annuli

The flowing state in narrow annuli changes apparently quicker than that in circular tube.

窄环隙流道内流态由层流向紊流转变明显提前.

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The velocity profile should be confirmed when non - Newtonian fluid flowing in duct and annuli is researched.

在研究 非 牛顿流体圆管和环空管流层流流动问题时,确定其速度分布是关键.

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