Thermo-hydraulic instability of boiling natural circulation loop induced by flashing (analytical consideration)

F. Inada*, M. Furuya, A. Yasuo


研究成果: Conference article査読

65 被引用数 (Scopus)


An analytical study is presented on the thermo-hydraulic stability of a boiling natural circulation loop with a chimney at low pressure start-up. The effect of flashing induced by the pressure drop in the channel and the chimney due to gravity head on the instability is considered. A method to analyze linear stability is developed, in which a drift-flux model is used. The analytical result of a stability map agrees very well with the experimental one obtained in a previous report. Instability does not occur when the heater power is too low to generate voids in the chimney and only natural circulation of single phase can be induced. Instability tends to occur when boiling occurs only near the chimney exit due to flashing. This instability phenomenon has some similarities with density wave oscillation, such as the phase difference of temperature between the boiling region and non-boiling region, and the oscillation period which is near to the time required for fluid to pass through the chimney. However, there are also some differences from density wave oscillation, such as the boiling region is very short, and pressure fluctuation can affect void fraction fluctuation.

ジャーナルNuclear Engineering and Design
出版ステータスPublished - 2000 8月
イベントNURETH-8: 8th International Meeting on 'Nuclear Reactor Thermal Hydraulics' - Kyoto, Jpn
継続期間: 1997 9月 301997 10月 4

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学
  • 原子力エネルギーおよび原子力工学
  • 材料科学(全般)
  • 安全性、リスク、信頼性、品質管理
  • 廃棄物管理と処理
  • 機械工学


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