常用的描述泡状流运动的双流体模型采用一个平均尺寸对气相进行描述。不同尺寸气泡的运动和受力不同。当气泡尺寸分布范围较大时 ,不宜采用双流体模型描述泡状流。根据气泡的尺寸划分气相 ,采用时间平均法建立了描述垂直管道内层流泡状流运动的多流体模型。通过对气泡在流场中的运动和受力分析 ,给出了用以封闭模型的粘性应力、脉动应力、相间动量交换项的表达式。利用模型对具体实验进行了预测 ,模型预测值与实验值的比较结果表明采用多流体模型能够预测气泡尺寸范围较大的泡状流 A commonly used two-fluid model describing bubbly flow motion describes the gas phase with an average size. Bubbles of different sizes have different motions and forces. When the bubble size distribution is large, it is not advisable to use a two-fluid model to describe bubble flow. The gas phase is divided according to the size of the bubble. A time-averaged method is used to establish a multi-fluid model that describes the bubbly flow in the vertical pipe. Through the analysis of the movement and the force of the bubble in the flow field, the expression of viscous stress, pulsating stress and interphase momentum exchange used to close the model is given. The model was used to predict the specific experiment. The results of the model prediction and the experimental results show that the multi-fluid model can predict the bubble flow with a large bubble size