Experimental and analytical characterization of the 3D motion of particles in acoustofluidic devices

Research output: Research - peer-reviewArticle in proceedings – Annual report year: 2012

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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.
Original languageEnglish
Title of host publicationProceedings of the 3rd European Conference on Microfluidics
Number of pages6
Publication date2012
StatePublished - 2012
Event3rd European Conference on Microfluidics - Karlsruhe Institute of Technology, Heidelberg, Germany
Duration: 3 Dec 20125 Dec 2012
Conference number: 3


Conference3rd European Conference on Microfluidics
LocationKarlsruhe Institute of Technology
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ID: 97950104