One-dimensional (1D) sensitivity computations were carried out for air–water countercurrent flows in a -scale model of the hot leg and a -scale model of the pressurizer surge line in a pressurized water reactor (PWR) to generalize the prediction method for countercurrent flow limitation (CCFL) characteristics in slightly inclined pipes with elbows. In the 1D model, the wall friction coefficient of single-phase gas flows was used. The interfacial drag coefficient of , an appropriate adjustment factor of for the wall friction coefficient of single-phase liquid flows ( for of single-phase gas flows), and an appropriate adjustment factor of for the pressure loss coefficient of elbows in single-phase flows were determined to give good agreement between the computed and measured CCFL characteristics. The adjusted factors were used to compute and then discuss effects of the inclination angle and diameter on CCFL characteristics.
Countercurrent Flow Limitation in Slightly Inclined Pipes With Elbows
Manuscript received February 17, 2015; final manuscript received July 5, 2015; published online September 3, 2015. Assoc. Editor: Mark Anderson.
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Murase, M., Kinoshita, I., Kusunoki, T., Lucas, D., and Tomiyama, A. (September 3, 2015). "Countercurrent Flow Limitation in Slightly Inclined Pipes With Elbows." ASME. ASME J of Nuclear Rad Sci. October 2015; 1(4): 041009. https://doi.org/10.1115/1.4031032
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