In this article, a series of steam condensation experiments were performed on the outer surface of chrome-plated tube and polished tube under steam and steam–air mixed conditions to study their heat transfer characteristics and whether they could be used to optimize Passive Containment Cooling System in advanced nuclear reactors. The effects of total pressure, air mass fraction and subcooling on condensation heat transfer of the chrome-plated tube and polished tube were analyzed. Moreover, basing on the existing experiment, a smooth tube that has the same size as the polished tube and chrome-plated tube was tested under the same conditions. The experimental phenomena indicated that filmwise condensation and dropwise condensation co-exist on the tube exterior surface, and more droplets were observed on the exterior surface of the chrome-plated tube. Under the steam condition, with the fixed wall subcooling, condensation heat transfer coefficient of the polished tube and chrome-plated tube shows different change rules under different pressure: the condensation heat transfer coefficient of the polished tube increases with the increase of pressure, while the chrome-plated tube decreases with the increase of pressure. Compared with the smooth tube, the heat transfer performance can be improved by using the chrome-plated tube and polished tube. Under the steam–air condition, the existence of air deteriorates heat transfer performance seriously. The heat transfer performance of the chrome-plated tube and the polished tube are both improved compared with the smooth tube when the air mass fraction is below 60℃. When the air mass fraction is over 60℃, the heat transfer ability of these tubes are similar to the smooth tube. Besides, within the measurement parameters of our experiment, the increase in total pressure has a positive effect on steam condensation with air.

在本文中，在蒸汽和蒸汽-空气混合条件下，对镀铬管和抛光管的外表面进行了一系列蒸汽冷凝实验，以研究它们的传热特性以及它们是否可用于优化被动安全壳冷却系统在先进的核反应堆中 分析了总压力，空气质量分数和过冷度对镀铬管和抛光管冷凝水传热的影响。此外，根据现有实验，在相同条件下测试了与抛光管和镀铬管尺寸相同的光滑管。实验现象表明，在管的外表面上同时存在膜状冷凝和滴状冷凝，并且在镀铬管的外表面上观察到更多的液滴。在蒸汽条件下，采用固定壁过冷时，抛光管和镀铬管的冷凝传热系数在不同压力下表现出不同的变化规律：抛光管的冷凝传热系数随压力的增加而增大，而压力越大，冷凝管的冷凝传热系数越大。镀铬管随着压力的增加而减小。与光滑管相比，通过使用镀铬管和抛光管可以提高传热性能。在蒸汽-空气条件下，空气的存在会严重降低传热性能。当空气质量分数低于60℃时，与光滑管相比，镀铬管和抛光管的传热性能均得到改善。当空气质量分数超过60℃时，这些管子的传热能力类似于光滑管子。此外，在我们实验的测量参数范围内，总压力的增加对蒸汽与空气的凝结有积极作用。