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Journal of Enhanced Heat Transfer
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ISSN Druckformat: 1065-5131
ISSN Online: 1563-5074

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v8.i2.60
pages 137-146

Correlation Between the Critical Heat Flux and the Fractal Surface Roughness of Zirconium Alloy Tubes

R. W. L. Fong
Atomic Energy of Canada Limited, Chalk River Laboratories, Chalk River, Ontario, Canada KOJ 1J0
G. A. McRae
Atomic Energy of Canada Limited, Chalk River Laboratories, Chalk River, Ontario, Canada KOJ 1J0
C. E. Coleman
Atomic Energy of Canada Limited, Chalk River Laboratories, Chalk River, Ontario, Canada KOJ 1J0
Thambiayah Nitheanandan
Atomic Energy of Canada Limited, Whiteshell Laboratories, Pinawa, Manitoba, Canada ROE 1L0
D. B. Sanderson
AECL, Whiteshell Laboratories Pinawa, Manitoba ROE 1LO

ABSTRAKT

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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