School of Science, Nanjing University of Science and Technology, China.
School of Science, Nanjing University of Science and Technology, China.
Ultrason Sonochem. 2021 Mar;71:105375. doi: 10.1016/j.ultsonch.2020.105375. Epub 2020 Nov 1.
Herein, we investigated experimentally the dynamics of three laser-induced, same-sized, symmetrically aligned, and synchronized bubbles. Three synchronized laser beams split from the same beam using a Diffractive Optical Element splitter were focused on water, and then we obtained three bubbles. Another nanosecond laser pulse was used to probe the bubbles to obtain shadowgraphs. The exact delay of the excited and detected light was controlled using a delay generator. The results revealed that the maximum volumes of bubbles in arrays decrease as the normalized distance falls, while the lifetimes and translation increase. It was explained by the interaction between the acoustic radiation of bubbles and the surrounding bubbles. The shrinkage of linear bubble arrays exists an anomaly. The center bubbles were stretched, to ellipsoid, stick, even fractured, by the peripheral bubbles. The closer they are, the more distinct is the above phenomenon. However, when the normalized distance was sufficiently small, instead of being stretched, the center bubbles were compressed to disk shape and thus shrank with the whole array. Finally, the dependence of the distance on the energy transfer of the bubble system is also discussed.
在此，我们通过实验研究了三个激光诱导的、大小相同、对称排列且同步的气泡的动力学特性。三个同步激光束通过衍射光学元件分束器从同一光束中分出，聚焦在水中，然后得到三个气泡。另一个纳秒激光脉冲用于探测气泡以获得阴影图。使用延迟发生器精确控制激发光和探测光的延迟时间。结果表明，随着归一化距离的减小，阵列中气泡的最大体积减小，而寿命和位移增加。这可以用气泡的声辐射与周围气泡之间的相互作用来解释。线性气泡阵列的收缩存在异常现象。中心气泡被外围气泡拉伸成椭圆形、棒状，甚至断裂。它们之间的距离越近，上述现象就越明显。然而，当归一化距离足够小时，中心气泡没有被拉伸，而是被压缩成盘状，因此整个阵列会收缩。最后，还讨论了距离对气泡系统能量传递的依赖性。
