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Burnout Conditions for Flow of Boiling Water in Vertical Rod Clusters

Abstract

This paper deals with a new concept for predicting burnout conditions for forced convection of boiling water in fuel elements of nuclear boiling reactors. The concept states the importance of considering the ratio of heated channel perimeter to total channel perimeter. The perimeter ratio concept was arrived at from an experimental study of burnout conditions in rod clusters consisting of three rods of 13 mm outside diameter and 970 mm heated length. Data were obtained for pressures between{sub 2}. 5 and 10 kg/cm, surface heat fluxes between 50 and 120 W/cm, mass flow rates between 0.03 and 0.33 kg/sec and steam qualities between 0.01 and 0.52. The rod distances for the experiment were 2 mm and 6 mm. The diameter of the channel was 41.3 mm. Additional runs were also performed after introducing unheated displacement rods in the channel. The rod distance in this case was 6 mm. In the ranges investigated the measured burnout steam qualities at the outlet of the channel decreases with increasing heat flux and decreasing pressure. Furthermore it has been found that the influence of rod distance is, in the range investigated, of small significance for engineering purposes. It has also been observed that the  More>>
Authors:
Publication Date:
May 15, 1962
Product Type:
Technical Report
Report Number:
AE-74
Resource Relation:
Other Information: 13 refs., 17 figs., 3 tabs.
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; 42 ENGINEERING; TWO-PHASE FLOW; FLOW RATE; DUCTS; BURNOUT; BWR TYPE REACTORS; FUEL ELEMENT CLUSTERS
OSTI ID:
20930886
Research Organizations:
AB Atomenergi, Nykoeping (Sweden)
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
TRN: SE0708304
Availability:
Commercial reproduction prohibited; OSTI as DE20930886
Submitting Site:
SWDN
Size:
48 pages
Announcement Date:
Sep 29, 2007

Citation Formats

Becker, Kurt M. Burnout Conditions for Flow of Boiling Water in Vertical Rod Clusters. Sweden: N. p., 1962. Web.
Becker, Kurt M. Burnout Conditions for Flow of Boiling Water in Vertical Rod Clusters. Sweden.
Becker, Kurt M. 1962. "Burnout Conditions for Flow of Boiling Water in Vertical Rod Clusters." Sweden.
@misc{etde_20930886,
title = {Burnout Conditions for Flow of Boiling Water in Vertical Rod Clusters}
author = {Becker, Kurt M}
abstractNote = {This paper deals with a new concept for predicting burnout conditions for forced convection of boiling water in fuel elements of nuclear boiling reactors. The concept states the importance of considering the ratio of heated channel perimeter to total channel perimeter. The perimeter ratio concept was arrived at from an experimental study of burnout conditions in rod clusters consisting of three rods of 13 mm outside diameter and 970 mm heated length. Data were obtained for pressures between{sub 2}. 5 and 10 kg/cm, surface heat fluxes between 50 and 120 W/cm, mass flow rates between 0.03 and 0.33 kg/sec and steam qualities between 0.01 and 0.52. The rod distances for the experiment were 2 mm and 6 mm. The diameter of the channel was 41.3 mm. Additional runs were also performed after introducing unheated displacement rods in the channel. The rod distance in this case was 6 mm. In the ranges investigated the measured burnout steam qualities at the outlet of the channel decreases with increasing heat flux and decreasing pressure. Furthermore it has been found that the influence of rod distance is, in the range investigated, of small significance for engineering purposes. It has also been observed that the present burnout steam quality data for the rod clusters are much lower than those earlier obtained for round ducts. This may be explained physically by means of the perimeter ratio concept. It has also been found that the surface shear-stress distribution around the channel perimeter and especially the position of maximum shear-stress is of great importance for predicting burnout conditions for flow in channels. Finally the new method has helped us to understand and interpret experimental results which earlier may have seemed inconsistent.}
place = {Sweden}
year = {1962}
month = {May}
}