Hydrodynamic analog of particle trapping with the Talbot effect
Hydrodynamic analog of particle trapping with the Talbot effect
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DOI：
10.1103/physrevfluids.2.103602
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发表时间：
2017-10
期刊：
影响因子：
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通讯作者：
N. Sungar;Lucas D Tambasco;G. Pucci;P. Sáenz;J. M. Bush
中科院分区：
文献类型：
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作者：
N. Sungar;Lucas D Tambasco;G. Pucci;P. Sáenz;J. M. Bush
我们提出了一个实验研究的结果，驻波产生的表面上的一个垂直振动的液体浴刚刚超过法拉第阈值，当一排等距柱突出的表面。当柱间距是法拉第波长的两倍时，所产生的波场由柱的图像标记，该图像投影在距行固定距离的整数倍处。这种投影效应被证明类似于光学中众所周知的塔尔博特或自成像效应，并且法拉第-塔尔博特长度被定义为合理化图像的位置。一个简单的点源发射圆波的模型捕捉到了观测到的模式。我们证明，图像可以作为跳跃和行走液滴的陷阱。
We present the results of an experimental study of the standing waves produced on the surface of a vertically shaken fluid bath just above the Faraday threshold, when a row of equally spaced pillars protrudes from the surface. When the pillar spacing is twice the Faraday wavelength, the resulting wave field is marked by images of the pillars projected at integer multiples of a fixed distance from the row. This projection effect is shown to be analogous to the well-known Talbot or self-imaging effect in optics, and a Faraday-Talbot length is defined that rationalizes the location of the images. A simple model of point sources emitting circular waves captures the observed patterns. We demonstrate that the images may serve as traps for bouncing and walking droplets.