神戸大学附属図書館デジタルアーカイブ
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https://hdl.handle.net/20.500.14094/90006463
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2024-04-19
03:55 集計
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90006463 (fulltext)
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メタデータID
90006463
アクセス権
open access
出版タイプ
Accepted Manuscript
タイトル
Experimental study on interfacial and wall friction factors under counter-current flow limitation in vertical pipes with sharp-edged lower ends
著者
Goda, Raito ; Hayashi, Kosuke ; Murase, Michio ; Hosokawa, Shigeo ; Tomiyama, Akio
著者名
Goda, Raito
著者ID
A0964
研究者ID
1000060455152
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=e78459b908f278db520e17560c007669
著者名
Hayashi, Kosuke
林, 公祐
ハヤシ, コウスケ
所属機関名
工学研究科
著者名
Murase, Michio
著者ID
A0912
研究者ID
1000010252793
著者名
Hosokawa, Shigeo
細川, 茂雄
ホソカワ, シゲオ
所属機関名
工学研究科
著者ID
A0901
研究者ID
1000030211402
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=f03eb022a30248d0520e17560c007669
著者名
Tomiyama, Akio
冨山, 明男
トミヤマ, アキオ
所属機関名
工学研究科
収録物名
Nuclear Engineering and Design
巻(号)
353
ページ
110223
出版者
Elsevier B.V.
刊行日
2019-11
公開日
2021-12-01
抄録
Experiments on air-water counter-current annular flows in circular vertical pipes of 20 and 40 mm in diameter were carried out to obtain databases of the interfacial and wall friction factors. The pipes were made of transparent acrylic resin to observe counter-current flow limitation (CCFL) in the pipe. The vertical pipe was connected to an upper and a lower tank. The liquid and gas phases were supplied to the upper and lower tanks, respectively. The liquid volume flow rate, the pressure gradient and the liquid volume fraction were measured to evaluate the friction factors. The flows in the pipe were observed using a high-speed video camera and the flow pattern under CCFL was identified using the time-strip visualization technique. The main conclusions obtained under the present experimental conditions are as follows: (1) the flows under CCFL condition can be classified into four regimes, i.e. the smooth film, the transition from smooth film to rough film regimes, the rough film with large amplitude disturbance waves forming at the lower pipe end, and the rough film with simultaneous onsets of disturbance waves inside the pipe, (2) the slope of the CCFL diagram depends on the flow regimes, (3) the flow structure strongly affects the friction factors, and therefore, available correlations of friction factors not accounting for their dependences on the flow regimes cannot give good evaluations, (4) the wall friction factor can be correlated in terms only of the liquid Reynolds number, (5) the interfacial friction factor in the rough film regimes can be well correlated in terms of the gas Wallis parameter (Froude number) since the interface structure strongly depends on the Wallis parameter, and (6) the CCFL model derived using the present empirical correlations of friction factors agrees well with the CCFL characteristics data.
キーワード
CCFL characteristics
Friction factors
Flow structure
Time-strip flow visualization
カテゴリ
工学研究科
学術雑誌論文
権利
© 2019 Elsevier B.V.
This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
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資源タイプ
journal article
言語
English (英語)
ISSN
0029-5493
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eISSN
1872-759X
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NCID
AA11535107
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関連情報
DOI
https://doi.org/10.1016/j.nucengdes.2019.110223
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