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 PIV 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 the elbow is 56mm and the curvature radius ratio is 1.5. Reynolds number in this experiment is 4×104. 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.
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16th International Conference on Nuclear Engineering
May 11–15, 2008
Orlando, Florida, USA
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
0-7918-4816-7
PROCEEDINGS PAPER
Specificity of Flow Structure in a Dual Elbow and Its Visualization by PIV Measurement
Kazuhiro Yoshida,
Kazuhiro Yoshida
Tohoku University, Sendai, Miyagi, Japan
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Yuki Kazuhisa,
Yuki Kazuhisa
Tohoku University, Sendai, Miyagi, Japan
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Hidetoshi Hashizume,
Hidetoshi Hashizume
Tohoku University, Sendai, Miyagi, Japan
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Saburo Toda
Saburo Toda
Tohoku Radiation Science Center, Japan
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Kazuhiro Yoshida
Tohoku University, Sendai, Miyagi, Japan
Yuki Kazuhisa
Tohoku University, Sendai, Miyagi, Japan
Hidetoshi Hashizume
Tohoku University, Sendai, Miyagi, Japan
Saburo Toda
Tohoku Radiation Science Center, Japan
Paper No:
ICONE16-48231, pp. 293-299; 7 pages
Published Online:
June 24, 2009
Citation
Yoshida, K, Kazuhisa, Y, Hashizume, H, & Toda, S. "Specificity of Flow Structure in a Dual Elbow and Its Visualization by PIV Measurement." Proceedings of the 16th International Conference on Nuclear Engineering. Volume 3: Thermal Hydraulics; Instrumentation and Controls. Orlando, Florida, USA. May 11–15, 2008. pp. 293-299. ASME. https://doi.org/10.1115/ICONE16-48231
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