Surface acoustic wave driven micro-flows: Flow control and transport of finite size particles

少量流体的操作和流体内部流动模式的详细控制是在微流体设备上成功处理生物和化学材料的先决条件。由压电基板上的表面声波引起的声流已被证明是在小体积流体中产生流动的一种有效和通用的方法。与已经深入研究的压力驱动的泊泽维尔型通道剪切流相比，表面声波产生的流型更为复杂，通常表现为一个或多个漩涡。这个项目的目标是利用和改进这些复杂的流动模式，并研究扩展粒子在这种流场中的输运性质。

The manipulation of small amounts of fluids and a detailed control of the flow patterns within the fluid are preconditions for a successful processing of biological and chemical materials on microfluidic devices known as labs-on-a-chip. Acoustic streaming caused by surface acoustic waves on piezoelectric substrates has proved to be an efficient and versatile method to generate flows in small fluid volumes. In contrast to well investigated pressure driven Poiseuille type shear flows in channels, the surface acoustic wave generated stream patterns are more complex and typically display one or more vortices. It is the goal of this project to utilize and improve these complex flow patterns and to investigate the transport properties of extended particles in such flow fields.