N the area between two concentric circles 环面
The test section was composed of transparent vertical annuluses. The shape and size of electric heating rods were similar to nuclear fuel rods.
试验本体采用了透明的垂直环形通道，电加热元件的尺寸及形状与核燃料元件相同。
Performance of fluid can be improved remarkably by adding diversion annuluses within the tube segments where the cross section suddenly changes.
通过在各截面突变处设置管口导流环会有很好的降阻效果。
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