Next Article in Journal
A Viscosity-Based Model for Bubble-Propelled Catalytic Micromotors
Previous Article in Journal
3-Dimensional Plasmonic Substrates Based on Chicken Eggshell Bio-Templates for SERS-Based Bio-Sensing
Article Menu
Issue 7 (July) cover image

Export Article

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

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

1,* , 2
School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
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
View Full-Text   |   Download PDF [1354 KB, uploaded 22 June 2017]   |  


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

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Wang, Q.; Yuan, D.; Li, W. Analysis of Hydrodynamic Mechanism on Particles Focusing in Micro-Channel Flows. Micromachines 2017, 8, 197.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Micromachines EISSN 2072-666X Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top