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TECHNICAL PAPERS

Numerical Analysis of Thermal Stratification in a Circular Pipe

[+] Author and Article Information
Jong Chull Jo, Yun Il Kim

Korea Institute of Nuclear Safety, Taejon 305-338, Korea

Seok Ki Choi

Korea Atomic Energy Research Institute, Taejon 305-353, Korea

J. Pressure Vessel Technol 123(4), 517-524 (May 23, 2001) (8 pages) doi:10.1115/1.1388008 History: Received November 14, 2000; Revised May 23, 2001
Copyright © 2001 by ASME
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References

NRC Bulletin No. 88-08, 1988, “Thermal Stress in Piping Connected to Reactor Coolant System,” USNRC.
NRC Bulletin No. 88-11, 1988, “Pressurizer Surge Line Thermal Stratification,” USNRC.
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.
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.
Ensel,  C., Colas,  A., and Barthez,  M., 1995, “Stress Analysis of a 900 MW Pressurizer Surge Line Including Stratification Effects,” Nucl. Eng. Des., 153, pp. 197–203.
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., 178, pp. 211–220.
Jung,  I. S., Kim,  Y., Youm,  H. K., and Park,  M. H., 1996, “Thermal Stratification in a Horizontal Pipe of Pressurizer Surge Line,” Trans. KSME, B, 20, No. 4, pp. 1449–1457.
Zhu,  J., 1991, “A Low-Diffusive and Oscillation-Free Convection Scheme,” Commun. Appl. Numer. Methods, 7, pp. 225–232.
Patankar, S. V., 1980, Numerical Heat Transfer and Fluid Flow, McGraw-Hill, New York, NY.
Rhie,  C. M., and Chow,  W. L., 1983, “Numerical Study of the Turbulent Flow Past an Airfoil with Trailing Edge Separation,” AIAA J., 21, No. 11, pp. 1525–1532.
Jo, J. C., Kim, Y. I., and Choi, S. K., 1999, “Numerical Analysis of Thermally Stratified Flow in a Circular Pipe Line,” ASME PVP-Vol. 396, Emerging Technologies in Fluids, Structures, and Fluid/Structure Interactions, pp. 33–39.
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, Emerging Technologies in Fluids, Structures, and Fluid/Structure Interactions, pp. 31–47.

Figures

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Example of the thermally stratified flow in a circular pipe
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The curvilinear nonorthogonal mesh
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Typical control volume cell in the computing mesh
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Fluid-solid interface in an orthogonal grid
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Fluid-solid interface in a nonorthogonal grid
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Transient isotherms for the fluid interface level 0.5di
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Transient isotherms for the three different fluid interface levels at nondimensional times 100 (left), 1000 (center), and 1500 (right)—(a) level 0.25di, (b) level 0.50di, (c) level 0.75di
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The variation of the local Nusselt no. (Nu)
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Transient top to bottom wall temperature distributions—(a) for fluid interface level 0.25di, (b) for fluid interface level 0.50di, (c) for fluid interface level 0.75di
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Transient maximum wall temperature differences both on the inner and outer wall surfaces
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Nondimensional temperatures on the inner and outer wall surfaces—(a) at nondimensional time 1000, (b) at nondimensional time 1500

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