Flashing-induced density wave oscillations in a boiling natural circulation system

Masahiro Furuya*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapter


This chapter addresses characteristics of flashing-induced density wave oscillations on the basis of the experimental results in a boiling natural circulation system with an adiabatic chimney. Flashing is caused by the sudden increase of vapor generation due to the reduction in hydrostatic head, since saturation enthalpy changes with pressure. Flashing-induced density wave oscillations may, therefore, occur at low pressure. The oscillation period correlates well with the passing time of bubbles in the chimney section regardless of the system pressure, the heat flux, and the inlet subcooling. According to the stability map, the flow became stable below a certain heat flux regardless of the channel inlet subcooling. The stable region enlarged with increasing system pressure. Therefore, the stability margin becomes larger by pressurizing the loop sufficiently before heating.

Original languageEnglish
Title of host publicationAdvances in Multiphase Flow and Heat Transfer
PublisherBentham Science Publishers B.V.
Number of pages20
Publication statusPublished - 2018
Externally publishedYes

Publication series

NameAdvances in Multiphase Flow and Heat Transfer
ISSN (Electronic)1879-4467


  • BWR
  • Boiling two-phase flow
  • Flashing
  • Natural circulation
  • Stability

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes


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