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TECHNICAL PAPERS

Numerical Analysis of Unsteady Conjugate Heat Transfer and Thermal Stress for a Curved Piping System Subjected to Thermal Stratification

[+] Author and Article Information
Jong Chull Jo, Young Hwan Choi, Seok Ki Choi

Korea Institute of Nuclear Safety, 19 Kusung-dong, Yusung-ku, Taejon 305-338, KoreaKorea Atomic Energy Research Institute, 150 Dukjin-dong, Yusung-ku, Taejon 305-353, Korea

J. Pressure Vessel Technol 125(4), 467-474 (Nov 04, 2003) (8 pages) doi:10.1115/1.1613947 History: Received April 30, 2003; Revised May 22, 2003; Online November 04, 2003
Copyright © 2003 by ASME
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References

NRC Bulletin 79-13, 1979, “Cracking in Feedwater System Piping,” US NRC.
NRC Bulletin 88-08, 1988, “Thermal Stresses in Piping Connected to Reactor Coolant Systems,” US NRC.
NRC Bulletin 88-11, 1988, “Pressurizer Surge Line Thermal Stratification,” US NRC.
NRC NUREG/CR-6456, 1989, Review of Industry Efforts to Manage Pressurized Water Reactor Feedwater Nozzle, Piping, and Feedering Cracking and Wall Thinning, US NRC.
Talja,  A., and Hansjosten,  E., 1990, “Results of Thermal Stratification Tests in a Horizontal Pipe Line at the HDR-Facility,” Nucl. Eng. Des., 118, pp. 29–41.
Wolf,  L. , 1992, “Results of HDR-Experiments for Pipe Loads under Thermally Stratified Flow Conditions,” Nucl. Eng. Des., 137, pp. 387–404.
Smith, W. R., Cassell, D. S., and Schlereth E. P., 1988, “A Solution for the Temperature Distribution in a Pipe Wall Subjected to Internally Stratified Flow,” Proc. Joint ASME-ANS Nuclear Power Conf., Myrtle Beach, SC, pp. 45–50.
Youm,  H. K., Park,  M. H., and Kim,  S. N., 1996, “The Unsteady 2-D Numerical Analysis in a Horizontal Pipe with Thermal Stratification Phenomena,” J. KNS, 28(1), pp. 27–35.
Jo, J. C., Kim, Y. I., Shin, W. K., and Choi, S. K., 2000, “Three-Dimensional Numerical Analysis of Thermally Stratified Flow in a Curved Piping System,” ASME PVP-Vol. 414-1, ASME, New York, pp. 31–48.
Baron, F., Gabillard, M., and Lacroix, C., 1989, “Experimental Study and Three-Dimensional Prediction of Recirculating and Stratified Pipe Flow in PWR,” Proc. NURETH 4, Karlsruhe, pp. 1354–1361.
Abou-rjeily,  Y., and Barois,  G., 1993, “Numerical Prediction of Stratified Pipe Flows in PWRs,” Nucl. Eng. Des., 147, pp. 47–51.
Baik, S. J., Im, I. Y., and Ro, T. S., 1998, “Thermal Stratification in the Surge Line of the Korean Next Generation Reactor,” Special Meeting on Experience with Thermal Fatigue in LWR Piping Caused by Mixing and Stratification, Proc. OECD NEA/WANO, Paris, France.
Jo,  J. C., Kim,  Y. I., and Choi,  S. K., 2001, “Numerical Analysis of Thermal Stratification in a Circular Pipe,” ASME J. Pressure Vessel Technol., 123, pp. 517–524.
Patankar, S. V., 1980, Numerical Heat Transfer and Fluid Flow, McGraw-Hill, New York, NY.
Peric, M., 1985, “A Finite Volume Methods for the Prediction of Three Dimensional Fluid Flow in Complex Ducts,” Ph.D. thesis, Mechanical Engineering Department, Imperial College, London, UK.
Zhu,  J., 1991, “A Low-Diffusive and Oscillation-Free Convection Scheme,” Commun. Appl. Numer. Methods, 7, pp. 225–232.
Ferziger, J. H., and Peric, M., 1997, Computational Methods for Fluid Dynamics, 2nd printing, Springer Verlag, Berlin Heidelberg, Germany.
Rhie,  C. M., and Chow,  W. L., 1983, “Numerical Study of the Turbulent Flow Past an Airfoil with Trailing Edge Separation,” AIAA J., 21(11), pp. 1525–1532.
Majumdar,  M., 1988, “Role of Under-Relaxation in Momentum Interpolation for Calculation of Flow with Non-staggered Grids,” Numer. Heat Transfer, 13, pp. 125–132.
Choi,  S. K., 1999, “Note on the Use of Momentum Interpolation Method for Unsteady Flows,” Numer. Heat Transfer, Part A, 36, pp. 545–550.
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Figures

Grahic Jump Location
Normalized effective stresses along the surge line model from the inlet nozzle to the outlet nozzle for the insurge and outsurge flow cases at 100 sec
Grahic Jump Location
PWR pressurizer surge line piping system subjected to internally thermal stratification (PRZ=pressurizer, RCS=reactor coolant system)
Grahic Jump Location
The simplified analysis model of pressurizer surge line pipe
Grahic Jump Location
(a) Development of temperature field at the symmetry plane of the surge line model for the case of insurge flow, where the direction of gravity for the case of insurge is downward (↓g) (b) Development of temperature field at the symmetry plane of the surge line model for the case of outsurge flow, where the direction of gravity for the case of outsurge is upward (↑g)
Grahic Jump Location
(a) Development of temperature field at the cross-sectional plane “A-A” of the surge line model (see Fig. 2) for the case of insurge flow, where the direction of gravity for the case of insurge is downward (↓g) (b) Development of temperature field at the cross-sectional plane “A-A” of the surge line model (see Fig. 2) for the case of outsurge flow, where the direction of gravity for the case of outsurge is upward (↑g)
Grahic Jump Location
Deformed shape of the surge line model with nondeformed shape.
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(a) Normalized effective stresses as a function of time for the case of insurge flow; and (b) normalized effective stresses as a function of time for the case of outsurge flow

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