Modal Rayleigh-like streaming in layered acoustofluidic devices
Modal Rayleigh-like streaming in layered acoustofluidic devices
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DOI：
10.1063/1.4939590
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发表时间：
2016-01-01
影响因子：
4.6
通讯作者：
Hill, Martyn
中科院分区：
文献类型：
--
作者：
Lei, Junjun;Glynne-Jones, Peter;Hill, Martyn
经典的瑞利流是众所周知的，并且可以使用Nyborg的极限速度方法来建模，如由平行于主声共振的轴线的壁附近的流体速度驱动的。我们以前已经证明了四象限换能器平面流动模式的存在和机制，在薄层声流体装置中，由垂直于主声传播轴线的壁上的极限速度驱动。我们最近通过实验发现，有第三种情况类似于瑞利流，但它是一个更复杂的模式有关的三维腔模式的外壳。这种流动具有与模式的每个腔轴中的有效波长相关的涡旋尺寸，其可以比在具有瑞利流动的一维情况下发现的涡旋尺寸大得多。我们将在这里称之为模态瑞利流，并表明它可以是重要的分层声流体操纵设备。本文旨在建立条件下，这些都是占主导地位的，并显示了如何限制速度场为每个涉及到不同部分的复杂的声学强度模式在驾驶边界。(C)2016 AIP Publishing LLC.
Classical Rayleigh streaming is well known and can be modelled using Nyborg's limiting velocity method as driven by fluid velocities adjacent to the walls parallel to the axis of the main acoustic resonance. We have demonstrated previously the existence and the mechanism of four-quadrant transducer plane streaming patterns in thin-layered acoustofluidic devices which are driven by the limiting velocities on the walls perpendicular to the axis of the main acoustic propagation. We have recently found experimentally that there is a third case which resembles Rayleigh streaming but is a more complex pattern related to three-dimensional cavity modes of an enclosure. This streaming has vortex sizes related to the effective wavelength in each cavity axis of the modes which can be much larger than those found in the one-dimensional case with Rayleigh streaming. We will call this here modal Rayleigh-like streaming and show that it can be important in layered acoustofluidic manipulation devices. This paper seeks to establish the conditions under which each of these is dominant and shows how the limiting velocity field for each relates to different parts of the complex acoustic intensity patterns at the driving boundaries. (C) 2016 AIP Publishing LLC.