Lateral migration of particles suspended in viscoelastic fluids in a microchannel flow

Hyunjung Lim, Jeonghun Nam, Sehyun Shin

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26 Citations (Scopus)

Abstract

In this work, we investigated the lateral migration of microparticles suspended in two different viscoelastic fluids with or without the second normal stress difference. For the viscoelastic fluid without the second normal stress difference, competing forces existed between microfluidic inertia and the first normal stress difference (N1), which resulted in a synergetic effect of particle focusing. For the fluid with the second normal stress difference (N2), particles were greatly affected by a N2-induced secondary flow, and the competition among the inertia, N1, and N2 determined the lateral migration trajectories of the particles. The obtained results were delineated with the blockage ratio, which showed good agreement with the results of a recent numerical study (Villone et al. in J Non Newton Fluid Mech 195:1–8, 2013). The present study also examined the possibility of particle separation in a size-dependent manner using the N2-induced secondary flow in microchannel flow.

Original languageEnglish
Pages (from-to)683-692
Number of pages10
JournalMicrofluidics and Nanofluidics
Volume17
Issue number4
DOIs
Publication statusPublished - 2014 Jan 1

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ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry

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