3-DIMENSIONAL VISUALIZATION OF VOID FRACTION DISTRIBUTION IN STEADY 2-PHASE FLOW BY THERMAL-NEUTRON RADIOGRAPHY

Citation
N. Takenaka et al., 3-DIMENSIONAL VISUALIZATION OF VOID FRACTION DISTRIBUTION IN STEADY 2-PHASE FLOW BY THERMAL-NEUTRON RADIOGRAPHY, Nuclear Engineering and Design, 184(2-3), 1998, pp. 203-212
Citations number
11
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Nuclear Sciences & Tecnology
ISSN journal
0029-5493
Volume
184
Issue
2-3
Year of publication
1998
Pages
203 - 212
Database
ISI
SICI code
0029-5493(1998)184:2-3<203:3VOVFD>2.0.ZU;2-0
Abstract
Three-dimensional void fraction distributions of a steady air-water tw o-phase flow in a 4 x 4 rod-bundle with circular ferrule type spacers were measured by neutron radiography using a CT method. The high flux thermal neutron radiography system at JRR-3M in JAERI was used. Two-ph ase flow was visualized with a SIT tube camera and time-averaged one-d imensional cross sectional averaged void fraction distributions were c alculated. Visualization with high spatial resolution up to 0.18 mm wa s carried out by using a cooled CCD camera. Projections in 250 directi ons were obtained and were reconstructed by a filtered back projection method after using some image processing techniques. Animations were made to show the three-dimensional distributions. One-dimensional and three-dimensional void fraction distributions of the steady state two- phase flow in the rod bundle near the spacer were clearly visualized. (C) 1998 Elsevier Science S.A. All rights reserved.