To investigate the heat transfer characteristics of chrome-plated tube and whether it have the potential to improve the heat transfer coefficient of Passive Containment heat removal System (PCS) of an advanced nuclear power plant, an experimental investigation has been conducted. In this experiment, a series of steam condensation experiments are performed under pure steam and steam-air mixed conditions over chrome-plated tube for a variety of chrome coating thickness(1μm and 10μm), total pressure, air mass fraction and wall subcooling degree. Condensation heat transfer coefficient were obtained for the total pressure ranging from 0.2MPa to 0.4MPa, air mass fraction ranging from 0.10 to 0.91, and wall subcooling degree from 10℃ to 80℃. Moreover, the designed visualization experimental device makes the experimental phenomenon can be directly observed through the observation window. Under the pure steam condition the results show that droplet condensation and filmwise condensation is co-existed on both two kinds of chrome plated tubes, the chrome coating thickness of 10 μm tube shows better heat transfer ability. Under the steam-air mixed condition, the condensation heat transfer of both two kinds of tubes increase with total pressure, and decrease with the air mass fraction and wall subcooling degree, while the influence of chrome coating thickness on heat transfer is no longer obvious. The results also indicate that the thickness of chrome coating will affect the surface microstructure of chrome-plated tube, and then affect the heat transfer ability of chrome-plated tube.


Experimental Study of Pure Steam and Steam-Air Mixture Condensation on a Vertical Chrome-Plated Tube

Division / Sponsors: 
Power Division & Nuclear Engineering Division (NED)

Power Conference
Paper Proceedings: https://asmedigitalcollection.asme.org/POWER/POWER2020/volume/83747

International Conference on Nuclear Engineering
Paper Proceedings: https://asmedigitalcollection.asme.org/ICONE/ICONE2020/volume/83761

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