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Size-dependent particle migration and trapping in three-dimensional microbubble streaming flows

Andreas Volk1, Massimiliano Rossi1,2, Bhargav Rallabandi3, Christian J. Kähler1, Sascha Hilgenfeldt4, and Alvaro Marin5,*

  • 1Institute of Fluid Mechanics and Aerodynamics, Bundeswehr University Munich, 85577 Neubiberg, Germany
  • 2Department of Physics, Technical University of Denmark, DTU Physics Building 309, DK-2800 Kongens Lyngby, Denmark
  • 3Department of Mechanical Engineering, University of California, Riverside, California 92521, USA
  • 4Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
  • 5Physics of Fluids, University of Twente, 7522NB Enschede, The Netherlands

  • *a.marin@utwente.nl
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Phys. Rev. Fluids 5, 114201 – Published 19 November, 2020

DOI: https://doi.org/10.1103/PhysRevFluids.5.114201

Abstract

Acoustically actuated sessile bubbles can be used as a tool to manipulate microparticles, vesicles, and cells. In this work, using acoustically actuated sessile semicylindrical microbubbles, we demonstrate experimentally that finite-sized microparticles undergo size-sensitive migration and trapping toward specific spatial positions in three dimensions with high reproducibility. The particle trajectories are successfully reproduced by passive advection of the particles in a steady three-dimensional streaming flow field augmented with volume exclusion from the confining boundaries. For different particle sizes, this volume exclusion mechanism leads to three regimes of qualitatively different migratory behavior, suggesting applications for separating, trapping, and sorting of particles in three dimensions.

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References (39)

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Phys. Rev. Fluids 5, 114201– Published 19 November, 2020
  • Received 23 June 2020
  • Accepted 27 October 2020
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