Metamaterial control of the surface acoustic wave streaming jet
Metamaterial control of the surface acoustic wave streaming jet
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DOI：
10.1088/1361-6463/ad2563
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发表时间：
2024-05-10
影响因子：
3.4
通讯作者：
Nash，G. R.
中科院分区：
文献类型：
--
作者：
Pouya，C.;Nash，G. R.
表面声波（SAW）流动现象（其中产生流动射流）发生在SAW在固体表面上传播时与水相互作用，并且支撑SAW微流体的日益重要的领域。流动射流的一个关键特性是瑞利角，即射流相对于固体表面法线形成的角度，其由声波在流体和固体中的速度之比确定。尽管动态调整该角度的能力将为微流体控制提供新的工具，但是SAW速度通常由固体和液体材料性质的特性固定。在本文中，我们表明，使用有限元方法建模，改变SAW瑞利波相速度图案化的超材料阵列，由方形环形孔组成，到表面上的SAW器件可以改变声流瑞利角约两个因素，在良好的协议与计算的基础上的速度的变化。
The phenomenon of surface acoustic wave (SAW) streaming, where a streaming jet is created, occurs when an SAW propagating on the surface of a solid interacts with water, and underpins the increasingly important area of SAW microfluidics. A key characteristic of the streaming jet is the Rayleigh angle, ie the angle at which the jet is formed relative to the surface normal of the solid, which is determined by the ratio of the velocity of the acoustic wave in the fluid and in the solid. Although the ability to dynamically tune this angle would offer a novel tool for microfluidic control, the SAW velocity is normally fixed by the characteristics of the solid and liquid material properties. In this paper we show, using finite element method modelling, that changing the SAW Rayleigh wave phase velocity by patterning a metamaterial array, consisting of square annular holes, onto the surface of an SAW device can change the acoustic streaming Rayleigh angle by approximately a factor of two, in good agreement with calculations based on the change in velocity.