Three-Dimensional Numerical Simulation of Particle Focusing and Separation in Viscoelastic Fluids
Particle focusing and separation using viscoelastic microfluidic technology have attracted lots of attention in many applications. In this paper, a three-dimensional lattice Boltzmann method (LBM) coupled with the immersed boundary method (IBM) is employed to study the focusing and separation of par...
Main Authors: | , |
---|---|
Format: | Article |
Language: | English |
Published: |
MDPI AG
2020-09-01
|
Series: | Micromachines |
Subjects: | |
Online Access: | https://www.mdpi.com/2072-666X/11/10/908 |
id |
doaj-493be891be1346b797609a7ff77b5183 |
---|---|
record_format |
Article |
spelling |
doaj-493be891be1346b797609a7ff77b51832020-11-25T03:39:55ZengMDPI AGMicromachines2072-666X2020-09-011190890810.3390/mi11100908Three-Dimensional Numerical Simulation of Particle Focusing and Separation in Viscoelastic FluidsChen Ni0Di Jiang1School of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing 210037, ChinaSchool of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing 210037, ChinaParticle focusing and separation using viscoelastic microfluidic technology have attracted lots of attention in many applications. In this paper, a three-dimensional lattice Boltzmann method (LBM) coupled with the immersed boundary method (IBM) is employed to study the focusing and separation of particles in viscoelastic fluid. In this method, the viscoelastic fluid is simulated by the LBM with two sets of distribution functions and the fluid–particle interaction is calculated by the IBM. The performance of particle focusing under different microchannel aspect ratios (AR) is explored and the focusing equilibrium positions of the particles with various elasticity numbers and particle diameters are compared to illustrate the mechanism of particle focusing and separation in viscoelastic fluids. The results indicate that, for particle focusing in the square channel (AR = 1), the centerline single focusing becomes a bistable focusing at the centerline and corners as <i>El</i> increases. In the rectangular channels (AR < 1), particles with different diameters have different equilibrium positions. The equilibrium position of large particles is closer to the wall, and large particles have a faster lateral migration speed and few large particles migrate towards the channel center. Compared with the square channel, the rectangular channel is a better design for particle separation.https://www.mdpi.com/2072-666X/11/10/908lattice Boltzmann methodparticle focusingparticle separationviscoelastic fluidaspect ratios |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Chen Ni Di Jiang |
spellingShingle |
Chen Ni Di Jiang Three-Dimensional Numerical Simulation of Particle Focusing and Separation in Viscoelastic Fluids Micromachines lattice Boltzmann method particle focusing particle separation viscoelastic fluid aspect ratios |
author_facet |
Chen Ni Di Jiang |
author_sort |
Chen Ni |
title |
Three-Dimensional Numerical Simulation of Particle Focusing and Separation in Viscoelastic Fluids |
title_short |
Three-Dimensional Numerical Simulation of Particle Focusing and Separation in Viscoelastic Fluids |
title_full |
Three-Dimensional Numerical Simulation of Particle Focusing and Separation in Viscoelastic Fluids |
title_fullStr |
Three-Dimensional Numerical Simulation of Particle Focusing and Separation in Viscoelastic Fluids |
title_full_unstemmed |
Three-Dimensional Numerical Simulation of Particle Focusing and Separation in Viscoelastic Fluids |
title_sort |
three-dimensional numerical simulation of particle focusing and separation in viscoelastic fluids |
publisher |
MDPI AG |
series |
Micromachines |
issn |
2072-666X |
publishDate |
2020-09-01 |
description |
Particle focusing and separation using viscoelastic microfluidic technology have attracted lots of attention in many applications. In this paper, a three-dimensional lattice Boltzmann method (LBM) coupled with the immersed boundary method (IBM) is employed to study the focusing and separation of particles in viscoelastic fluid. In this method, the viscoelastic fluid is simulated by the LBM with two sets of distribution functions and the fluid–particle interaction is calculated by the IBM. The performance of particle focusing under different microchannel aspect ratios (AR) is explored and the focusing equilibrium positions of the particles with various elasticity numbers and particle diameters are compared to illustrate the mechanism of particle focusing and separation in viscoelastic fluids. The results indicate that, for particle focusing in the square channel (AR = 1), the centerline single focusing becomes a bistable focusing at the centerline and corners as <i>El</i> increases. In the rectangular channels (AR < 1), particles with different diameters have different equilibrium positions. The equilibrium position of large particles is closer to the wall, and large particles have a faster lateral migration speed and few large particles migrate towards the channel center. Compared with the square channel, the rectangular channel is a better design for particle separation. |
topic |
lattice Boltzmann method particle focusing particle separation viscoelastic fluid aspect ratios |
url |
https://www.mdpi.com/2072-666X/11/10/908 |
work_keys_str_mv |
AT chenni threedimensionalnumericalsimulationofparticlefocusingandseparationinviscoelasticfluids AT dijiang threedimensionalnumericalsimulationofparticlefocusingandseparationinviscoelasticfluids |
_version_ |
1724537686047326208 |