声表面波微器件的建模--边界条件的研究
Modeling of microdevices for SAW-based acoustophoresis --- a study of boundary conditions
摘要：
我们提出了一种有限元方法建模的声泳器件由一个单一的，长的，直的，充满水的微通道包围的弹性壁的硼硅酸盐玻璃（派热克斯玻璃）或弹性体聚二甲基硅氧烷（PDMS）和放置在顶部的压电式传感器，驱动装置的表面声波（SAW）。我们将这些完整的固体-流体模型中产生的声场与仅由水域组成的简化的流体模型中获得的声场进行比较，近似边界条件代表周围的固体。减少模型被发现，只有近似的声学硬派热克斯系统在有限的程度上为大的壁厚，而不是在所有的声学软PDMS系统。
英文摘要：
We present a finite-element method modeling of acoustophoretic devices consisting of a single, long, straight, water-filled microchannel surrounded by an elastic wall of either borosilicate glass (pyrex) or the elastomer polydimethylsiloxane (PDMS) and placed on top of a piezoelectric transducer that actuates the device by surface acoustic waves (SAW). We compare the resulting acoustic fields in these full solid-fluid models with those obtained in reduced fluid models comprising of only a water domain with simplified, approximate boundary conditions representing the surrounding solids. The reduced models are found to only approximate the acoustically hard pyrex systems to a limited degree for large wall thicknesses and not at all for the acoustically soft PDMS systems.
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