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DY: Dynamik und Statistische Physik

DY 40: Lyapunov Instability of Many-Body Systems

DY 40.4: Vortrag

Donnerstag, 11. März 2004, 10:30–10:45, H2

Force driven Stokes-flow between parallel plates — •Marcin Kostur¹, P Talkner¹, Z Guttenberg², S Keller³, J.O Rädler ³, and A Wixforth¹ — ¹Institut für Physik, Universität Augsburg 86135 Augsburg — ²Advalytix AG, EugenSanger Strasse 53.0 85649 Brunnthal — ³Ludwig-Maximilians-Universität München, 80539 München

Mixing and moving of small amounts of fluid poses a severe problem caused by the inherently small Reynolds numbers in micro- and nanoflows. Surface acoustic waves that can be excited by the application of a radio frequency wave to an interdigital transducer on a piezoelectric substrate generate a localized force field acting on a fluid placed above the transducer. We present the analytical as well as numerical solution of the 3-dimensional flow generated by a line force. The calculated velocity field is compared with experimental results for a 0.2mm thick fluid layer driven by surface acoustic waves.