Frequency effects on microparticle motion in horizontally actuated open rectangular chambers

作者: Prashant Agrawal , Prasanna S. Gandhi , Adrian Neild

DOI: 10.1007/S10404-015-1640-Y

关键词: OpticsMechanicsParticle sizeAcoustic streamingAcoustic waveParticleExcitationVibrationPhysicsCapillary waveField (physics)

摘要: The motion of a particle in liquid subjected to periodic vibrations is determined by its interaction with the (in time) and spatially varying first-order flow field ensuing second-order field. dominating force either allows collect stable locations or remain dispersed bulk. In this work, we investigate characteristics microparticle’s response these first- effects across frequencies ranging from 100 Hz MHz. movement sedimented particles analyzed through simulation capillary wave fields acoustic horizontally actuated open rectangular chamber. changing effect on particle’s motion, being dominant mechanism at low ineffective higher frequencies, demonstrated considering time-averaged forces acting particle, over cycle. Further, field, termed as streaming are both capillary-wave- acoustic-wave-based collection mechanisms; analysis provides valuable information regarding minimum size that can be collected chamber, respective mechanisms. Intriguingly, it observed nanometer-sized requires excitation end frequency spectrum.

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