神戸大学附属図書館デジタルアーカイブ
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学内刊行物
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https://hdl.handle.net/20.500.14094/90005760
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2024-04-26
12:04 集計
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90005760 (fulltext)
pdf
1.52 MB
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メタデータID
90005760
アクセス権
open access
出版タイプ
Accepted Manuscript
タイトル
Conductive and viscous sub-layers on forced convection and mechanism of critical heat flux during flow boiling of subcooled water in a circular tube at high liquid Reynolds number
著者
Hata, K. ; Liu, Q. S. ; Masuzaki, S.
著者ID
A0220
研究者ID
1000060115912
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=62adee6b8fa38525520e17560c007669
著者名
Hata, K.
畑, 幸一
ハタ, コウイチ
所属機関名
海事科学研究科
著者ID
A1598
研究者ID
1000080294263
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=74ad545da448b4c6520e17560c007669
著者名
Liu, Q. S.
劉, 秋生
リュウ, シュウセイ
所属機関名
海事科学研究科
著者名
Masuzaki, S.
収録物名
Heat and Mass Transfer
巻(号)
55(1)
ページ
175-195
出版者
Springer
刊行日
2019-01
公開日
2020-02-01
抄録
The turbulent heat transfer, the subcooled boiling heat transfer and the steady state CHF for a Pt-circular test tube of a 3 mm inner diameter and a 100 mm heated length are measured with a wide range of inlet subcooling and flow velocity at high liquid Reynolds number, i.e. Re-d = 3.01x10(4) to 1.43x10(5). The inner surface temperature of the Pt-circular test tube calculated by the steady one-dimensional heat conduction equation is compared with the values derived from authors' turbulent heat transfer correlation and with the numerical solutions of the RANS equations (Reynolds Averaged Navier-Stokes Simulation) of k-ε turbulence model for the flow velocities ranging from 4 to 21 m/s. The thicknesses of conductive sub-layer from non-boiling regime to CHF are measured by numerically analyzing the heat transfers with conductive sub-layer on forced convection and with thinner one dissipated by the evaporation on nucleate boiling. The thicknesses of viscous sub-layer on forced convection are estimated from the thicknesses of the conductive sub-layer and Prandtl numbers of the surface temperature on the heated surface. Furthermore, the thicknesses of conductive sub-layer at the CHF point are extrapolated from the measured values at various flow velocities. The experimental values of the CHF are also compared with authors' widely and precisely predictable correlations of critical heat flux during flow boiling of subcooled water and the corresponding theoretical values of the liquid sub-layer dry-out models suggested by other researchers, respectively. The authors' correlations and other researchers' theoretical values can represent the subcooled boiling CHFs obtained in this study within the ranges of -13.27 to 6.76% difference and - 32.51 to 13.16% one, respectively. A suggestion based on the experimental data as to what the dominant mechanism is for critical heat flux during flow boiling of subcooled water on a vertical circular tube is confirmed again at high liquid Reynolds number. The transitions to film boiling at the subcooled water flow boiling on the Pt test tube of d = 3 mm and L = 100 mm would occur due to the liquid sub-layer dry-out model at the steady-state CHF as well as those on the Pt test tube of d = 3 mm and L = 66.5 mm, but not due to the heterogeneous spontaneous nucleation and the hydro-dynamic instability.
カテゴリ
海事科学研究科
学術雑誌論文
権利
© Springer-Verlag GmbH Germany, part of Springer Nature 2018. This is a post-peer-review, pre-copyedit version of an article published in Heat and Mass Transfer. The final authenticated version is available online at: https://doi.org/10.1007/s00231-018-2458-4
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資源タイプ
journal article
言語
English (英語)
ISSN
0947-7411
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eISSN
1432-1181
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NCID
AA1145499X
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関連情報
DOI
https://doi.org/10.1007/s00231-018-2458-4
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