Abstract
In the previous study, we have evaluated countercurrent flow limitation (CCFL) at the sharp-edged upper end of the vertical pipe in the pressurizer surge line of a pressurized water reactor, and derived CCFL correlation by using air-water CCFL data with the diameter range of D = 19-140 mm. However, steam-water data are limited, and effects of fluid properties on CCFL are not clear. Recently we found steam-water data by Ilyukhin et al. (1988) with the diameter of 20 mm and pressures of P = 0.6- 4.1 MPa. By using these data and air-water data at 0.1 MPa, we evaluated effects of fluid properties on CCFL, and found that the viscosity ratio of gas and liquid is better than the density ration of gas and liquid (which was used by Ilyukhin et al.) to modify the Kutateladze parameters in the CCFL correlation proposed by Wallis.
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