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Inertial forces for particle manipulation near oscillating interfaces

Siddhansh Agarwal1, Bhargav Rallabandi2,*, and Sascha Hilgenfeldt1,†

  • 1Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
  • 2Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544, USA

  • *Current affiliation: Department of Mechanical Engineering, University of California Riverside, Riverside, California 92521, USA.
  • †sascha@illinois.edu
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Phys. Rev. Fluids 3, 104201 – Published 4 October, 2018

DOI: https://doi.org/10.1103/PhysRevFluids.3.104201

Abstract

Due to the inherent nonlinearity of fluid dynamics, a large class of oscillating flows gives rise to rectified effects of steady motion. It has recently been shown that particle transport in such flows leads to differential displacement and efficient sorting of microparticles. Here we present a model that generalizes a Maxey-Riley-like equation for particle motion, incorporating important viscous and inviscid effects near oscillating interfaces and efficiently bridging the acoustofluidic and microfluidic approaches. Resulting in direct predictions for particle motion on slower timescales, the model predicts a richer and qualitatively different behavior from that expected from simplified radiation-force formalisms: depending on experimental control parameters, the net effect of interfacial oscillation can be either an attraction to or a repulsion from the interface, and particles can be captured at a fixed distance or released. These results are verified in comparison with experiments.

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Phys. Rev. Fluids 3, 104201– Published 4 October, 2018
  • Received 28 April 2018
Article part of CHORUS
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