Prediction of Countercurrent Flow Limitation and Its Uncertainty in Horizontal and Slightly Inclined Pipes

Murase, Michio; Utanohara, Yoichi; Kusunoki, Takayoshi; Yamamoto, Yasunori; Lucas, Dirk; Tomiyama, Akio

doi:10.13182/nt16-96

Cited by 7 publications

(1 citation statement)

References 24 publications

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“…Previously, we (Murase et al [1]) developed a onedimensional computation method with parameters adjusted from CCFL data in hot leg and pressurizer surge line models (Mayinger et al [2]; Minami et al [3]; Futatsugi et al [4]), and we could predict CCFL in nearly horizontal pipes for the hot leg and pressurizer surge line within a practical uncertainty. There are only a few CCFL experiments simulating the pressurizer surge line with a diameter of about 300 mm.…”

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confidence: 99%

Effects of Diameters on Countercurrent Flow Limitation at a Square Top End in Vertical Pipes

Murase¹,

Nishida²,

Torige³

et al. 2018

Science and Technology of Nuclear Installations

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The falling liquid flow rate under flooding conditions is limited at a square top end of a vertical pipe in the pressurizer surge line with the diameter of about 300 mm that consists of a vertical pipe, a vertical elbow, and a slightly inclined pipe with elbows. In this study, therefore, we evaluated effects of diameters on countercurrent flow limitation (CCFL) at the square top end in vertical pipes by using existing air-water data in the diameter range of D = 19-250 mm. As a result, we found that there was a strong relationship between the constant CK and the slope m in the Wallis-type correlation where the Kutateladze parameters were used for the dimensionless gas and liquid velocities. The constant CK and the slope m increased when the water level is increased in the upper tank h. CCFL at the square top end of the vertical pipes could be expressed by the Kutateladze parameters with CK = 1.53±0.11 and m = 0.97 for D ≥ 30 mm. The CK values were smaller for D = 19-25 mm than those for D ≥ 30 mm.

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