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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