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 language | English |
---|---|
Pages (from-to) | 683-692 |
Number of pages | 10 |
Journal | Microfluidics and Nanofluidics |
Volume | 17 |
Issue number | 4 |
DOIs | |
Publication status | Published - 2014 Oct |
Bibliographical note
Funding Information:Acknowledgments This research was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MEST) (No. 2009-0080636). This research was also supported by the Nano-Material Technology Development Program (Green Nano Technology Development Program) of the NRF funded by the Ministry of Education, Science and Technology of Korea (No. 2011-0020090).
Publisher Copyright:
© 2014, Springer-Verlag Berlin Heidelberg.
Keywords
- Microfluidics
- Normal stress
- Particle separation
- Secondary flow
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Materials Chemistry