Numerical simulation of three dimensional oscillatory flow in half-zone bridges of low Pr fluids

Material type: 文書・図像類

Author: 今石, 宣之ほか

Publisher: 宇宙開発事業団

Publication date: 2003-08-29

Material Format: Digital

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Note (General)：: In order to understand the realistic flow transitions in a small liquid bridge of molten tin with an aspect ratio of As = 2.0, which was used for expe...

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Material Type: 文書・図像類
Title: Numerical simulation of three dimensional oscillatory flow in half-zone bridges of low Pr fluids
Author/Editor: 今石, 宣之
安廣, 祥一
依田, 真一
Imaishi, Nobuyuki
Yasuhiro, Shoichi
Yoda, Shinichi
Author Heading: 今石, 宣之
安廣, 祥一
依田, 真一
Imaishi, Nobuyuki
Yasuhiro, Shoichi
Yoda, Shinichi
Publication, Distribution, etc.: 宇宙開発事業団
Publication Date: 2003-08-29
Publication Date (W3CDTF): 2003-08-29
Alternative Title: 低プラントル流体のハーフゾーン液柱における3次元振動の数値シミュレーション
Periodical title: 宇宙開発事業団技術報告: マランゴニ対流現象モデル研究:アニュアルレポート2002 = NASDA Technical Memorandum: Marangoni Convection Modeling Research: Annual Report April 1, 2002-March 31, 2003
Pages: 121-155
ISSN (Periodical Title): ISSN : 1345-7888
Text Language Code: eng
Subject Heading: 数値シミュレーション
Prandtl数
液柱
3次元モデル
境界条件
マランゴニ対流
表面温度
振動流
numerical simulation
Prandtl number
liquid bridge
3 dimensional model
boundary condition
Marangoni convection
surface temperature
oscillating flow
Target Audience: 一般
Note (General): In order to understand the realistic flow transitions in a small liquid bridge of molten tin with an aspect ratio of As = 2.0, which was used for experiments at NASDA, a long-run numerical simulation was conducted using real temperature history of the experiment for boundary conditions in the numerical code. The result revealed that the critical Marangoni numbers, flow mode and frequency of the 3-D flow of the present ramped Delta-T case are very close to those obtained in the previous works in which Delta-T was kept constant. However, the amplitude of surface temperature oscillations near the second critical point are very small (0.2 K) and its frequency is high (2.5 Hz in 1-T type oscillation). At highly super critical state, the 1-T type oscillatory flow-temperature structures started slow azimuthal motion. This rotation caused a low frequency oscillation of a local surface temperature. At further large Delta-T, there occurred an alternative changes of oscillation mode between 1-T and 2-T, whereas the slow rotation action was maintained. These results seem to explain the experimental observations. Also conducted was a set of Proper Orthogonal Decomposition (POD) analyses for oscillatory flows in liquid bridges of low Pr fluid. POD helped understanding the detailed structures of the 3-D disturbances in a liquid bridge of Pr = 0.01 fluid simulated with a condition of As = 2.0 and Ma = 35.0.
資料番号: AA0046980005
レポート番号: NASDA-TMR-030004E
Access Restrictions: 限定公開
Periodical Title (NCID): AN00364784
https://ci.nii.ac.jp/ncid/AN00364784
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): 宇宙航空研究開発機構 : 宇宙航空研究開発機構リポジトリ