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

Research output: Chapter in Book/Report/Conference proceedingChapter

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 languageEnglish
Title of host publicationAdvances in Multiphase Flow and Heat Transfer
PublisherBentham Science Publishers B.V.
Pages280-299
Number of pages20
DOIs
Publication statusPublished - 2018 Jan 1
Externally publishedYes

Publication series

NameAdvances in Multiphase Flow and Heat Transfer
Volume3
ISSN (Electronic)1879-4467

Fingerprint

Boiling liquids
Chimneys
Heat flux
Pressurization
Enthalpy
Vapors
Heating

Keywords

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

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

Cite this

Furuya, M. (2018). Flashing-induced density wave oscillations in a boiling natural circulation system. In Advances in Multiphase Flow and Heat Transfer (pp. 280-299). (Advances in Multiphase Flow and Heat Transfer; Vol. 3). Bentham Science Publishers B.V.. https://doi.org/10.2174/978160805228811203010280

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 proceedingChapter

Furuya, M 2018, Flashing-induced density wave oscillations in a boiling natural circulation system. in Advances in Multiphase Flow and Heat Transfer. Advances in Multiphase Flow and Heat Transfer, vol. 3, Bentham Science Publishers B.V., pp. 280-299. https://doi.org/10.2174/978160805228811203010280
Furuya M. Flashing-induced density wave oscillations in a boiling natural circulation system. In Advances in Multiphase Flow and Heat Transfer. Bentham Science Publishers B.V. 2018. p. 280-299. (Advances in Multiphase Flow and Heat Transfer). https://doi.org/10.2174/978160805228811203010280
Furuya, Masahiro. / Flashing-induced density wave oscillations in a boiling natural circulation system. Advances in Multiphase Flow and Heat Transfer. Bentham Science Publishers B.V., 2018. pp. 280-299 (Advances in Multiphase Flow and Heat Transfer).
@inbook{fc9e77a2c8604ee2870bf6f0481197f7,
title = "Flashing-induced density wave oscillations in a boiling natural circulation system",
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.",
keywords = "Boiling two-phase flow, BWR, Flashing, Natural circulation, Stability",
author = "Masahiro Furuya",
year = "2018",
month = "1",
day = "1",
doi = "10.2174/978160805228811203010280",
language = "English",
series = "Advances in Multiphase Flow and Heat Transfer",
publisher = "Bentham Science Publishers B.V.",
pages = "280--299",
booktitle = "Advances in Multiphase Flow and Heat Transfer",
address = "Netherlands",

}

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 -