Influence of a flow obstacle on the generation of burnout in boiling two-phase upward flow within a vertical annular channel

Shoji Mori, Tohru Fukano, Kentaro Maeda

Research output: Contribution to journalArticle

Abstract

If a flow obstruction such as a spacer is set in a boiling two-phase flow within an annular channel, the inner tube of which is used as a heater, the temperature on the surface of the heater tube is severely affected by the existence of the spacer. In some case the spacer has a cooling effect, and in the other case it causes the dryout of the cooling liquid film on the heating surface resulting in the burnout of the tube. But the burnout mechanism near the spacer is not still clear. In the present paper we discuss temperature fluctuation characteristics in relation to the change of the flow configuration near the spacer in boiling two-phase flow when burnout occurs.

Original languageEnglish
Pages (from-to)527-535
Number of pages9
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume68
Issue number666
DOIs
Publication statusPublished - Jan 1 2002
Externally publishedYes

Fingerprint

burnout
two phase flow
Two phase flow
boiling
spacers
Boiling liquids
Cooling
Liquid films
tubes
heaters
Heating
Temperature
liquid cooling
cooling
heating
temperature
causes
configurations

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

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abstract = "If a flow obstruction such as a spacer is set in a boiling two-phase flow within an annular channel, the inner tube of which is used as a heater, the temperature on the surface of the heater tube is severely affected by the existence of the spacer. In some case the spacer has a cooling effect, and in the other case it causes the dryout of the cooling liquid film on the heating surface resulting in the burnout of the tube. But the burnout mechanism near the spacer is not still clear. In the present paper we discuss temperature fluctuation characteristics in relation to the change of the flow configuration near the spacer in boiling two-phase flow when burnout occurs.",
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AU - Maeda, Kentaro

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AB - If a flow obstruction such as a spacer is set in a boiling two-phase flow within an annular channel, the inner tube of which is used as a heater, the temperature on the surface of the heater tube is severely affected by the existence of the spacer. In some case the spacer has a cooling effect, and in the other case it causes the dryout of the cooling liquid film on the heating surface resulting in the burnout of the tube. But the burnout mechanism near the spacer is not still clear. In the present paper we discuss temperature fluctuation characteristics in relation to the change of the flow configuration near the spacer in boiling two-phase flow when burnout occurs.

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