Flow Regime Transition Criteria for Vertical Downward Two-Phase Flow in Rectangular Channel
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Narrow rectangular channels are employed in nuclear research reactors that use plate-type nuclear fuels,high heat-flux compact heat exchangers, and high-performance micro-electronics cooling systems. Twophase flow in narrow rectangular channels is important, and it needs to be better understood because itis considerably different than that in round tubes. In this study, mechanistic models were developed forthe flow regime transition criteria for various flow regimes in co-current air-water two-phase flow forvertical downward flow inside a narrow rectangular channel. The newly developed criteria werecompared to a flow regime map of downward air-water two-phase flow inside a narrow rectangularchannel with a 2.35-mm gap width under ambient temperature and pressure conditions. Overall, theproposed model showed good agreement with the experimental dat
Abstract
Narrow rectangular channels are employed in nuclear research reactors that use plate-type nuclear fuels,high heat-flux compact heat exchangers, and high-performance micro-electronics cooling systems. Twophase flow in narrow rectangular channels is important, and it needs to be better understood because itis considerably different than that in round tubes. In this study, mechanistic models were developed forthe flow regime transition criteria for various flow regimes in co-current air-water two-phase flow forvertical downward flow inside a narrow rectangular channel. The newly developed criteria werecompared to a flow regime map of downward air-water two-phase flow inside a narrow rectangularchannel with a 2.35-mm gap width under ambient temperature and pressure conditions. Overall, theproposed model showed good agreement with the experimental dat
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