Effect of liquid density differences on boiling two-phase flow stability

Masahiro Furuya*, Annalisa Manera, David D.B.Van Bragt, Tim H.J.J.Van Der Hagen, Willy J.M.De Kruijf

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


In order to investigate the effect of considering liquid density dependence on local fluid temperature in the thermal-hydraulic stability, a linear stability analysis is performed for a boiling natural circulation loop with an adiabatic riser. Type-I and Type-II instabilities were to investigate according to Fukuda-Kobori's classification. Type-I instability is dominant when the flow quality is low, while Type-II instability is relevant at high flow quality. Type-II instability is well known as the typical density wave oscillation. Neglecting liquid density differences yields estimates of Type-II instability margins that are too small, due to both a change in system-dynamics features and in the operational point. On the other hand, neglecting liquid density differences yields estimates of Type-I stability margins that are too large, especially due to a change in the operational point. Neglecting density differences is thus non-conservative in this case. Therefore, it is highly recommended to include liquid density dependence on the fluid subcooling in the stability analysis if a flow loop with an adiabatic riser is operated under the condition of low flow quality.

Original languageEnglish
Pages (from-to)1094-1098
Number of pages5
JournalJournal of Nuclear Science and Technology
Issue number10
Publication statusPublished - 2002 Oct
Externally publishedYes


  • BWR type reactors
  • Boiling two-phase flow
  • Density wave oscillations
  • Linear stability analysis
  • Natural circulation
  • Riser
  • Thermal-hydraulics

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering


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