Fujimoto Shuhei, Takeda Yasushi
Graduate School of Engineering, Hokkaido University, Kita-ku, Sapporo N13W8, Japan.
Phys Rev E Stat Nonlin Soft Matter Phys. 2009 Jul;80(1 Pt 2):015304. doi: 10.1103/PhysRevE.80.015304. Epub 2009 Jul 13.
We report a deformation phenomenon occurring at the interface between two immiscible liquids. The two liquids are in a cylindrical container and set into motion by a rotating lid positioned above the interface. The upper liquid is more viscous than the lower and the difference in densities between the liquids is fairly small. As the rotational speed of the lid (Omega) is increased in small increments, the center of the interface rises and the height increases. Depending on Omega , the topology of the interface changes drastically. The shape of the interface depends strongly on Omega and also the volume fraction of the liquids. Some dynamical behavior of the interface accompanies the changes in topology: interfacial waves, the generation of droplets, and interfacial instability.
我们报告了一种发生在两种不混溶液体界面处的变形现象。这两种液体置于一个圆柱形容器中，并通过位于界面上方的旋转盖子使其运动。上层液体比下层液体更黏稠，且两种液体之间的密度差相当小。随着盖子的旋转速度（Ω）以小增量增加，界面中心上升且高度增加。根据Ω的不同，界面的拓扑结构会发生剧烈变化。界面的形状强烈依赖于Ω以及液体的体积分数。界面拓扑结构的变化伴随着一些动力学行为：界面波、液滴的产生以及界面不稳定性。
