Gas-liquid turbulent flow in a side-entering stirred tank with φ1.5 m×1.2 m was simulated with computational fluid dynamics (CFD).Three interface boundary conditions (pressure-outlet

velocity-inlet and degassing boundary)and two drag force models(standard S-N model and Brucato-Tsuchiya model)were presented and respectively coupled with the Euler-Euler model and dispersed two-phase k-ε turbulence model by using user define function (UDF).The impeller power number

total gas holdup and gas phase distribution in the tank were calculated and compared with the measurements of the cold model experiments to investigate the effect of boundary condition of gas-liquid interface and drag force model on prediction accuracy.The results indicated that the predicted results calculated with the CFD model coupled with the Brucato-Tsuchiya model and adopting the velocity-inlet or degassing boundary condition

were in agreement with the experimental results

much better than the pressure-outlet boundary condition.