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

58 引用 (Scopus)

抜粋

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.

元の言語English
ページ(範囲)187-199
ページ数13
ジャーナルNuclear Engineering and Design
200
発行部数1
DOI
出版物ステータスPublished - 2000 8
外部発表Yes
イベントNURETH-8: 8th International Meeting on 'Nuclear Reactor Thermal Hydraulics' - Kyoto, Jpn
継続期間: 1997 9 301997 10 4

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Safety, Risk, Reliability and Quality
  • Waste Management and Disposal
  • Mechanical Engineering

フィンガープリント Thermo-hydraulic instability of boiling natural circulation loop induced by flashing (analytical consideration)' の研究トピックを掘り下げます。これらはともに一意のフィンガープリントを構成します。

  • これを引用