Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Transient Multicomponent Mixture Analysis Based On an ICE Numerical Technique for the Simulation of an Air Inggess Accident in an HTGR

  • Published : 2004.10.01
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Abstract

This paper presents a transient multicomponent mixture analysis tool developed to analyze the molecular diffusion, natural convection, and chemical reactions related to air ingress phenomena that occur during a primary-pipe rupture of a high temperature gas-cooled reactor (HIGR). The present analysis tool solves the one-dimensional basic equations for continuity, momentum, energy of the gas mixture, and the mass of each gas species. In order to obtain numerically stable and fast computations, the implicit continuous Eulerian scheme is adopted to solve the governing equations in a strongly coupled manner. Two types of benchmark calculations were performed with the data of prerious Japanese inverse U-tube experiments. The analysis program, based on the ICE technique, runs about 36 times faster than the FLUENT6 for the simulation of the two experiments. The calculation results are within a 10% deviation from the experimental data regarding the concentrations of the gas species and the onset times of natural convection.

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References

  1. J.O. Hirschfelder, C.F. Curtiss, and R.B. Bird, Molecular Theory of Gases and Liquids, 2nd Edition, Wiley (1964)
  2. B.E. Poling, J.M. Prausnitz, and J.P. O'connell, The Properties of Gases and Liquids, 5th ed.,McGraw-Hill (2001)
  3. K. Raznjevic, Handbook of Thermodynamic Tables and Charts, Hemisphere (1976)
  4. J. B. Howard, G. C. Williams, and D.H. Fine, 'Kinetics of carbon monoxide oxidation in postflame gases' 14th symposium(international) on combustion, 975(1973)
  5. H. Kawakami, 'Air oxidation behavior of carbon and graphite materials for HTGR' TANSO, 124, 26(1986)
  6. M. Ogawa, 'Mass transfer with graphite oxidation in gas mixture laminar flow through circular tube' J. At. Energy Soc. Jpn., 35(3), 245(1993) https://doi.org/10.3327/jaesj.35.245
  7. M. Takahashi, M. Kotaka, and H. Sekimoto, 'Burn-off and production of CO and $CO_2$ in the oxidation of nuclear reactor-grade graphites in a flow system' J. Nucl. Sci. Tech., 31(12), 1275(1994) https://doi.org/10.3327/jnst.31.1275
  8. E. L. Fuller and J. M. Okoh, 'Kinetics and mechanisms of the reaction of air with nuclear grade graphites: IG-110' J. of Nuclear Materials, 240, 241(1997) https://doi.org/10.1016/S0022-3115(96)00462-X
  9. T. Takeda and M. Hishida, 'Studies on molecular diffusion and natural convection in a multicomponent gas system,' Int. J. of Heat and Mass Transfer. 39(3), 527(1996) https://doi.org/10.1016/0017-9310(95)00148-3
  10. M. Rossberg, Z. Elektrochem., 60, 952 (1956)
  11. F.H. Harlow and A.A. Amsden, 'A numerical fluid dynamics calculation method for all flow speeds,' J. of Comp. Phy., 8 197(1971) https://doi.org/10.1016/0021-9991(71)90002-7
  12. M. Hishida and T. Takeda, 'Study on air ingress during an early stage of a primary-pipe rupture accident of a high-temperature gas-cooled reactor', Nucl. Eng. Des., 126, 175(1991) https://doi.org/10.1016/0029-5493(91)90109-U
  13. FLUENT 6.0 User's Guide, FLUENT Inc. (2002)