Thermohydraulic instability of boiling natural circulation loop with a chimney. (Part I. Linear stability analysis using homogeneous two-phase flow model and experiment on thermohydraulic instability induced by flashing)

F. Inada, Masahiro Furuya, A. Yasuo

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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 chimmey 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 was shortened and chimney length was increased. Out-of-phase-mode instability was apt to occur when chimney length was decreased and boiling began in the channel.

Original languageEnglish
Pages (from-to)563-576
Number of pages14
JournalHeat Transfer - Japanese Research
Volume24
Issue number7
Publication statusPublished - 1995 Dec 1
Externally publishedYes

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

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

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 chimmey 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 was shortened and chimney length was increased. Out-of-phase-mode instability was apt to occur when chimney length was decreased and boiling began in the channel.",
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T1 - Thermohydraulic instability of boiling natural circulation loop with a chimney. (Part I. Linear stability analysis using homogeneous two-phase flow model and experiment on thermohydraulic instability induced by flashing)

AU - Inada, F.

AU - Furuya, Masahiro

AU - Yasuo, A.

PY - 1995/12/1

Y1 - 1995/12/1

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 chimmey 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 was shortened and chimney length was increased. Out-of-phase-mode instability was apt to occur when chimney length was decreased and boiling began in the channel.

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 chimmey 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 was shortened and chimney length was increased. Out-of-phase-mode instability was apt to occur when chimney length was decreased and boiling began in the channel.

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