Specificity of flow structure in a dual elbow and its visualization by PIV measurement

Kazuhiro Yoshida, Yuki Kazuhisa, Hidetoshi Hashizume, Saburo Toda

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

A large number of pipe failures caused by wall thinning have been reported in nuclear power plants, some of which occur in a dual elbow or the vicinity of it. These pipe failures could be influenced by complex flow induced in the elbow. This study, therefore, aims at predicting the whole flow structure in the dual elbow as the first step by taking a secondary flow after the elbow by Ply measurement. A test section consists of two elbows that are 2-dimentionally connected with/without a straight pipe. They are made of acrylic resin. The diameter of thc elbow is 56mm and the curvature radius ratio is 1.5. Reynolds number in this experiment is 4x I It is confirmed that the flow structure in the dual elbow has specificity depending on the inlet flow condition to the elbow and that the secondary flow itself has swirling motion in a streamwise direction. The dual elbow seems to generate more complex and unstable flow field even when the flow field at the inlet of the elbow slightly changes from a fully developed flow. However, there is a strong possibility that putting a straight pipe between the two elbows makes it ease the occurrence of the complex flow field.

Original languageEnglish
Title of host publication2008 Proceedings of the 16th International Conference on Nuclear Engineering, ICONE16
Pages293-299
Number of pages7
DOIs
Publication statusPublished - 2008
Event16th International Conference on Nuclear Engineering, ICONE16 2008 - Orlando, FL, United States
Duration: 2008 May 112008 May 15

Publication series

NameInternational Conference on Nuclear Engineering, Proceedings, ICONE
Volume3

Other

Other16th International Conference on Nuclear Engineering, ICONE16 2008
CountryUnited States
CityOrlando, FL
Period08/5/1108/5/15

ASJC Scopus subject areas

  • Nuclear Energy and Engineering

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  • Cite this

    Yoshida, K., Kazuhisa, Y., Hashizume, H., & Toda, S. (2008). Specificity of flow structure in a dual elbow and its visualization by PIV measurement. In 2008 Proceedings of the 16th International Conference on Nuclear Engineering, ICONE16 (pp. 293-299). (International Conference on Nuclear Engineering, Proceedings, ICONE; Vol. 3). https://doi.org/10.1115/ICONE16-48231