采用压差法和电阻探针测定了空气?水混合体系的气含率，用扭矩仪测量扭矩和转速，计算输入功率. 将气体分成进出停留气体A和内循环气体B两部分，建立宏观气含率的物理模型. 结果表明，针对不同气液混合流型，将宏观气含率分成两个阶段是合理的，?total??Vs?适用于气泛状态，?total??Vs?+?PV?Vs?适用于载气和气体完全分散状态，对于DT+DT组合桨??6, ??1, ??0.32, ??0.56, ??1. 模型对文献数据的预测较合理，且具有一定的适应性，?取决于搅拌桨类型.

The gas holdup in an air?water systems is measured using the method of differential pressure and the electric conductive probes. N and M are measured by the torque transducer and used to calculate the power input. A physical model was developed to predict the total gas holdup in a gas?liquid stirred vessel by dividing the gas in the liquid into two parts that A is the one entering and quitting the liquid, and B is the other recycling in the liquid, respectively, The results indicate that based on the difference between flow regimes in gas?liquid systems, it is reasonable that the total gas holdup should divided into two stages: ?total??Vs? for the flooding condition, ?total??Vs?+?PV?Vs? for the loading/completely dispersing conditions, and as for DT+DT, ??6, ??1, ??0.32, ??0.56, ??1. The results from literatures are predicted by the model reasonably. The model is reasoned for some other types of dual-impellers, in which ? is controlled by the types of the impellers.