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Critical too-Phase flow rates of subcooled water through Short Pipes (L 140039n) with small diameters (D$\leq$7.15 min) have been experimentally investigated for wide ranges of subcooling (0~199$^{\circ}C$) and pressure (0.5~2.0 MPa). To examine the effects of various parameters (i.e., the location of flashing inception, the degree of subcooling, the stagnation temperature and pressure, and the pipe size) on the critical two-phase flow rates of subcooled water through short pipes with small diameters, a total of 135 runs were made for various combinations of test parameters using four different L/D test sections. Experimental results that show effect of various parameters on subcooled critical two phase flow rates are presented in the form of graphs such as the dimensionless mass flux ( $G^{*}$) versus the dimensionless subcooling ( $T_{sub}$$^{*}$) curve. An empirical correlation expressed in terms of a dimensionless subcooling is also obtained for subcooled two-phase flow rates through present test sections. Comparisons between the mass fluxes calculated by present correlation and a total of 755 selected experimental data points of 9 different investigators show that the agreement is fairly good except for very low subcooling data obtained from small L/D (less than 10) orifices.s.s.s.

참고문헌 (12)

  1. Two-Phase Critical Flow , E. Elias;G. S. Lellouche , Int. J. Multi-phase Flow / v.20,pp.91-168, 1994
  2. A Qualified Database for the Critical Flow of Water , V. Ilic;S. Banerjee;S. Behling , EPRI NP-4556 / v.,pp., 1986
  3. The Marviken Full-Scale Critical Flow Tests , NUREG/CR-2671, MXC-301 / v.,pp., 1982
  4. A Generalized Unified Non-Equilibrium Model for Predicting Saturated and Subcooled Critical Two-Phase Flow Rates Through Short and Long Tubes , D.W.H. Fraser;A.H. Abdelmessih , Proceeding of the 7th International Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-7, Held at sheraton Hotel & Convention Center, Saratoga Springs, New York, NUREG/CP-0142 / v.3,pp.264-283, 1995
  5. Critical Discharge of Initially Subcooled Water Through Slits , C.N. Amos;V.E. Schrock , NUREG/CR-3475 / v.,pp., 1983
  6. Flashing Flows or : Some Practical Guidelines for Emergency Releases , H.K. Fauske , Plant/Operations Progress / v.4,pp.132-134, 1985
  7. Critical Two-Phase Flow through Rough Slits , H. John(et al.) , Int. J. Multiphase Flow / v.14,pp.155-174, 1988
  8. Two-Phase Flow Models in Unbounded Two-Phase Critical Flows , G.P. Celata(et al.) , Nuclear Engineering and Design / v.97,pp.211-222, 1986
  9. Auto Vaporization d'Ecoulements Eau/Vapeur , C. Jeandey(et al.) , CEN de Grenoble, Report T.T. No. 163 / v.,pp., 1981
  10. Critical Flow of Saturated and Subcooled Water at High Pressure , G.L. Sozzi;W.A. Sutherland , NEDO-13418 / v.,pp., 1975
  11. A Contribution a I'Etude des Debits Critiques en Recoulement Diphasique Eau/Vapeur , M. Reocreux , Doctoral Dissertation a I'Universite Scientifique et Medicale de Grenoble / v.,pp., 1974
  12. Flow of Subcooled Water Through Nozzles , A. W. Powell , WAPD-PT(Ⅴ)-90 / v.,pp., 1961

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