随管束排数的增加，阻力系数迅速下降，当管束排数大于8后，则不再有明显变化。
Besides, they decrease rapidly with the increase of tube bundle rows. When the row number amount to 8 or more, the resistance coefficient does not change any more.
对单根试验管、叉排管束、矩形截面超片管和三角形截面翅片管的试验结果进行了综合比较。
The experimental results are collected and compared on single experimental pipe, cross tube bundle, rectangle and triangle cross fin-tube.
立式圆筒形储罐用的排管式加热器，在分配管与管束连接处经常发生损坏。
The arranged pipe heater of vertical cylindrical storage oil tank often occurred damage at the joint zone between the distributor pipe and bundle.
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