Transport Effects in Diffusion Theory
作者:
PomraningG. C.,
期刊:
Nuclear Science and Engineering
(Taylor Available online 1965)
卷期:
Volume 21,
issue 1
页码: 62-78
ISSN:0029-5639
年代: 1965
DOI:10.13182/NSE65-A21016
出版商: Taylor&Francis
数据来源: Taylor
摘要:
AbstractA diffusion theory for the asymptotic transport scalar flux is derived from the monoenergetic transport equation in slab geometry. By allowing the scalar flux to be discontinuous at a material property and/or an external-source discontinuity, the theory is able to predict exact asymptotic transport-theory behavior for two standard halfspace problems. A supplementary diffusion-like theory is developed to treat the non-asymptotic flux. The total (asymptotic plus non-asymptotic) formalism yields a continuous scalar flux distribution and gives exact transport -theory leakage from a halfspace with a spatially-constant source. Numerous numerical comparisons indicate that the theory proposed here is significantly more accurate than classical (P1) diffusion theory. The complexity of both the asymptotic and non-asymptotic formalisms is comparable with that of theP1method. Finally, the entire formalism is generalized to three dimensions in rectilinear- and curvilinear-coordinate systems.
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