冷却管的使用寿命非常短，消耗量相当大。
Since its life is especially short, the consumption of cooling pipe is very high.
温差越大，无保温管与有保温管伸长量之差越大，则保温层摩擦力越大；
The more pipe have temperature difference, the more pipe elongation and insulation friction.
根据涡管定义，穿过涡管管壁的涡量为零。
The flux through the wall of the vortex tube is zero by its definition.
根据涡管定义，穿过涡管管壁的涡量为零。
The flux through the wall of the vortex tube is zero by its definition.
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