Oscillating instability in bouncing droplet crystals
Oscillating instability in bouncing droplet crystals
复制标题
弹跳液滴晶体的振荡不稳定性
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
Y. Couder
中科院分区：
文献类型：
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作者：
A. Eddi;A. Boudaoud;Y. Couder
在振动的液浴中，弹跳的液滴可以通过它们发出的表面波相互作用，形成各种类型的稳定结晶团。当强迫加速度大于某一起始值时，聚集体呈现全局自发振动模式。在这里，我们实验研究了这些振动在六角形和方形晶格团簇中，并表明在模式之间存在长程选择。我们提出了基于波传播的固有延迟的不稳定性的物理解释和一个简单的模型来解释观察到的振动特征。
Bouncing droplets on a vibrated liquid bath can interact via the surface waves they emit and form various types of stable crystalline clusters. When increasing the forcing acceleration over an onset value, the aggregates present a global and spontaneous vibration mode. Here, we investigated experimentally these vibrations in hexagonal and square lattice clusters and show that there is a long-range selection amongst the modes. We propose a physical interpretation of the instability based on the intrinsic delay due to wave propagation and a simple model that explains the observed features of the vibrations.