图6. 环状气泡阶段实验与数值结果对比(数值计算的无量纲时间为:1.431, 1.453, 1.494, 1.550,每幅图的坐标范围 是:$-1.5 \leqslant r \leqslant 1.5$, $-1.5 \leqslant z \leqslant 2.8$)
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Fig.6. Comparison between the experimental observation and numerical simulation for a bubble beneath a free surface during the toroidal bubble stage (the dimensionless times for the simulation are: 1.431, 1.453, 1.494 and 1.550, respectively. Horizontal and vertical axes of each frame are $-1.5 \leqslant r \leqslant 1.5$ and $-1.5 \leqslant z \leqslant 2.8$, respectively)
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