定量描述非理想流动情况的模型，主要用于装置的设计和放大。
提出了一个流动模型及设计方法。
讨论了挤压流动模型、凹模优化设计原理。
The flow model of extrusion and optimal principles of die design are discussed.
分析假设球内空气的行为符合压缩、粘性流体流动模型。
The air outside the ball was ignored, and it was assumed that the air inside the ball behaved according to a compressive, viscous fluid-flow model.
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