Abstract
In this work we present an experimental and analytical study of the acoustophoretic motion of spherical polystyrene particles of different sizes. The primary aim is to understand the three-dimensional extension of the acoustic radiation force and the acoustic streaming-induced drag force and to examine the accuracy of analytical force predictions. Polystyrene spheres with diameter of 0.5µm and 5µm were displaced under controlled conditions in a long straight rectangular acoustofluidic microchannel, actuated in its 2-MHz resonance mode, a transverse half-wavelength standing acoustic wave. Astigmatism Particle Tracking Velocimetry (APTV) was used to measure the three-dimensional trajectories, velocities and accelerations of the particles. The experiments show how the acoustic radiation force dominates for the large
5-µm particles, whereas the drag force from the acoustic streaming dominates for the smaller 0.5-µm particles. The experimental 3D data is used to validate new theoretical predictions of the streaming velocity.
5-µm particles, whereas the drag force from the acoustic streaming dominates for the smaller 0.5-µm particles. The experimental 3D data is used to validate new theoretical predictions of the streaming velocity.
Original language | English |
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Title of host publication | Proceedings of the 3rd European Conference on Microfluidics |
Number of pages | 6 |
Publication date | 2012 |
Publication status | Published - 2012 |
Event | 3rd European Conference on Microfluidics - Karlsruhe Institute of Technology, Heidelberg, Germany Duration: 3 Dec 2012 → 5 Dec 2012 Conference number: 3 http://www.microfluidics2012.eu/ |
Conference
Conference | 3rd European Conference on Microfluidics |
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Number | 3 |
Location | Karlsruhe Institute of Technology |
Country | Germany |
City | Heidelberg |
Period | 03/12/2012 → 05/12/2012 |
Internet address |