Berlin 2008 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 28: Micro and Nano Fluidics III: Migration and flow
CPP 28.6: Vortrag
Donnerstag, 28. Februar 2008, 18:00–18:15, C 264
Vortex formation in travelling wave-driven micropumps — •Richard Stein1, Magnus Jäger2, Andreas Münch3, Alexander Mielke3, Michael Böttcher2, Michael Stuke4, and Claus Duschl1 — 1Fraunhofer Institute for Biomedical Engineering (IBMT), Am Mühlenberg 13, 14476 Potsdam, Germany — 2Saarland University, Faculty Clinical Medicine, Department Medical Technology, Am Mühlenberg 13, 14476 Potsdam, Germany — 3Weierstraß Institute for Applied Analysis and Stochastics (WIAS), Mohrenstraße 39, 10117 Berlin, Germany — 4Max Planck Institute for Biophysical Chemistry, Am Faßberg 11, 37077 Göttingen, Germany
Electrothermally driven flows in microfluidic channel systems with integrated electrodes currently attract increased interest due to their potential biomedical applications, e.g. for switchable accumulation of viruses. Recently, an elaborate experimental study of the electrothermal pumping reported on the formation of vortices at the edges of the electrode field [1]. The vortices appeared to be quite robust and may hold great promise for applications, e.g. as a tool for the separation, accumulation and analysis of biological micro- and nanoparticles in microdevices, provided their formation can be controlled reliably.
In our talk, we introduce a 3D model for the fluid flow in microchannels extending the model of [2]. The approach uses the relevant electro-, thermo- and hydrodynamic mechanisms and is systematically derived by asymptotic techniques. Finally, the flow is numerically evaluated.
[1] M. Felten et al., Phys. Fluids 2006, 18, 051707.
[2] A. González et al., J. Fluid Mech. 2006, 564, 415-433.