented.
Three-dimensional radiative heat transfer solutions by the discrete-ordinates method
TL;DR: In this paper, the discrete-ordinates equations were formulated for an absorbing, anisotropic scattering, and re-emitting medium enclosed by gray walls and the conditions for computational stability were presented.
Journal ArticleDOI
Thermal conductivity modeling of periodic two-dimensional nanocomposites
Ronggui Yang,Gang Chen +1 more
TL;DR: In this article, the phonon Boltzmann equation model is used to study the thermal conductivity of nanocomposites with nanowires embedded in a host semiconductor material.
Journal ArticleDOI
Ray effect and false scattering in the discrete ordinates method
TL;DR: In this article, a discussion on the ray effect and false scattering occurring in discrete ordinates solution of the radiative transfer equation is presented, and four sample problems are used to explain these two effects.