本文分析了降液膜高雷诺数区域换热系数随液膜长度变化趋势，引出临界长度的概念。
A critical length concept is introduced to describe the heat transfer performance of thin film flows with high Reynolds number in this investigation.
内引出棒和外引出棒一端的端面上开有小孔，分别与热熔断器两端的引出线铆接。
The end face at one end of the inner lead-out rod and the outer lead-out rod is provided with small holes that are riveted with the lead-out wires at two ends of the thermal fuse.
内引出棒和外引出棒一端的端面上开有小孔，分别与热熔断器两端的引出线铆接。
The end face at one end of the inner lead-out rod and the outer lead-out rod is provided with small holes that are riveted with the lead-out wires at two ends of the thermal fuse.
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