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Effect of Bend Curvature Ratio on Flow Pattern at a Mixing Tee after a 90 Degree Bend
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International Journal of Engineering (IJE)
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Volume:  3    Issue:  5
Pages:  413-520
Publication Date:   November 2009
ISSN (Online): 1985-2312
Pages 
478 - 487
Author(s)  
 
Published Date   
30-11-2009 
Publisher 
CSC Journals, Kuala Lumpur, Malaysia
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Keywords   Abstract   References   Cited by   Related Articles   Collaborative Colleague
 
KEYWORDS:   Mixing Phenomena, Secondary Flow, Phenix reactor 
 
 
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• Many nuclear power plants report high cycle thermal fatigue in their cooling system, caused by temperature fluctuation in a non-isothermal mixing area. One of these areas is the T-junction, in which fluids of various temperatures and velocities blend. The objective of this research is to classify turbulent jet mechanics in order to examine the flow-field structure under various operating conditions. Furthermore, this research discovers the optimum operating conditions of the mixing tee in this piping system. An experimental model, including the T-junction with a 90 degree bend upstream, is operated to analyze this mixing phenomenon based on the real operation design of the Phenix Reactor. The temperature and velocity data show that a 90 degree bend has a strong effect on the fluid mixing mechanism and the momentum ratio between the main velocity and the branch velocity of the T-junction, which could be an important parameter for the classification of the fluid mixing mechanism. By comparing their mean velocity distributions, velocity fluctuations and time-series data, the behavior of the branch jet is categorized into four types of turbulent jets; sorted from the highest to the lowest momentum ratios, the jets are categorized as follows: the wall jet, the re-attached jet, the turn jet, and the impinging jet. Ultimately, the momentum ration of the turn jet was selected as the optimum operating condition as it has the lowest velocity and the lowest temperature fluctuations near the wall of the mixing tee. By changing the bending ratio from 1.41 to 1.0 the results show that most of data are in the turn jet region. Therefore, with the sharpened bend, the re-attached region is compressed. 
 
 
 
1 Faidy C., “EPRI-US NRC-OECD NEA”. In Third International Conference on Fatigue of reactor Components, Seville, Spain, 2004
2 Igarashi M. “Study on Fluid Mixing Phenomena for Evaluation of Thermal Striping in A Mixing Tee”. In 10th International Topical Meeting on Nuclear Reactor Thermal Hydraulic, NURETH-10, Seoul, Korea, 2003.
3 Hosseini S.M. “ Experimental investigation of thermal-hydraulic characteristics at a mixing tee, in”.In International Heat Transfer Conference, FCV-17, Sydney, Australia, 2006.
4 Hosseini S.M. “ The three-dimensional study of flow mixing phenomenon”. In International Conference Nuclear Energy for New Europe, ID: 037, Bled, Slovenia, September 2005.
5 Hosseini S.M. “ Visualization of fluid mixing phenomenon”. Sixth International Congress on Advances in Nuclear Power Plants, ICAPP05, ID: 5006 (R006), Seoul, Korea, May 2005.
6 Yuki K. “ vol. 2, 2001, pp. 1573–1578”. In Proceedings of the Fifth World Conference on Experimental Heat Transfer Fluid Mechanics and Thermodynamics, Japan, 2004.
7 Yuki K. “ID: N6P082”.In Proceedings of the 15th International Conference on Nuclear Thermal Hydraulic, Operation and Safety (NUTHOS-6), Nara, Japan, 2004.
8 H.C. Kao. “Some aspects of bifurcation structure of laminar flow in curved ducts”, J. Fluid Mech., pp. 519–539(1992).
 
 
 
 
 
 
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Mohammad Reza Nematollahi : Colleagues
Mazyar Asmani : Colleagues
Mohammad Nazififard : Colleagues
Hidetoshi Hashizumeh : Colleagues  
 
 
 
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