Study to clarify mechanism behind heat transfer enhancement in reactor due to RISA

研究阐明RISA增强反应器传热背后的机制

• 批准号: 23360425
• 负责人: HAZUKU Tatsuya
• 金额: $ 11.65万
• 依托单位: Tokyo University of Marine Science and Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23360425/
• 关键词: 放射線誘起表面活性; 濡れ性; 沸騰伝熱; 伝熱向上; 軽水炉; ドライアウト; 放射線誘起表面活性; 濡れ性; 沸騰伝熱; 伝熱向上; 軽水炉; ドライアウト

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.In order to evaluate the effect of surface wettability on liquid film dryout in annular-mist flow, the flow characteristics of liquid film and droplets near the condition in which the liquid film dryout occurs were also observed in detail using two-test pipes with different surface wettability.

这项研究的最终目标是阐明在高温和高压条件下，由于辐射诱导的表面激活（RISA）而引起的壁表面润湿性和沸腾传热的机制，等同于轻水反应堆核心的热环境。 根据实验数据进行了关于周围温度下250度的环境温度下动态润湿性的详细讨论。 结果表明，在所有测试的条件下γ射线照射而降低了进步的接触角，并表明由于Risa即使在高温和高压条件下，动态性润湿性也得到了增强表面润湿性不同的管道。