半浮区液桥自由面振荡特征

使用一套双路同步显微放大录像及图像处理系统,研究了夹角为90°的两个竖直剖面沿轴向不同高度液桥自由表面的位移振荡,得到轴向不同高度上的环向相位差,观测到在振荡周期内液桥表面轮廓线在不同时刻均不相交的特点。实验结果表明,液桥自由面振荡除具有径向扰动及轴向振荡变化外,还存在环向波动变化。根据实验结果,讨论了环向波动基本变化规律以及本实验在测量精度和测量误差方面存在的问题。

THE FEATURE OF FREE SURFACE OSCILLATION IN LIQUID BRIDGE OF HALF FLOATING ZONE

Based on the experiment of small dynamic bond number on the ground, the free surface oscillation in the marangoni convection of the half floating zone is studied. Two sets of synchronous optical video systems and associated mage processing units are used to observe the displacement oscillation of the free surface radii in two perpendicular cross-sections. The phase difference distribution of oscillation in two profiles along the axial direction is measured. According to the experimental results, there is azimuthal variation, in addition to the oscillation in the radial and exial direction. The basic wave pattern of azimuthal motion and the sensitivity and error of measurement are also discussed in this paper.