Effects of small vibrations on Marangoni convection in a liquid bridge and numerical simulation of surface oscillation

• Material Type: 文書・図像類
• Title: Effects of small vibrations on Marangoni convection in a liquid bridge and numerical simulation of surface oscillation
• Author/Editor: Liang, R. Q.; N.Esfahany, M.; 川路, 正裕; Kawaji, Masahiro
• Author Heading: Liang, R. Q.; N.Esfahany, M.; 川路, 正裕; Kawaji, Masahiro
• Publication, Distribution, etc.: 宇宙開発事業団
• Publication Date: 2003-08-29
• Publication Date (W3CDTF): 2003-08-29
• Alternative Title: 液柱におけるマランゴニ対流の小振動の影響および表面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: 99-119
• ISSN (Periodical Title): ISSN : 1345-7888
• Text Language Code: eng
• Subject Heading: 数値シミュレーション; 液柱; 臨界温度; 3次元モデル; マランゴニ対流; 振動流; 温度勾配; 表面張力; numerical simulation; liquid bridge; critical temperature; 3 dimensional model; Marangoni convection; oscillating flow; temperature gradient; surface tension
• Target Audience: 一般
• Note (General): The effects of small vibrations on Marangoni convection were investigated using a liquid bridge of 5cSt silicone oil with a disk diameter of 7.0 mm, and an aspect ratio close to 0.5. Experiments were performed to determine the critical temperature difference data for no vibration case and with small vibrations applied. The surface oscillation amplitude was also determined experimentally, and a 3-D numerical simulation model was developed using a level set algorithm to predict the surface oscillations of an isothermal liquid bridge. The experimental results have shown that the effect of small vibrations on the onset of oscillatory flow is small since the critical temperature difference data for different aspect ratios were not affected by the vibrations. This is consistent with the results obtained for acetone bridges reported in the previous year. The peak amplitudes of surface oscillations decreased as the disk temperature difference was increased and the average liquid temperature decreased. This can be attributed to an increase in surface tension which stabilizes the liquid bridge surface. The surface oscillation amplitude, however, showed an abrupt increase at the onset of oscillatory Marangoni convection, and then a decrease as the temperature difference was further increased above the critical value. The reason for this variation in the surface oscillation amplitude with the temperature difference is unclear and needs to be investigated further. To clarify the surface oscillation phenomena induced by external vibrations, experiments and numerical simulations were conducted for an isothermal silicone oil bridge of 7.0 mm diameter. By subjecting the liquid bridge to small random vibrations, the surface oscillation frequency could be clearly determined. The computational results have also shown a similar surface oscillation frequency.; 資料番号: AA0046980004; レポート番号: NASDA-TMR-030004E
• Source: https://jaxa.repo.nii.ac.jp/?action=repository_action_common_download&item_id=42953&item_no=1&attribute_id=31&file_no=1
• 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): 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