Bypass Flow Resistance in Prismatic Gas-Cooled Nuclear Reactors [electronic resource].

Published:: Washington, D.C. : United States. Office of the Assistant Secretary for Nuclear Energy, 2016.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description:: Article numbers 011,003 : digital, PDF file
Additional Creators:: Idaho National Laboratory, United States. Office of the Assistant Secretary for Nuclear Energy, and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

Available computational fluid dynamics (CFD) predictions of pressure distributions in the vertical bypass flow between blocks in a prismatic gas-cooled reactor (GCR) have been analyzed to deduce apparent friction factors and loss coefficients for systems and network codes. We performed calculations for vertical gap spacings "s" of 2, 6 and 10 mm, horizontal gaps between the blocks of two mm and two flow rates, giving a range of gap Reynolds numbers ReDh of about 40 to 5300. Laminar predictions of the fully-developed friction factor ffd were about three to ten per cent lower than the classical infinitely-wide channel In the entry region, the local apparent friction factor was slightly higher than the classic idealized case but the hydraulic entry length Lhy was approximately the same. The per cent reduction in flow resistance was greater than the per cent increase in flow area at the vertical corners of the blocks. The standard k-ϵ model was employed for flows expected to be turbulent. Its predictions of ffd and flow resistance were significantly higher than direct numerical simulations for the classic case; the value of Lhy was about thirty gap spacings. Initial quantitative information for entry coefficients and loss coefficients for the expansion-contraction junctions between blocks is also presented. Our study demonstrates how CFD predictions can be employed to provide integral quantities needed in systems and network codes.

Report Numbers:

E 1.99:inl/jou--16-38317
inl/jou--16-38317

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Published through SciTech Connect.
12/20/2016.
"inl/jou--16-38317"
Journal of Nuclear Engineering and Radiation Science 3 1 ISSN 2332-8983 AM
Donald M. McEligot; Richard W. Johnson.

Funding Information:

AC07-05ID14517

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