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Micromachines 2017, 8(7), 197; doi:10.3390/mi8070197

Analysis of Hydrodynamic Mechanism on Particles Focusing in Micro-Channel Flows

1,* , 2
and
2,*
1
School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
2
School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, Wollongong NSW 2522, Australia
*
Authors to whom correspondence should be addressed.
Received: 5 May 2017 / Revised: 15 June 2017 / Accepted: 19 June 2017 / Published: 22 June 2017
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Abstract

In this paper, the hydrodynamic mechanism of moving particles in laminar micro-channel flows was numerically investigated. A hydrodynamic criterion was proposed to determine whether particles in channel flows can form a focusing pattern or not. A simple formula was derived to demonstrate how the focusing position varies with Reynolds number and particle size. Based on this proposed criterion, a possible hydrodynamic mechanism was discussed as to why the particles would not be focused if their sizes were too small or the channel Reynolds number was too low. The Re-λ curve (Re, λ respectively represents the channel-based Reynolds number and the particle’s diameter scaled by the channel) was obtained using the data fitting with a least square method so as to obtain a parameter range of the focusing pattern. In addition, the importance of the particle rotation to the numerical modeling for the focusing of particles was discussed in view of the hydrodynamics. This research is expected to deepen the understanding of the particle transport phenomena in bounded flow, either in micro or macro fluidic scope. View Full-Text
Keywords: inertial lift force; inertial focusing of particles; laminar channel flow; numerical investigation inertial lift force; inertial focusing of particles; laminar channel flow; numerical investigation
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Wang, Q.; Yuan, D.; Li, W. Analysis of Hydrodynamic Mechanism on Particles Focusing in Micro-Channel Flows. Micromachines 2017, 8, 197.

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