Rifled or other pipe wall corrugation may change the flow from a hetero-generous to a homogeneous regime by introducing a secondary circulation.
在有来复线的或其它的管壁皱纹的管中，由于引起副流，可能将非均质流转变为均质流。
Now lets place some secondary shapes, rings around the pipe.
现在放些二级形，环绕管子的圆环。
The inner stresses of the tubes and pipe arrangement stresses are the secondary cause, which accelerated the explosion procedure.
管子内压应力与管系应力加速了爆漏过程，是造成过热器管撕裂爆口的次要原因。
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