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: 2001-12-25

Material Format: Digital

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Note (General)：: A set of numerical simulations was conducted to understand characteristics of oscillatory Marangoni convection in half-zone liquid bridges with variou...

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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: 2001-12-25
Publication Date (W3CDTF): 2001-12-25
Alternative Title: 低プラントル数流体の半ゾーン液体ブリッジにおける3次元振動流の数値シミュレーション
Periodical title: 宇宙開発事業団技術報告: Marangoni Convection Modeling Research: Annual Report April 1, 2000 - March 31, 2001 = NASDA Technical Memorandum: Marangoni Convection Modeling Research: Annual Report April 1, 2000 - March 31, 2001
Pages: 133-144
ISSN (Periodical Title): ISSN : 1345-7888
Text Language Code: eng
Subject Heading: 振動流体
液体ブリッジ
3次元モデル
マランゴニ対流
数値シミュレーション
プラントル数
温度分布
レイノルズ数
oscillating flow
liquid bridge
three dimensional model
Marangoni convection
numerical simulation
Prandtl number
temperature distribution
Reynolds number
Target Audience: 一般
Note (General): A set of numerical simulations was conducted to understand characteristics of oscillatory Marangoni convection in half-zone liquid bridges with various aspect ratios (from 0.6 to 2.2) and Prandtl numbers (from 0 to 0.02) by a finite difference method. The simulation results indicated that under smaller temperature differences the flow in the liquid bridge is axisymmetric but it becomes unstable against a three dimensional disturbances beyond a certain threshold value of temperature difference. The flow becomes steady three dimensional. This steady flow becomes unstable against time dependent three dimensional disturbance beyond a second critical condition. The numerical simulations revealed the critical conditions, 3 D structure of disturbances and oscillation modes. The first critical conditions showed good agreements with those of linear stability analyses. The second critical conditions also agreed with previous values and gave new critical values for wide range of aspect ratio. Based on these simulations, a flow map was proposed for Pr = 0 fluid. Critical Reynolds numbers, flow mode and types of oscillations were also determined for Pr = 0.01 and 0.02 fluids.
資料番号: AA0032601005
レポート番号: NASDA-TMR-010015E
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