炉容器プレナム内での温度成層界面の上昇速度に関する検討

Material type: 文書・図像類

Author: アキラトーマストクヒロほか

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Publication date: 1999-09

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Note (General)：: The quantification of the rate-of-rise of the thermal stratification interface, a "thin" vertical zone where the temperature gradient is the steepest,...

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Summary, etc.：: The quantification of the rate-of-rise of the thermal stratification interface, a "thin" vertical zone where the temperature gradient is the steepest,...

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Material Type: 文書・図像類
Title: 炉容器プレナム内での温度成層界面の上昇速度に関する検討
Author/Editor: アキラトーマストクヒロ
木村暢之
Author Heading: アキラトーマストクヒロ
木村暢之
Publication Date: 1999-09
Publication Date (W3CDTF): 1999-09
Alternative Title: A Note on the representation of rate-of-rise of the thermal stratification interface in reactor plenum
Periodical title: JNC TN9400 2000-015
Text Language Code: eng
Target Audience: 一般
Note (General): The quantification of the rate-of-rise of the thermal stratification interface, a "thin" vertical zone where the temperature gradient is the steepest, is important in assessing the potential implications of thermally-induced stress problems in liquid-metal cooled reactors. Thermal stratification can likewise occur in confined volumes containing ordinary fluids (Pr$\geq$1), where there is an input of thermal convective energy. In the prominent case of liquid metal reactors, there have been many studies on quantifying the rate-of-rise of a defined stratification interface, in terms of one or more of the following dimensionless groups, mainly: Richardson (Ri), Reynolds (Re), Grashof (Gr), Rayleigh (Ra) and/or Froude (Fr) numbers. Stratification is also a transient process in the volume in question. In the present work the anthors presents a derivation based on order-of-magnitude analysis (OMA), including an sensible energy balance, that produces a new representation more consistent than p
液体金属冷却高速炉(LMFBR)において、温度成層界面(軸方向温度勾配が最も急峻となる軸方向位置)の上昇速度を定量化することは、構造材への熱荷重を評価する上で重要である。温度成層化現象は、対流による生成エネルギーの入力があるPr>1の密閉空間内流体においても同様に発生する。LMFBRの温度成層化現象に関しては、成層界面の上昇速度を無次元数群(Ri, Re, Gr, Ra[Fr])により定量化する研究が数多く行われている。温度成層化現象は、炉容器プレナム内での過渡事象である。本研究では、エネルギーバランスを考慮に入れた概略解析(order-of-magnitude analysis: OMA)に基づく成層界面上昇速度の整理を行い、既往試験結果がひとつの整理式によってまとめられることを示した。さらに、本整理は、自然/共存/強制対流問題における保存式のOMAと整合がとれていることを確認した。
Source: /JNC-TN9400-2000-015.pdf （fulltext）
https://jopss.jaea.go.jp/pdfdata/JNC-TN9400-2000-015.pdf
Access Restrictions: 限定公開
Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
https://irdb.nii.ac.jp
Original Data Provider (Database): 日本原子力研究開発機構 : JOPSS:JAEA Originated Papers Searching System