For co-rotation and counter-rotation in which the centrifugal force dominates the flow, the secondary flow in a rotating helical pipe has the same direction with that in a stationary one.
对于正旋转和离心力占优的负旋转，二次流速度的方向和静止的情况相同；
For co-rotation and counter-rotation in which the centrifugal force dominates the flow, the secondary flow in a rotating helical pipe has the same direction with that in a stationary one.
对于正旋转和离心力占优的负旋转，二次流速度的方向和静止的情况相同；
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