Fluid-elastic instability characteristics of a U-tube bundle were experimentally investigated in air-water two-phase flow. A total of 39 U-tubes were arranged in a rotated square array with a pitch-to-diameter ratio of 1.633. Vibration responses of four U-tubes were measured with three-axis accelerometers. Two sets of experiments were performed to investigate the onset of fluid-elastic instability, and the damping and hydrodynamic mass of the U-tube. The experiments were performed for a void fraction of 70–95%. Fluid-elastic instability was clearly observed in an out-of-plane mode vibration. The effect of a primary side flow on the vibration of U-tube was investigated separately. The damping ratio of the present U-tube was higher than the damping ratio of the cantilever tubes in the literature. The hydrodynamic mass of the U-tube was generally in accordance with the hydrodynamic mass of the cantilever tubes in the literature. The instability constant of the Connors equation was assessed with a simplified effective gap velocity, and the fluid-elastic instability constant was 8.5.
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August 2009
Research Papers
Fluid-Elastic Instability of Rotated Square Array U-Tubes in Air-Water Flow
In-Cheol Chu,
In-Cheol Chu
Thermal Hydraulics Safety Research Division,
e-mail: chuic@kaeri.re.kr
Korea Atomic Energy Research Institute
, 1045 Daedeokdaero, Yuseong-gu, Daejeon 305-353, Korea
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Heung June Chung,
Heung June Chung
Thermal Hydraulics Safety Research Division,
Korea Atomic Energy Research Institute
, 1045 Daedeokdaero, Yuseong-gu, Daejeon 305-353, Korea
Search for other works by this author on:
Chang Hee Lee
Chang Hee Lee
Thermal Hydraulics Safety Research Division,
Korea Atomic Energy Research Institute
, 1045 Daedeokdaero, Yuseong-gu, Daejeon 305-353, Korea
Search for other works by this author on:
In-Cheol Chu
Thermal Hydraulics Safety Research Division,
Korea Atomic Energy Research Institute
, 1045 Daedeokdaero, Yuseong-gu, Daejeon 305-353, Koreae-mail: chuic@kaeri.re.kr
Heung June Chung
Thermal Hydraulics Safety Research Division,
Korea Atomic Energy Research Institute
, 1045 Daedeokdaero, Yuseong-gu, Daejeon 305-353, Korea
Chang Hee Lee
Thermal Hydraulics Safety Research Division,
Korea Atomic Energy Research Institute
, 1045 Daedeokdaero, Yuseong-gu, Daejeon 305-353, KoreaJ. Pressure Vessel Technol. Aug 2009, 131(4): 041301 (8 pages)
Published Online: June 12, 2009
Article history
Received:
January 3, 2008
Revised:
February 11, 2009
Published:
June 12, 2009
Citation
Chu, I., Chung, H. J., and Lee, C. H. (June 12, 2009). "Fluid-Elastic Instability of Rotated Square Array U-Tubes in Air-Water Flow." ASME. J. Pressure Vessel Technol. August 2009; 131(4): 041301. https://doi.org/10.1115/1.3148187
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