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。
2
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。
3
The disk, which is composed of continuous annuluses, can expand equivalent trangle by asymptotice line. We can obtain the circular area which is visually expressed by circumference and radius.