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Dynamic Observation for Marangoni Flow in a Liquid Bridge of Low-Prandtl Number Liquids

低普朗特数液体液桥中马兰戈尼流动的动态观测

基本信息

批准号：
16360377
负责人：
HIBIYA Taketoshi
金额：
$ 8.58万
依托单位：
Tokyo Metropolitan University (2005-2006)Tokyo Metropolitan Institute of Technology (2004)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

Temperature oscillation and surface oscillation were examined experimentally using thermocouples and phase-shift interferometry for Marangoni convection in the geometry of a half-zone structure. For instability at high Reynolds (Marangoni) number region, various mode wave numbers appeared time-dependently. The relationship between the aspect ratio of a liquid bridge and mode wave number was kept even for high Reynolds (Marangoni) number conditions, as long as frequency of appearance of mode wave numbers was observed. Trough the wavelet transformation analysis, band structures of oscillations with various frequencies were observed for the condition with the Marangoni number of 10^4. It was also confirmed that the mode wave numbers, which appeared when flow mode transition took place from stationary to oscillator one, were sustained.Under the low Reynolds (Marangoni) number conditions, numerical modeling was performed for the liquid bridge with partial confinement and flow structure and mechanism of instability were discussed as functions of the bridge height, the open area ratio and the position of a open window. We found for the first time that two mechanisms, i.e., elliptical and centrifugal instabilities contribute to flow mode transition from stationary one to oscillatory one. The shorter the liquid bridge is, the more spherical the main flow cell becomes. It is also the case, when the open window is located at the hot are. These suggest that under these conditions elliptical instability becomes weak and that centrifugal instability becomes comparably dominant. Direct transition was also found when the open window is located at the hot portion of the liquid bridge. Flow structure was similar to that of the normal half zone structure, when the open window is located at the cold side. This geometry is effective to reduce the Marangoni number experimentally.

利用热电偶和相移干涉法对半区结构中Marangoni对流的温度振荡和表面振荡进行了实验研究。对于高雷诺(Marangoni)数区的不稳定性，不同的模式波数随时间变化。即使在高雷诺(Marangoni)数条件下，只要观察到模式波数的出现频率，液桥的纵横比与模式波数之间的关系也保持不变。通过小波变换分析，在Marangoni数为10^4的条件下，观察到了不同频率的振荡频带结构，并证实了流动模式从静止模式向振子模式转变时出现的模式波数是持续存在的。在低雷诺数(Marangoni)数条件下，对部分受限液桥进行了数值模拟，讨论了流动结构和失稳机理随桥高、开口面积比和开窗位置的变化。我们首次发现了两种机制，即椭圆不稳定性和离心不稳定性，这两种机制有助于流动模式从静止模式向振荡模式转变。液桥越短，主流室越呈球形。情况也是如此，当打开的窗户位于热的区域时。这些结果表明，在这些条件下，椭圆不稳定变弱，而离心力不稳定相对占优势。当打开的窗口位于液桥的热区时，也发现了直接的转变。当开窗位置在冷侧时，流动结构与正常半区结构相似。这种几何结构在实验上有效地降低了Marangoni数。

项目成果

期刊论文数量（66）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Normal Spectral Emissivity of Undercooled Liquid Silicon

过冷液态硅的法向光谱发射率

DOI：
发表时间：
2005
期刊：
Meas. Sci. Technol. Vol. 16
影响因子：
0
作者：
T.Tsukada;H.Kobatake;H.Fukuyama;T.Tsukada;H.Kobatake;H.Fukuyama;高橋翔;小畠秀和;H.Kobatake;I.Minato;H.Fukuyama;H.Fukuyama;H.Kobatake;I.Minato;H.Fukuyama;H.Fukuyama;H.Kobatake;塚田隆夫;杉岡健一;高橋翔;小畠秀和;福山博之;福山博之;小畠秀和;福山博之;塚田隆夫;H.Fukuyama;H.Kobatake;福山博之;福山博之;H.Kawamura
通讯作者：
H.Kawamura

Non-contact measurement of surface. oscillation due to Marangoni flow instability in a : silicon liquid bridge by phase-shift interferometry

非接触式表面测量。

DOI：
发表时间：
2005
期刊：
Journal of Materials Science 40, (9/10)
影响因子：
0
作者：
N.Okubo;R.Jono;S.Shiratori;S.Goto;T.Hibiya
通讯作者：
T.Hibiya

Oscillation Behavior of High Temperature Silicon Droplet by the Electromagnetic Levitation Technique Superimposed with Static Magnetic Fiel

静磁场叠加电磁悬浮技术研究高温硅滴的振荡行为

DOI：
发表时间：
期刊：
Materials Science and Engineering (submitted)
影响因子：
0
作者：
S.Ozawa;N.Takenaga;T.Koda;T.Hibiya;H.Kobatake;H.Fukuyama;M.Adachi;M.Watanabe;S.Awaj
通讯作者：
S.Awaj

Thermophysical property measurements of high temperature melts: results from the development and utilization of space