Abstract
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 language | English |
|---|---|
| Title of host publication | Advances in Multiphase Flow and Heat Transfer |
| Publisher | Bentham Science Publishers B.V. |
| Pages | 280-299 |
| Number of pages | 20 |
| DOIs | |
| Publication status | Published - 2018 Jan 1 |
| Externally published | Yes |
Publication series
| Name | Advances in Multiphase Flow and Heat Transfer |
|---|---|
| Volume | 3 |
| ISSN (Electronic) | 1879-4467 |
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Keywords
- Boiling two-phase flow
- BWR
- Flashing
- Natural circulation
- Stability
ASJC Scopus subject areas
- Fluid Flow and Transfer Processes
Cite this
Flashing-induced density wave oscillations in a boiling natural circulation system. / Furuya, Masahiro.
Advances in Multiphase Flow and Heat Transfer. Bentham Science Publishers B.V., 2018. p. 280-299 (Advances in Multiphase Flow and Heat Transfer; Vol. 3).Research output: Chapter in Book/Report/Conference proceeding › Chapter
}
TY - CHAP
T1 - Flashing-induced density wave oscillations in a boiling natural circulation system
AU - Furuya, Masahiro
PY - 2018/1/1
Y1 - 2018/1/1
N2 - 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.
AB - 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.
KW - Boiling two-phase flow
KW - BWR
KW - Flashing
KW - Natural circulation
KW - Stability
UR - http://www.scopus.com/inward/record.url?scp=85054034309&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85054034309&partnerID=8YFLogxK
U2 - 10.2174/978160805228811203010280
DO - 10.2174/978160805228811203010280
M3 - Chapter
AN - SCOPUS:85054034309
T3 - Advances in Multiphase Flow and Heat Transfer
SP - 280
EP - 299
BT - Advances in Multiphase Flow and Heat Transfer
PB - Bentham Science Publishers B.V.
ER -