[2B14-17] CCFL and Liquid Film Behavior

[2B15] Effect of Diameters on Countercurrent Flow Limitation at Sharp-Edged Upper End of Vertical Pipes

*Michio Murase¹, Koji Nishida¹, Takayoshi Kusunoki¹, Akio Tomiyama² (1. Institute of Nuclear Safety System, Inc., 2. Kobe University)

Keywords:pressurizer surge line, upper end of vertical pipe, countercurrent flow limitation, diameter

The effect of the diameters on countercurrent flow limitation (CCFL) at the sharp-edged upper end of vertical pipes was evaluated in detail using existing CCFL data, a clear difference of the diameter effect between different experiments was found in the region of diameters less than 30 mm.