Thermohydraulic instability of boiling natural circulation loop with a chimeny. 1st report, linear stability analysis using homogenous two-phase flow model and experiment on thermohydraulic instability induced by flashing

Fumio Inada, Masahiro Furuya, Akira Yasuo

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Instability of a boiling natural circulation loop with a chimney at low pressure and low heater power was investigated by linear stability analysis and experiment. A homogeneous and thermodynamic equilibrium model for two-phase flow was used. The effect of flashing induced by pressure drop in the heated channels and the chimney was considered. The effects of coupling between two boiling channels were investigated. It was found that in-phase-mode instability was apt to occur when channel inlet subcooling was large and boiling began in the chimney. In-phase-mode instability easily occurred when channel length became short and the chimney became long. Out-of-phase-mode instability was apt to occur when chimney length became small and boiling began in the channel. It was suggested that in-phase-mode instability was density weve oscillation induced by flashing in the chimney and out-of-phase-mode instability was density wave oscillation induced by boiling in the channels. The analytical results agreed qualitatively with experimental results.

Original languageEnglish
Pages (from-to)4067-4073
Number of pages7
JournalTransactions of the Japan Society of Mechanical Engineers Series B
Volume61
Issue number591
DOIs
Publication statusPublished - 1995 Jan 1
Externally publishedYes

Fingerprint

thermohydraulics
Linear stability analysis
Chimneys
chimneys
two phase flow
Two phase flow
boiling
Boiling liquids
Experiments
oscillations
Pressure drop
thermodynamic equilibrium
pressure drop
heaters
Thermodynamics
low pressure

Keywords

  • Boiler
  • Boiling
  • Density Wave Oscillation
  • Flashing
  • Heat Exchanger
  • Linear Stability Analysis
  • Multiphase Flow
  • Natural Circulation
  • Nuclear Reactor
  • Stability

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

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abstract = "Instability of a boiling natural circulation loop with a chimney at low pressure and low heater power was investigated by linear stability analysis and experiment. A homogeneous and thermodynamic equilibrium model for two-phase flow was used. The effect of flashing induced by pressure drop in the heated channels and the chimney was considered. The effects of coupling between two boiling channels were investigated. It was found that in-phase-mode instability was apt to occur when channel inlet subcooling was large and boiling began in the chimney. In-phase-mode instability easily occurred when channel length became short and the chimney became long. Out-of-phase-mode instability was apt to occur when chimney length became small and boiling began in the channel. It was suggested that in-phase-mode instability was density weve oscillation induced by flashing in the chimney and out-of-phase-mode instability was density wave oscillation induced by boiling in the channels. The analytical results agreed qualitatively with experimental results.",
keywords = "Boiler, Boiling, Density Wave Oscillation, Flashing, Heat Exchanger, Linear Stability Analysis, Multiphase Flow, Natural Circulation, Nuclear Reactor, Stability",
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AU - Inada, Fumio

AU - Furuya, Masahiro

AU - Yasuo, Akira

PY - 1995/1/1

Y1 - 1995/1/1

N2 - Instability of a boiling natural circulation loop with a chimney at low pressure and low heater power was investigated by linear stability analysis and experiment. A homogeneous and thermodynamic equilibrium model for two-phase flow was used. The effect of flashing induced by pressure drop in the heated channels and the chimney was considered. The effects of coupling between two boiling channels were investigated. It was found that in-phase-mode instability was apt to occur when channel inlet subcooling was large and boiling began in the chimney. In-phase-mode instability easily occurred when channel length became short and the chimney became long. Out-of-phase-mode instability was apt to occur when chimney length became small and boiling began in the channel. It was suggested that in-phase-mode instability was density weve oscillation induced by flashing in the chimney and out-of-phase-mode instability was density wave oscillation induced by boiling in the channels. The analytical results agreed qualitatively with experimental results.

AB - Instability of a boiling natural circulation loop with a chimney at low pressure and low heater power was investigated by linear stability analysis and experiment. A homogeneous and thermodynamic equilibrium model for two-phase flow was used. The effect of flashing induced by pressure drop in the heated channels and the chimney was considered. The effects of coupling between two boiling channels were investigated. It was found that in-phase-mode instability was apt to occur when channel inlet subcooling was large and boiling began in the chimney. In-phase-mode instability easily occurred when channel length became short and the chimney became long. Out-of-phase-mode instability was apt to occur when chimney length became small and boiling began in the channel. It was suggested that in-phase-mode instability was density weve oscillation induced by flashing in the chimney and out-of-phase-mode instability was density wave oscillation induced by boiling in the channels. The analytical results agreed qualitatively with experimental results.

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KW - Stability

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