Analysis of flow distribution a PWR fuel rod bundle model containng A 90% blockage |
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| Authors: | M.L. Ang A. Aytekin A.H. Fox |
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| Affiliation: | 1. Department of Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, CA 94305, USA;2. Department of Structural Biology, Stanford University School of Medicine, Stanford, CA 94305, USA;3. Department of Biochemistry and Molecular Genetics, Simpson Querrey Center for Epigenetics, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA;4. Department of Biochemistry, Microbiology, and Immunology, Ottawa Institute of Systems Biology, University of Ottawa, Ottawa ON K1H 8M5, Canada;5. Northwestern Synchrotron Research Center, Life Sciences Collaborative Access Team, Northwestern University, Argonne, IL 60439, USA;1. Bhabha Atomic Research Centre Facilities, HBNI, Kalpakkam, India;2. Indira Gandhi Centre for Atomic Research, HBNI, Kalpakkam, India;1. Nuclear Research Center of Birine, BP 180 Ain Oussera, Djelfa, Algeria;2. Atomic Energy Commission, 02 bd Frantz Fanon, BP 399, Algiers, Algeria;1. Department of General Surgery, Gundersen Health System, La Crosse, Wisconsin;2. Department of Research, Gundersen Medical Foundation, La Crosse, Wisconsin;1. Institite of Nuclear Science and Technology, Xi’an Jiaotong University, Xi’an 710049, China;2. College of Engineering, The University of Wisconsin-Madison, Madison 53706, United States;3. Department of Engineering Physics, Tsinghua University, Beijing 100084, China |
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| Abstract: | An experimental investigation, covering a Reynolds number range from 2 × 103 to 3.5 × 104, was conducted to study the velocity and turbulence intensity distributions due to the presence of a blockage in an unheated 7 × 7 rod bundle. The blockage configuration, consisting of a 4 × 4 rod array, created a maximum flow area reduction of 90% in the central nine subchannels. The blockage sleeve length was 38.3 × rod diameter and the 90% blockage zone length extended for 16.4 × rod diameter. The results showed that upstream of the blockage, the flow was not influenced by the blockage until it reached the location where the inlet taper section of the swelling started. At the downstream end, the flow disturbance was extensive and persisted over a distance of about 83 rod diameters. Compared to the downstream velocity profiles, the turbulence intensity measurements however showed a faster recovery from the blockage influence. At the higher Reynolds number, velocity profiles calculated using the COBRA subchannel computer code compared consistently with the experimental data. The general flow behaviour of the various subchannels was reasonably well predicted. However, at low Reynolds number, due mainly to the frictional form loss calculation scheme in COBRA and uncertainty in the flow transition, the flow diversion due to the blockage to the surrounding unblocked subchannels was overestimated. The influence of the degree of recovery from the rod swelling on the flow was also studied using COBRA. |
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