Browse > Article
http://dx.doi.org/10.3795/KSME-B.2009.33.5.381

Numerical Analyses to Simulate Thermal Stratification Phenomenon in a Piping System  

Jeong, Jae-Uk (성균관대학교 기계공학부)
Kim, Sun-Hye (성균관대학교 기계공학부)
Chang, Yoon-Suk (성균관대학교 기계공학부)
Choi, Jae-Boong (성균관대학교 기계공학부)
Kim, Young-Jin (성균관대학교 기계공학부)
Kim, Jin-Su (한국원자력안전기술원 기계재료실)
Chung, Hae-Dong (한국원자력안전기술원 기계재료실)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.33, no.5, 2009 , pp. 381-388 More about this Journal
Abstract
In some portions of nuclear piping systems, stratification phenomena may occur due to the density difference between hot and cold stream. When the temperature difference is large, the stratified flow under diverse operating conditions can produce high thermal stress, which leads to unanticipated piping integrity issues. The objectives of this research are to examine controvertible numerical factors such as model size, grid resolution, turbulent parameters, governing equation, inflow direction and pipe wall. Parametric three-dimensional computational fluid dynamics analyses were carried out to quantify effects of these parameters on the accuracy of temperature profiles in a typical nuclear piping with complex geometries. Then, as a key finding, it was recommended to use optimized mesh of real piping with the conjugated heat transfer condition for accurate thermal stratification analyses.
Keywords
Finite Volume Method; Surge Line; Thermal Stratification Flow; Turbulence Model;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
Times Cited By SCOPUS : 0
연도 인용수 순위
1 SI, 1990, 'Evaluation of Pressurizer Surge Line Thermal Stratification for Maanshan Nuclear Power Station Unit 1 and 2,' SIR-90-052
2 Yeom, H.K. and Park, M.H., 1996, 'Unsteady Thermal Stratified Flow and Heat Transfer in a Horizontal Feedwater Pipe,' Korea Society of Mechanical Engineers (KSME) Transaction (B), Vol.20, No.2, pp. 680-688   과학기술학회마을
3 Jo, J.C. Kim, I.Y. and Choi, S.K., 2001, 'Numerical Analysis of Thermal Stratification in a Circular Pipe,' J. of Pressure Vessel Technology, Vol.123, pp. 517-524   DOI   ScienceOn
4 Jo, J.C., Choi, Y.H. and Choi, S.K and Choi, H.K., 2003, 'Numerical Analysis of Unsteady Conjugate Heat Transfer and Thermal Stress for a Curved Piping System Subjected to Thermal Stratification,' J. of Pressure Vessel Technology, Vol.125, pp. 467-474   DOI   ScienceOn
5 Par, G.M. and Bong, T.G., 'A Study on the Critical Reynolds Number of Steady, Oscillatory and Pulsating Flow in a Straight Duct,' J. of the Korean Society of Marine Engineers, Vol.22, No.1, pp.16-20   과학기술학회마을
6 EPRI, 1994, 'Thermal Stratification, Cycling and Striping (TASCS),' TR–103581
7 Westinghouse, 1988, 'Farley Unit 2 Engineering Evaluation of the Weld Joint Crack in the 6' SI/RHR Piping,' WCAP–11786
8 Framatome, 1988, 'RHRS Elbow Cracking at Civaux 1,' Significant Event Report No. 14
9 Yu, Y.J., Park, S.H., Sohn, G.H. and Bak, W.J., 1997, 'Structural Evaluation of Thermal Stratification for PWR Surge Line,' Nucl. Eng. Des., Vol.178, pp. 211-220   DOI   ScienceOn
10 Choi, S.K., Kim, S.Y. and Kim, S.O., 2005, 'Evaluation of Turbulence Models for Analysis of Thermal Stratification,' KSCFE J. of Computational Fluids Engineering, Vol.10, No.4, pp. 12-17   과학기술학회마을
11 Park, M.H., Kim, K.C. and Lee, S.C., 2006, 'A Study on the Mitigation Schemes of Thermal Stratification Phenomenon in a Branch Piping,' SAREK J. of Air-conditioning and Refrigeration Engineering, Vol.18, No.7, pp. 603-611   과학기술학회마을
12 KINS, 2007, 'Fatigue Life Analysis of Surge Line and Branch Line of Kori Unit 1,' KINS/HR–827
13 Fluent inc., Fluent Ver. 6.2, 'Documentation; Fluent 6.2 User's Guide.'
14 Launder , B. E. and Spalding , D. B., 1972, 'Lectures in Mathematical Models of Turbulence,' Academic Press, London, England
15 Abou-rjeily, Y. and Barois, G.., 1993, 'Numerical Prediction of Stratified Pipe Flows in PWRs,' Nucl. Eng. & Des., Vol.147, pp. 47-51   DOI   ScienceOn
16 Jung, I.S., Kim, Y., Youm H.K. and Par, M.H., 1996, 'Thermal Stratification in a Horizontal Pipe of Pressurizer Surge Line,' Korea Society of Mechanical Engineers (KSME) Transaction (B), Vol.20, No.4, pp. 1449-1457   과학기술학회마을
17 US NRC, 1988, 'Thermal Stress in Piping Connected to Reactor Coolant System,' NRC Bulletin No. 88–08
18 US NRC, 1988, 'Pressurizer Surge Line Thermal Stratification,' NRC Bulletin No.88–11
19 ABB-CE, 1994, 'Evaluation of Surge Line Stratification Test for Yonggwan Nuclear Power Unit 3,' Z190-TE-500
20 Jeong, J.U., Chang, Y.S., Choi, J.B., Kim, Y.J., Kim, J.S., Lee, J.H. and Chung, H.D., 'Parametric CFD Analyses to Simulated Stratified Flows,' Trans. of ASME PVP conference, PVP2008-61659