Abstract
This study analytically investigated the subcooling effect of injected water on falling water limitation in countercurrent two-phase flow (CCFL) in vertical channels, by applying a new model of momentum balances for both liquid and gas phases to the entire length of the channel. The subcooling effect of injected water on CCFL, which is one of the dominant parameters, had been clarified neither analytically nor experimentally because the CCFL phenomena is so complicated thermodynamically. As a result of the present study, it was clarified that the analytical model proposed here could give good predictions of the existing data on the subcooling effect of experiments simulating the performance of emergency core cooling water injection during a loss-of-coolant accident in pressurized light-water reactors.
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