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Micro-PIV measurements of flows induced by rotating microparticles near a boundary
Journal article   Peer reviewed

Micro-PIV measurements of flows induced by rotating microparticles near a boundary

Jamel Ali, Hoyeon Kim, U. Kei Cheang and Min Jun Kim
Microfluidics and nanofluidics, v 20(9), 131
01 Sep 2016

Abstract

Instruments & Instrumentation Nanoscience & Nanotechnology Physics, Fluids & Plasmas Science & Technology Science & Technology - Other Topics Physical Sciences Physics Technology
We report on the hydrodynamics induced by single-digit micron-sized superparamagnetic particles rotating at low Reynolds number and analyze the resultant flow fields using microparticle image velocimetry (mu PIV). Magnetic microparticles floating a few nanometers above a glass substrate, in an otherwise quiescent fluid, were actuated wirelessly using a rotating magnetic field controlled using two pairs of orthogonally positioned electromagnetic coils. A high-speed camera was used to sufficiently capture the motion of nanometer-sized seeding particles at 500 frames per second as well as track the rotation of microparticles. Data from mu PIV are compared with the analytical solution for Stokes flow generated by a sphere in an infinite fluid and numerical simulations using finite element analysis. Two-dimensional velocity data obtained from stacks of planar flow fields at incremental depths for individual microparticles show non-symmetrical profiles that are an indication of increased viscous effects due to the boundary confining wall. Additionally, the flow fields generated by two particles, at various separation distances, are also analyzed. It is observed that as two synchronously rotating beads, of approximately equal diameter, are placed closed together, complex flows offset, superimpose, and merge into single, larger microvortices. We find that the flow fields generated by two physically bound microparticles, rotating as one unit, are well approximated by the flow generated by a single microparticle with twice the diameter.

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Collaboration types
Domestic collaboration
Web of Science research areas
Instruments & Instrumentation
Nanoscience & Nanotechnology
Physics, Fluids & Plasmas
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