Prediction of Liquid Film Dryout in Two-Phase Annular-Mist Flow in a Uniformly Heated Narrow Tube Development of Analytical Method under BWR Conditions.
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- UTSUNO Hideaki
- Hitachi Works, Hitachi, Ltd. Graduate School of Science and Engineering Ibaraki University
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- KAMINAGA Fumito
- Ibaraki University
Bibliographic Information
- Other Title
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- Prediction of Liquid Film Dryout in Two
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Abstract
A method was developed based on the conservation lows to predict critical heat flux (CHF) causing liquid film dryout in two-phase annular-mist flow in a uniformly heated narrow tube under BWR conditions. The applicable range of the method is within the pressure of 3-9MPa, mass flux of 500-2, 000kg/m2•s, heat flux of 0.33-2.0MW/m2 and boiling length-to-tube diameter ratio of 200-800.<BR>The two-phase annular-mist flow was modeled with the three-fluid streams with liquid film, entrained droplets and gas flow. Governing equations of the method are mass continuity and energy conservation on the three-fluid streams. Constitutive equations on the mass transfer which consist of the entrainment fraction at equilibrium and the mass transfer coefficient were newly proposed in this study.<BR>Confirmation of the present method were performed in comparison with the available film flow measurements and various CHF data from experiments in uniformly heated narrow tubes under high pressure steam-water conditions. In the heat flux range (q"<2MW/m2) practical for a BWR, agreement of the present method with CHF data was obtained as, (Averaged ratio)±(Standard deviation)=0.984+0.077, which was shown to be the same or better agreement than the widely-used CHF correlations.
Journal
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- Journal of Nuclear Science and Technology
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Journal of Nuclear Science and Technology 35 (9), 643-653, 1998
Atomic Energy Society of Japan
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Keywords
Details 詳細情報について
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- CRID
- 1390001204094962688
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- NII Article ID
- 10002080023
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- NII Book ID
- AA00703720
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- COI
- 1:CAS:528:DyaK1cXntlKlsrw%3D
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- ISSN
- 18811248
- 00223131
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- NDL BIB ID
- 4565728
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed