给定瞬时，在涡量场中，过任意封闭围线（不是涡线）上各点，做涡线所形成的管状表面，称为涡管。
流向涡管存在拉伸和变形。
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.
发现沿切变线走向有一条中尺度涡管，位于对流层中低层，高度呈波状起伏。
The results showed that there was a mesoscale vortex tube along the mesoscale shear line on the middle low troposphere, and its altitude varied in a wave shape.
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