A more detailed multi fluid model was developed with the gas phase divided into several groups according to bubble size to describe bubbly flow in a vertical pipe.

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。

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It is based on the physical model of exhausted gas bubble and numerically simulates the entire flow field by coupling calculation of the water field and gas field.

计算采用燃气泡物理模型，通过水流场和气流场的耦合计算模拟整个流场的形态。

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When the second derivative of the bubble number in unit bed volume with respect to gas velocity equals zero, the flow regime transition occurs. The model fits fairly well with the experimental data.

导出了当单位床层体积中气泡数目对气速的二阶导数为零时发生流型转变，该模型的计算机结果与实验数据吻合良好。

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