立管冷凝强化传热研究的进展

立管冷凝强化传热技术是利用Gregorig效应在凹槽的顶端产生薄膜冷凝，并通过凹槽有效地排液，从而达到强化膜状冷凝换热的目的。为此，对波形曲面凹槽管、垂直余弦形沟槽管、V形纵槽管、垂直光管设置纵向金属丝、立式螺旋槽管和小螺旋角的内外螺旋三角翅片管在强化冷凝热方面研究的进展作了概述，并介绍了制备低表面能合金材料以实现稳定滴状冷凝的冷凝换热强化新技术。最后指出，立管冷凝强化传热技术在电站的立式加热器中应用，可以较大幅度地提高给水温度，实现节能增效。

Research advance in enhanced condensation heat transfer on vertical tubes

The enhanced condensation heat transfer technology on vertical tubes makes use of Gregorig effect to result in film condensation at the top of a groove, and effectively displace liquid through the groove, thus realizing the enhancement of film condensation heat transfer. This paper describes the research advance in enhanced condensation heat transfer on the wave shape bend surface fluted tube, vertical cosine grooved tube, V shape longitudinal grooved tube, vertical plain tube with longitudinal wire, vertical spirally fluted tube and the inside and outer triangle finned tube with small spiral angles (IOSF tube). In addition, the paper also introduces the new enhanced condensation heat transfer technique of preparing low surface energy alloy to realize stable guttate condensation. It is indicated that the enhanced condensation heat transfer technology on vertical tubes, when applied to vertical utility heaters, can efficiently raise the feed water temperature and save energy.