laminar flow 又称层流。流体的一种流动类型。流体质点的运动迹线有条不紊的流动。圆管中流体的雷诺数小于2300时，呈滞流现象。如果大于此值则为过渡流或湍流。
由于压力差引起的气体或液体流称为滞流。
Flow of gas or liquid due to a pressure difference is called viscous flow.
研究表明，在常用的工业条件下，过程为典型的流体滞流膜扩散控制。
The results indicated that under normal industrial conditions, the process is controlled by diffusion of fluid stagnant film.
这些措施显著降低了壳程阻力和滞流区，壳程的气体接管方位可任意选定。
These measures significantly reduce the resistance and laminar flow zone in the shell side. The gas pipe connection orientation on the shell side can be freely selected.
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