Abstract
The final goal of this study is to clarify the mechanism behind enhancements of wall surface wettability and boiling heat transfer due to the radiation induced surface activation (RISA) under high-temperature and high-pressure conditions equivalent to thermal environment in a core of light water reactor. Detailed discussions about dynamic wettability at ambient temperatures up to 250 degrees centigrade were made based on the experimental data. The results showed that the advancing contact angles were decreased due to gamma-ray irradiation at all conditions tested and revealed that the dynamic wettability was enhanced due to the RISA even under high-temperature and high-pressure conditions.
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