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자료유형
학술저널
저자정보
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제51권 제4호
발행연도
2019.1
수록면
987 - 995 (9page)

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Steam jet condensation is of great importance to pressure suppression containment and automaticdepressurization system in nuclear power plant. In this paper, the condensation processes of sonic steamjet in a quiescent subcooled pool are recorded and analyzed, more precise understanding are got in directcontact condensation. Experiments are conducted at atmospheric pressure, and the steam is injected intothe subcooled water pool through a vertical nozzle with the inner diameter of 10 mm, water temperaturein the range of 25e60 C and mass velocity in the range of 320e1080 kg/m2s. Richardson number iscalculated based on the conservation of momentum for single water jet and its values are in the range of0.16e2.67. There is no thermal stratification observed in the water pool. Four condensation regimes areobserved, including condensation oscillation, contraction, expansion-contraction and double expansioncontractionshapes. A condensation regime map is present based on steam mass velocity and watertemperature. The dimensionless steam plume length increase with the increase of steam mass velocityand water temperature, and its values are in the range of 1.4e9.0. Condensation heat transfer coefficientdecreases with the increase of steam mass velocity and water temperature, and its values are in the rangeof 1.44e3.65 MW/m2 C. New more accurate semi-empirical correlations for prediction of the dimensionlesssteam plume length and condensation heat transfer coefficient are proposed respectively. Thediscrepancy of predicted plume length is within ± 10% for present experimental results and ± 25% forprevious researchers. The discrepancy of predicted condensation heat transfer coefficient is with ± 12%.

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