What's happening here is a stable "sustaining" phase in a product's lifecycle, managed in a waterfall state transition model with a flow.
这里表现的是产品生命周期里稳定的“持续(sustaining)”阶段，处在带有流程的瀑布状态转换模型的管理之下。
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。
The author has applied the modified transition model into the practical flow field calculation, compared the calculation results and obtained some significant analysis results.
作者将修正的转捩模型应用到实际流场计算中，对计算结果进行了比较，从中得到了一些有意义的分析结果。
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