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液体的恒定流连续性方程是物质质量守恒原理在液体恒定流动中的具体表现,现采用一元流动分析法讨论如下 PowerPoint PPT Presentation


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第七讲. 第三节 恒定流连续性方程. 液体的恒定流连续性方程是物质质量守恒原理在液体恒定流动中的具体表现,现采用一元流动分析法讨论如下. 在恒定总流中任取一元流流段,如图. 设进出口断面面积分别为 dA 1 和 dA 2 ,相应的流速分别为 u 1 和. u 2 , 因为液体一般可视密度  为常数; 恒定流中,元流的形状和位置不随时间而改变;在元流的侧壁上不会有液体的流入和流出。. 所以,根据质量守恒原理,在 dt 时段内,流入 dA 1 和流出 dA 2 的质量应相等,即. 化简得. 或. 上式为恒定元流的连续性方程。将其对相应的总流过水断面积分. 即. 或.

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液体的恒定流连续性方程是物质质量守恒原理在液体恒定流动中的具体表现,现采用一元流动分析法讨论如下

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