Down flow of water-air mixtures in vertical columns

Published data and data obtained by the present authors on gas-liquid (water-air) down flows are examined. Down flows are investigated for the conditions of the cooling loop of the RBMK control-and-protection system and the system ejecting gas in the safety-and-control system channels with film cooling. A criterial analysis is performed of the main parameters characterizing down flows in regimes of companion motion of the phases and hovering of the gas phase.