Abstract
To evaluate effects of wall friction coefficients in a one-dimensional model on prediction of countercurrent flow limitation (CCFL), sensitivity computations were done for hot leg models (ratio of length to diameter, L/D = 8.6) and a pressurizer surge line model without elbows (L/D) = 63) and computed results were compared with measured values. When the interfacial drag coefficient of fi = 0.03 and wall friction coefficients fw_G of single-phase gas flows were used, the appropriate amplification (i.e. adjustment factor) for wall friction coefficients fw_L of single-phase liquid flows was Nw_L = 6; this gave good fit of the computed CCFL values with the measured CCFL values.
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