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Articles
  • Experimental research on CHF in narrow annuli   [MASS 2012]
  • Author(s)
  • WU Geping, Huang He
  • ABSTRACT
  • An experimental research on the dryout point of flow boiling in narrow annular channels under low mass flux with 1.55mm and 1.05mm annular gap respectively, is conducted. Distilled water is used as work fluid, the range of pressure is limited within 2.0~4.0MPa and that of mass flux is 26.0~69.0 kg·m-2·s-1. The relation of CHF and critical qualities with mass flux and pressure are revealed. It is found that the critical qualities decrease with the increasing mass flux and increase with the increasing inlet qualities in externally heated annuli. Under the same conditions critical qualities in outer tube are always larger than those in inner tube. The appearance of dryout point in bilaterally heated narrow annuli can be judged according to the ratio of qo/qi.
  • KEYWORDS
  • Narrow annular channel;Flow boiling;Dryout point
  • References
  • [1]
    Okawa, Kotani, Kataoka. Prediction of dryout heat flux in vertical round tubes with uniform and non-uniform heating, The 10th international topic meeting on nuclear reactor thermal hydraulics, October, 2003, Seoul, Korea.
    [2]
    B X Wang, J T Zhang, X F Peng, International Journal of Heat and Mass Transfer 2000,43: 1897-1903.
    [3]
    Knudsen J G, Katz D L. Fluid dynamics and heat transfer. New York: McGraw-Hill,1958:186-195.
    [4]
    Collier, J.G., Thome, J.R., 1994. Convective Boiling and Condensation, 3. Oxford University Press, Oxford, pp. 329-367.

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