A two dimensional, two fluid model for sodium boiling in LMFBR fuel assemblies
Name
MIT-EL-80-011-06984544.pdf
Size
11.19 MB
Format
Adobe PDF
Checksum (MD5)
7d034d71767ff14b2a44dd3cb3fbc8b8
Author(s)
Granziera, Mario Roberto
Kazimi, Mujid S.
Date Issued
May 1980
Publisher
MIT Energy Laboratory
Series/Report no.
MIT-EL
80-011
Abstract
A two dimensional numerical model for the simulation of sodium boiling
transient was developed using the two fluid set of conservation equations.
A semiimplicit numerical differencing scheme capable of handling the problems
associated with the ill-posedness implied by the complex characteristic roots
of the two fluid problems was used, which took advantage of the dumping effect
of the exchange terms.
Of particular interest in the development of the model was the identi-
fication of the numerical problems caused by the strong disparity between the
axial and radial dimensions of fuel assemblies. A solution to this problem
was found which uses the particular geometry of fuel assemblies to accelerate
the convergence of the iterative technique used in the model.
The most important feature of the model was its ability to simulate severe
conditions of sodium boiling, in particular flow reversal, which was shown in
the tests performed with the model.
Three sodium boiling experiments were simulated with the model, with good
agreement between the experimental results and the model predictions.
Subjects
Two-phase flow |x Mathematical models
Liquid metal fast breeder reactors
Nuclear fuel elements |x Computer programs
Sodium cooled reactors
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