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/20.500.14094/90004947
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2024-04-27
05:56 集計
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90004947 (fulltext)
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メタデータID
90004947
アクセス権
open access
出版タイプ
Accepted Manuscript
タイトル
Local void fraction and heat transfer characteristics around tubes in two-phase flows across horizontal in-line and staggered tube bundles
著者
Murakawa, Hideki ; Baba, Misaki ; Miyazaki, Takeru ; Sugimoto, Katsumi ; Asano, Hitoshi ; Ito, Daisuke
著者ID
A0958
研究者ID
1000040467668
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=a072a04756d94ee3520e17560c007669
著者名
Murakawa, Hideki
村川, 英樹
ムラカワ, ヒデキ
所属機関名
工学研究科
著者名
Baba, Misaki
著者名
Miyazaki, Takeru
著者ID
A1161
研究者ID
1000040420468
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=69addadf33dee162520e17560c007669
著者名
Sugimoto, Katsumi
杉本, 勝美
スギモト, カツミ
所属機関名
工学研究科
著者ID
A0913
研究者ID
1000010260647
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=a44fc86204b3e5d2520e17560c007669
著者名
Asano, Hitoshi
浅野, 等
アサノ, ヒトシ
所属機関名
工学研究科
著者名
Ito, Daisuke
収録物名
Nuclear Engineering and Design
巻(号)
334
ページ
66-74
出版者
Elsevier B.V.
刊行日
2018-08-01
公開日
2020-09-01
抄録
This study investigated the local characteristics of void-fraction distribution and heat transfer around tubes in two-phase flows under adiabatic conditions using vertical duct test sections with inner dimensions of 90 x 90 mm(2). Two kinds of test sections, in-line and staggered tube bundles, each containing five columns and eight rows, were employed for the measurements. The tube diameter of each was 15 mm, and the pitch-to-diameter ratio was 1.5 for both bundles. The working fluids were air and water, and the experiments were performed under atmospheric pressure in a temperature range of 20-25 ºC. Superficial liquid velocity, J(L), and gas velocity, J(G), ranged from 0.1 to 0.3 m/s and 0.03 to 1.19 m/s, respectively. Two-dimensional void-fraction distributions were obtained using X-ray radiography and the local heat-transfer coefficients were measured using a platinum wire electrode placed on a tube that could be rotated. In the experiments, the time-averaged void fraction increased at the maximum and vertical minimum gaps for the in-line tube bundle, whereas the void fraction increased upstream of the tubes for the staggered tube bundle. In the bubbly flow condition, enhancement of the heat transfer by bubbles motion clearly occurred between ±90 and 180° for the in-line tube bundle, and increased all over the pipe for the staggered tube bundle. The increase in the local heat transfer coefficients by bubbles motion was more apparent for the in-line tube bundle. The average heat transfer coefficient in the staggered tube bundle was higher than that in the in-line tube bundle in the bubbly flow regime, whereas the results were opposite in the intermittent flow regime.
キーワード
Heat exchanger
Void fraction
Heat transfer coefficient
Flow regime
カテゴリ
工学研究科
学術雑誌論文
権利
© 2018 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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関連情報
DOI
https://doi.org/10.1016/j.nucengdes.2018.05.005
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