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Measurements of Burnout Conditions for Flow of Boiling Water in Vertical 3-Rod and 7-Rod Clusters

Abstract

The present report deals with measurements of burnout conditions for flow of boiling water in vertical 3-rod and 7-rod clusters. Data were obtained,in respect of heating the rods only, as well as for simultaneous uniform and non-uniform heating of the rods and the shroud. Totally, 520 runs were performed. In the case of equal heat fluxes on all surfaces of the channels, burnout always occurred on the rods, and the data were low by a factor of about 1.3 compared with round duct data. When only the rods were heated, the data showed very low burnout values in comparison with the results for total uniform heating and round ducts. This disagreement was explained by considering the climbing film flow model and the fact that only a fraction of the channel perimeter was heated. For simultaneous and non-uniform heating of the rods and the shroud it was found that the shroud could be overloaded up to 50 per cent without reducing the margin of safety in respect of burnout for the rod cluster. Finally, a correlation for predicting burnout conditions in round ducts, annuli and rod clusters has been presented. This correlation predicts the burnout heat fluxes for the present measurements  More>>
Publication Date:
Aug 15, 1964
Product Type:
Technical Report
Report Number:
AE-153
Resource Relation:
Other Information: 8 refs., 28 figs., 8 tabs.
Subject:
42 ENGINEERING; TWO-PHASE FLOW; PRESSURE DEPENDENCE; FLOW RATE; FLUID FLOW; BURNOUT; FUEL ELEMENT CLUSTERS; MASS TRANSFER; WATER
OSTI ID:
20931033
Research Organizations:
AB Atomenergi, Nykoeping (Sweden)
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
TRN: SE0708425
Availability:
Commercial reproduction prohibited; OSTI as DE20931033
Submitting Site:
SWDN
Size:
60 pages
Announcement Date:
Sep 29, 2007

Citation Formats

Becker, Kurt M, Hernborg, G, and Flinta, J E. Measurements of Burnout Conditions for Flow of Boiling Water in Vertical 3-Rod and 7-Rod Clusters. Sweden: N. p., 1964. Web.
Becker, Kurt M, Hernborg, G, & Flinta, J E. Measurements of Burnout Conditions for Flow of Boiling Water in Vertical 3-Rod and 7-Rod Clusters. Sweden.
Becker, Kurt M, Hernborg, G, and Flinta, J E. 1964. "Measurements of Burnout Conditions for Flow of Boiling Water in Vertical 3-Rod and 7-Rod Clusters." Sweden.
@misc{etde_20931033,
title = {Measurements of Burnout Conditions for Flow of Boiling Water in Vertical 3-Rod and 7-Rod Clusters}
author = {Becker, Kurt M, Hernborg, G, and Flinta, J E}
abstractNote = {The present report deals with measurements of burnout conditions for flow of boiling water in vertical 3-rod and 7-rod clusters. Data were obtained,in respect of heating the rods only, as well as for simultaneous uniform and non-uniform heating of the rods and the shroud. Totally, 520 runs were performed. In the case of equal heat fluxes on all surfaces of the channels, burnout always occurred on the rods, and the data were low by a factor of about 1.3 compared with round duct data. When only the rods were heated, the data showed very low burnout values in comparison with the results for total uniform heating and round ducts. This disagreement was explained by considering the climbing film flow model and the fact that only a fraction of the channel perimeter was heated. For simultaneous and non-uniform heating of the rods and the shroud it was found that the shroud could be overloaded up to 50 per cent without reducing the margin of safety in respect of burnout for the rod cluster. Finally, a correlation for predicting burnout conditions in round ducts, annuli and rod clusters has been presented. This correlation predicts the burnout heat fluxes for the present measurements and previously obtained annuli measurements within {+-} 5 per cent.}
place = {Sweden}
year = {1964}
month = {Aug}
}