大普朗特数大液桥浮力-热毛细对流地面实验

吴勇强; 段俐; 李永强; 康琦

doi:10.6052/0459-1879-12-148

大普朗特数大液桥浮力-热毛细对流地面实验

doi: 10.6052/0459-1879-12-148

吴勇强^2,1,
段俐²,
李永强¹,
康琦^2, ,

1.
东北大学理学院, 沈阳 110004
2. 中国科学院力学研究所微重力实验室,北京 100190

基金项目: 国家自然科学基金重点基金项目(11032011, 10972224), 中国科学院方向性项目(KJCX2-YW-L08)和载人航天空间科学项目资助.

详细信息

通讯作者:
康琦

中图分类号: O363.2
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出版历程
- 收稿日期: 2012-05-21
- 修回日期: 2012-07-10
- 刊出日期: 2012-11-18

GROUND EXPERIMENTS OF BOUYANT THERMOCAPILLARY CONVECTION OF LARGE SCALE LIQUID BRIDGE WITH LARGE PRANDTL NUMBER

1.
College of Science, Northeastern University, Shenyang 110004, China
2. National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China

Funds: The project was supported by the National Natural Science Foundation of China (11032011, 10972224), the Chinese Academy of Sciences Directional Project (KJCX2-YW-L08) and the Manned Space Space Science Project.

摘要

摘要: 通过地面实验研究大尺寸液桥的浮力-热毛细对流. 实验采用2cst硅油(Pr=28.571),研究了不同高径比(A=l/d)和体积比的液桥起振,分析了温度振荡频率及相位变化,探讨了热流体波的问题. 实验液桥的桥柱直径为20mm,由于受重力的限制,建立了3～4.25mm范围内的矮桥. 通过伸入液桥内部不同位置的热电偶的温度信号,发现流场是同时起振的,不同的桥高和体积比有不同的振荡模式,并且随着温差的增加,频率近似以线性增加,各点的振荡相位是一个连续性变化的过程. 不同高径比的液桥转捩到混沌的途径是不一样的.
- 大尺寸 /
- 液桥 /
- 温度振荡 /
- 频率 /
- 相位
Abstract: Thermocapillary-driven convection in a large scale liquid bridge was investigated by ground experiments in this paper. We used 2 cst silicone oil (Pr=28.571), observed the onset of liquid bridge with different aspect ratios (A=l/d) and volumes, analyzed the transformation of temperature oscillation frequency and phase, discussed the problems of hydrothermal waves. The column diameter of liquid bridge was 20mm. Due to the limit by gravity, we constructed the bridge with 3-4.25mm height. With the help of five azimuthal thermocouples inserted in the bridge interior, we discovered that temperature oscillation in flow field occurs at the same time; bridges with different aspect ratios and volumes have different flow modes, and with the increase of temperature difference, the frequency increases approximately linearly, and oscillation phase of each temperature oscillation curve continuously changes. Bridges with different aspect ratios have different ways to chaos.
- large scale /
- liquid bridge /
- temperature oscillation /
- frequency /
- phase

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参考文献(9)

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