This study reports an experimental investigation on hydrodynamics and mass transfer characteristics in a 15.6x10-3 m3 external loop airlift reactor for oil-in-water micro-emulsions with oil to water volume ratio （φ...This study reports an experimental investigation on hydrodynamics and mass transfer characteristics in a 15.6x10-3 m3 external loop airlift reactor for oil-in-water micro-emulsions with oil to water volume ratio （φ） rang- ing from 3% to 7% （by volume）. For comparative purposes, experiments were also carried out with water. Increase in φ of micro-emulsion systems results in an increment in the gas holdup and a decrease in the volumetric gas-liquid oxygen transfer coefficient and liquid circulation velocity, attributed to the escalation in the viscosity of mi- cro-emulsions. The gas holdup and volumetric mass transfer coefficient for micro-emulsion systems are signifi- cantly higher than that of water system. Two correlations are developed to predict the gas holdup and oxygen trans- fer coefficient展开更多
The disturbance, caused by the boiling Phenomena in the inverted meniscus ac evaporator, is of great importancein the normal operation of the CPL, especially When the heat load is low. By theoretical and experimental ...The disturbance, caused by the boiling Phenomena in the inverted meniscus ac evaporator, is of great importancein the normal operation of the CPL, especially When the heat load is low. By theoretical and experimental studies onthis issue, it shows that the evaporator of the CPL operates in a mode of boiling in the Wick. By solving a set ofmomentum equations, it concludes that, this kind of boiling Phenomena in the wick cause no notable negativeinfluence on the normal peiformance of the CPL, although there really edests some adVerse influence during theCPL start-up. Addihonally, the causes of the dry-out of the evaporator under low heat load are conducted in thepaper. The conclusions are verified by subsequent experiments. More details about the experiments are alsodescribed in the paper.展开更多
文摘This study reports an experimental investigation on hydrodynamics and mass transfer characteristics in a 15.6x10-3 m3 external loop airlift reactor for oil-in-water micro-emulsions with oil to water volume ratio （φ） rang- ing from 3% to 7% （by volume）. For comparative purposes, experiments were also carried out with water. Increase in φ of micro-emulsion systems results in an increment in the gas holdup and a decrease in the volumetric gas-liquid oxygen transfer coefficient and liquid circulation velocity, attributed to the escalation in the viscosity of mi- cro-emulsions. The gas holdup and volumetric mass transfer coefficient for micro-emulsion systems are signifi- cantly higher than that of water system. Two correlations are developed to predict the gas holdup and oxygen trans- fer coefficient
文摘The disturbance, caused by the boiling Phenomena in the inverted meniscus ac evaporator, is of great importancein the normal operation of the CPL, especially When the heat load is low. By theoretical and experimental studies onthis issue, it shows that the evaporator of the CPL operates in a mode of boiling in the Wick. By solving a set ofmomentum equations, it concludes that, this kind of boiling Phenomena in the wick cause no notable negativeinfluence on the normal peiformance of the CPL, although there really edests some adVerse influence during theCPL start-up. Addihonally, the causes of the dry-out of the evaporator under low heat load are conducted in thepaper. The conclusions are verified by subsequent experiments. More details about the experiments are alsodescribed in the paper.
