Instability and associated roll structure of Marangoni convection in high Prandtl number liquid bridge with large aspect ratio
Instability and associated roll structure of Marangoni convection in high Prandtl number liquid bridge with large aspect ratio
复制标题
DOI：
10.1063/1.4908042
复制
发表时间：
2015-02
影响因子：
4.6
通讯作者：
T. Yano;K. Nishino;H. Kawamura;I. Ueno;S. Matsumoto
中科院分区：
文献类型：
--
作者：
T. Yano;K. Nishino;H. Kawamura;I. Ueno;S. Matsumoto
本文报道了在国际空间站微重力环境下形成的液桥中Marangoni对流的不稳定性及其相关的滚动结构的实验结果。感兴趣的几何形状是高纵横比（AR =高度/直径≥ 1.0）的高普朗特数流体（Pr = 67和207）悬浮在差分加热的同轴盘之间的液桥。采用三维粒子跟踪测速技术，揭示了非定常流场及相关的雷诺应力。结果发现，不稳定的发病后的流场表现出振荡的方位角模式数m = 1和相关的RS在轴向方向上行进。当AR ≤ 1.25时，RS沿与地面流相同的方向（同向流方向）运动，而当AR ≥ 1.50时，RS沿与地面流相反的方向（逆流方向）运动，从而显示出随AR运动方向的变化。当AR ≥ 1.50时，这一行进方向与当AR ≥ 1.50时的并流方向相反。
This paper reports the experimental results on the instability and associated roll structures (RSs) of Marangoni convection in liquid bridges formed under the microgravity environment on the International Space Station. The geometry of interest is high aspect ratio (AR = height/diameter ≥ 1.0) liquid bridges of high Prandtl number fluids (Pr = 67 and 207) suspended between coaxial disks heated differentially. The unsteady flow field and associated RSs were revealed with the three-dimensional particle tracking velocimetry. It is found that the flow field after the onset of instability exhibits oscillations with azimuthal mode number m = 1 and associated RSs traveling in the axial direction. The RSs travel in the same direction as the surface flow (co-flow direction) for 1.00 ≤ AR ≤ 1.25 while they travel in the opposite direction (counter-flow direction) for AR ≥ 1.50, thus showing the change of traveling directions with AR. This traveling direction for AR ≥ 1.50 is reversed to the co-flow direction when t...