n.环带物(环形套筒；圆；圈)

The geometric models of eccentric annuli flow field were established in the computational fluid dynamics PHOENICS-VR. 摘要在流体计算软件PHOENICS的VR编辑环境中，建立了偏心环空流场几何模型。

More accurate calculation of pressure loss in narrow annuli of slim holes and coiled tubing operations is required. 在小眼井和连续油管作业的窄环空中，要求更加准确地计算摩擦压降。

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

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。

In addition, the decrease of the annuli gap will yield heat transfer deterioration during flowing in narrow annular channels. 此外，环缝间隙的减小将导致环形通道的换热性能下降。