Shearing conditions on the interface of a spherical water drop sinking in silicone oil
Shearing conditions on the interface of a spherical water drop sinking in silicone oil
复制标题
球形水滴沉入硅油界面的剪切条件
DOI：
10.1007/bf03185143
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
M. Yamauchi
中科院分区：
文献类型：
--
作者：
T. Uemura;M. Yamauchi
本文通过实验来获取有关水滴与周围油之间界面状况的定量信息。通过引入新的照明技术和远心镜头来测量界面非常接近区域的速度分布。它能够精确测量界面附近区域的速度分布。尽管测量的速度分布受到实验管实心壁的强烈影响，但对于干净的界面，界面上的内部和外部速度的一致性得到了明确的证实。界面上的剪应力与垂直于界面的速度梯度成正比，清楚地显示了污染界面的情况，它可以分为两部分。从前驻点到分离点附近，剪应力的分布与Hadamard解析解的分布非常吻合，而界面后半部分的分布则表现出截然不同的特征，这可能受到表面污染的强烈影响。
This paper deals with the experiment to obtain quantitative information about conditions of the interface between a water drop and surrounding oil. Velocity distributions in very close region of the interface are measured by introducing a new illumination technique and a telecentric lens. It enables precise measurements of velocity distributions in the close region to the interface. Although the measured velocity distributions exhibit strong influence from the solid wall of an experimental tube, the coincidence of inner and outside velocities on the interface is clearly confirmed for the clean interface. The shearing stresses on the interface, which are proportional to the velocity gradient normal to the interface, clearly show conditions of contaminated interface, which can be divided into two parts. From front stagnation point to somewhere near a separation point, the distribution of shearing stresses is well coincide with that of the Hadamard’s analytical solution, while the distribution on the latter part of the interface shows quite different feature, which is supposed to be strongly influenced by contamination of the surface.