A mathematical model for predicting tray efficiency of a new vertical sieve tray tower was proposed

considering the characteristics of the gas-liquid cocurrent up-flow in the caps and the liquid mixing between the caps on the tray. The behavior of the tray was represented by a model of dual cell

a mass transfer cell and a liquid mixing cell. The numerical results were summarized in graphs relating the Murphree tray efficiency to the point efficiency

the stripping factor

the degree of liquid circulation and the row number of the caps.The liquid circulation rate was measured in an air-water simulator. Tray absorption efficiency and point efficiency were determined with an air-ammonia-water system in the same simulator.The tray efficiencies calculated from the mathematical model using tha correlations for the liquid circulation rate and the point efficiency were consistent with the experimental results.