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ナトリウム-水反応における伝熱管表面熱伝達率とボイド率相関に関する考察

Study on correlation of heat transfer coefficient with void fraction on heat transfer tube surface in sodium-water reaction

松本 俊慶*; 高田 孝*; 山口 彰*; 栗原 成計 ; 大島 宏之

Matsumoto, Toshinori*; Takata, Takashi*; Yamaguchi, Akira*; Kurihara, Akikazu; Ohshima, Hiroyuki

高速炉蒸気発生器でのナトリウム-水反応領域にある伝熱管の高温ラプチャ評価には流体-伝熱管の熱移行量評価が必要となる。管表面における熱伝達率は、伝熱管周囲の流体速度,ボイド率等により決まる。本報告では、ナトリウム-水反応中の伝熱管近傍の流動様式を定量評価することを目的として、反応領域における熱伝達率-ボイド率相関図の構築を行うとともに、相関図を用いたナトリウム-水反応時のボイド率履歴を評価した。

When a heat transfer tube fails in steam generator (SG) of sodium-cooled fast reactor (SFR), sodium-water reaction (SWR) would take place. It is significant for estimation of the heat transfer from the fluid to the tube wall during SWR region to evaluate the possibility of the secondary tube failure in case of overheating rupture. In the present study, thermal hydraulics simulation of the fluid around the tube is conducted. The heat transfer coefficient is computed, the correlation diagram between the heat transfer coefficient and the void fraction has been obtained. The void fraction around the heat transfer tube in the SWR has been evaluated.

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