Publicou 8 edições por ano
ISSN Imprimir: 1065-5131
ISSN On-line: 1563-5074
IF:
2.3
5-Year IF:
1.8
Immediacy Index:
0.2
Eigenfactor:
0.00037
JCI:
0.6
SJR:
0.433
SNIP:
0.593
CiteScore™::
4.3
H-Index:
35
Indexed in
Correlation Between the Critical Heat Flux and the Fractal Surface Roughness of Zirconium Alloy Tubes
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RESUMO
In CANDU® fuel channels, Zircaloy calandria tubes isolate the hot pressure tubes from the cool heavy water moderator. The heavy-water moderator provides a backup heat sink during some postulated loss-of-coolant accidents. The decay heat from the fuel is transferred to the moderator to ensure fuel channel integrity during emergencies. Moderator temperature requirements are specified to ensure that the transfer of decay heat does not exceed the critical heat flux (CHF) on the outside surface of the calandria tube. An enhanced CHF provides increases in safety margin. Pool boiling experiments indicate the CHF is enhanced with glass-peening of the outside surface of the calandria tubes. The objective of this study was to evaluate the surface characteristics of glass-peened tubes and relate these characteristics to CHF. The microtopologies of the tube surfaces were analysed using stereo-pair micrographs obtained from scanning electron microscopy (SEM) and photogrammetry techniques. A linear correlation was found between the CHF and the ‘fractal’ surface roughness of the tubes.
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