Abstract
The falling liquid flow rate under flooding conditions is limited at a square top end of a vertical pipe in the pressurizer surge line that consists of a vertical pipe, a vertical elbow and a slightly inclined pipe with elbows. Therefore, we evaluated effects of fluid properties on countercurrent flow limitation (CCFL) at the square top end in vertical pipes (CCFL-U) and we derived a Wallis-type correlation for CCFL in pressurizer surge line models (CCFL-SL) by using existing data. The density ratio ρG/ρL was better than the viscosity ratio μG/μL for evaluating CCFL-U as a secondary factor affecting CCFL. We found that there was a strong relationship between the constant CK and the slope m in the Wallis-type correlation with the Kutateladze parameters, and the relationship was useful to identify features of CCFL-U and CCFL-SL. CCFL-SL could be expressed by the Kutateladze parameters with CK = 1.20 ± 0.20 and m = 0.79 for D = 30–90 mm.
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