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Issue 2, 2006
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Paramagnetic particles and mixing in micro-scale flows

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Mixing in microscale flows with rotating chains of paramagnetic particles can be enhanced by adjusting the ratio of viscous to magnetic forces so that chains dynamically break and reform. Lattice Boltzmann (LB) simulations were used to calculate the interaction between the fluid and suspended paramagnetic particles under the influence of a rotating magnetic field. Fluid velocities obtained from the LB simulations are used to solve the advection diffusion equation for massless tracer particles. At relatively high Mason numbers, small chains result in low edge velocities, and hence mixing is slower than at other Mason numbers. At low Mason numbers, long, stable chains form and produce little mixing toward the center of the chains. A peak in mixing rate is observed when chains break and reform. The uniformity of mixing is greater at higher Mason numbers because more small chains result in a larger number of small mixing areas.

Graphical abstract: Paramagnetic particles and mixing in micro-scale flows

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Article information

27 Jun 2005
06 Dec 2005
First published
06 Jan 2006

Lab Chip, 2006,6, 247-257
Article type

Paramagnetic particles and mixing in micro-scale flows

R. Calhoun, A. Yadav, P. Phelan, A. Vuppu, A. Garcia and M. Hayes, Lab Chip, 2006, 6, 247
DOI: 10.1039/B509043A

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