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

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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.