| Item type |
テクニカルレポート / Technical Report(1) |
| 公開日 |
2015-03-26 |
| タイトル |
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|
タイトル |
Experimental and numerical study on thermocapillary convection of high Prandtl number fluid in cylindrical bridge |
|
言語 |
en |
| 言語 |
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|
言語 |
eng |
| キーワード |
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主題Scheme |
Other |
|
主題 |
熱毛細管流 |
| キーワード |
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主題Scheme |
Other |
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主題 |
Marangoni対流 |
| キーワード |
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主題Scheme |
Other |
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主題 |
円筒橋 |
| キーワード |
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主題Scheme |
Other |
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主題 |
振動 |
| キーワード |
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主題Scheme |
Other |
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主題 |
シリコン油 |
| キーワード |
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主題Scheme |
Other |
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主題 |
流れの可視化 |
| キーワード |
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主題Scheme |
Other |
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主題 |
速度場 |
| キーワード |
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主題Scheme |
Other |
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主題 |
計算流体力学 |
| キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
thermocapillary flow |
| キーワード |
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言語 |
en |
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主題Scheme |
Other |
|
主題 |
Marangoni convection |
| キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
cylindrical bridge |
| キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
oscillation |
| キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
silicone oil |
| キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
flow visualization |
| キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
velocity field |
| キーワード |
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|
言語 |
en |
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主題Scheme |
Other |
|
主題 |
computational fluid dynamics |
| 資源タイプ |
|
|
資源タイプ識別子 |
http://purl.org/coar/resource_type/c_18gh |
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資源タイプ |
technical report |
| その他のタイトル |
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|
その他のタイトル |
円筒橋中の高プラントル数流体の熱毛細管対流についての実験的及び数値的研究 |
| 著者 |
西野, 耕一
Ko, K-H.
湯川, 真樹
依田, 真一
Nishino, Koichi
Ko, K-H.
Yukawa, Masaki
Yoda, Shinichi
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| 著者所属 |
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横浜国立大学 |
| 著者所属 |
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横浜国立大学 |
| 著者所属 |
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横浜国立大学 |
| 著者所属 |
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宇宙開発事業団 |
| 著者所属（英） |
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|
en |
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Yokohama National University |
| 著者所属（英） |
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|
en |
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Yokohama National University |
| 著者所属（英） |
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|
en |
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Yokohama National University |
| 著者所属（英） |
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|
en |
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National Space Development Agency of Japan |
| 出版者 |
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出版者 |
宇宙開発事業団 |
| 出版者（英） |
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出版者 |
National Space Development Agency of Japan (NASDA) |
| 書誌情報 |
宇宙開発事業団技術報告: Marangoni Convection Modeling Research: Annual Report April 1, 2001-March 31, 2002
en : NASDA Technical Memorandum: Marangoni Convection Modeling Research: Annual Report April 1, 2001-March 31, 2002
p. 43-72,
発行日 2002-12-27
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| 抄録（英） |
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内容記述タイプ |
Other |
|
内容記述 |
An experimental study has been conducted to clarify characteristics of oscillatory Marangoni convection in a liquid bridge suspended between two coaxial disks heated differentially. The disk diameter is 5 mm and the working fluid is 5cSt silicone oil. The aspect ratios and volume ratios examined are (Ar, V/V(sub 0)) = (0.5, 0.62), (0.5, 1.00), (0.33, 1.00). Simultaneous visualization of flow field and surface temperature is performed to understand their relationship during oscillation. It is shown that a pulsating mode of oscillation first appears and then the mode undergoes a transition to a rotating mode at a slightly higher temperature difference, Delta-T. The azimuthal mode number is m = 1/Ar for both pulsating and rotating modes. It is found that the pulsating and rotating modes can exist simultaneously for (Ar, V/V(sub 0)) = (0.5, 1.00), leading to a beat signal in surface temperature oscillation. A numerical calculation is done to clarify the heat-transfer characteristics of the Marangoni (or thermocapillary) convection in a liquid bridge suspended between differentially heated disks (i.e., a half-floating-zone model). Flow and temperature fields both in the liquid bridge and in the surrounding air are calculated simultaneously to evaluate the rate of heat transfer at the liquid-air interface. A commercially available CFD code is used to solve the governing equations coupled with the thermocapillary boundary condition that is incorporated into the code as a body-force term. Five different conditions giving a range of Marangoni number of 13,300-32,800 are considered. The computed velocity field in the air has revealed the presence of a recirculating zone near the liquid surface. It is generated by the two competing forces, i.e., the vertically downward shear stress due to the surface flow and the vertically upward force due to the buoyancy. The computed velocity field compares favorably with the experimental one measured by using particle image velocimetry. The temperature field computed is analyzed to evaluate the rate of heat flow from the liquid to the air. Under the present conditions, the rate of heat transfer is 0.022-0.039 W and increases monotonously with the temperature difference between the disks. The contribution of thermal radiation is estimated to be 30-40 percent. The Biot number corresponding to the convective part of the heat flow is 0.18-0.21 or 0.21-0.23, depending on the choice of temperature difference for the definition of heat-transfer coefficient. The rate of heat loss evaluated numerically is compared with the experimental data reported previously. |
| ISSN |
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収録物識別子タイプ |
ISSN |
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収録物識別子 |
1345-7888 |
| 書誌レコードID |
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収録物識別子タイプ |
NCID |
|
収録物識別子 |
AN00364784 |
| 資料番号 |
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内容記述タイプ |
Other |
|
内容記述 |
資料番号: AA0045403002 |
| レポート番号 |
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|
内容記述タイプ |
Other |
|
内容記述 |
レポート番号: NASDA-TMR-020026E |
45403002.pdf (5.2 MB)
