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On the polydisperse particle migration and formation of chains in a square channel flow of non-Newtonian fluids

Published online by Cambridge University Press:  08 February 2022

Xiao Hu Open the ORCID record for Xiao Hu [Opens in a new window] ,
Peifeng Lin Open the ORCID record for Peifeng Lin [Opens in a new window] ,
Jianzhong Lin Open the ORCID record for Jianzhong Lin [Opens in a new window] ,
Zuchao Zhu  and
Zhaosheng Yu Open the ORCID record for Zhaosheng Yu [Opens in a new window]
Xiao Hu
Affiliation:
Key Laboratory of Fluid Transmission Technology of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, PR China Department of Mechanics, State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou, Zhejiang 310027, PR China
Peifeng Lin
Affiliation:
Key Laboratory of Fluid Transmission Technology of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, PR China
Jianzhong Lin*
Affiliation:
Department of Mechanics, State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou, Zhejiang 310027, PR China Faculty of Mechanical Engineering and & Mechanics, Ningbo University, Ningbo, Zhejiang 315201, PR China
Zuchao Zhu
Affiliation:
Key Laboratory of Fluid Transmission Technology of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, PR China
Zhaosheng Yu
Affiliation:
Department of Mechanics, State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou, Zhejiang 310027, PR China
*
†Email address for correspondence: [email protected]
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Abstract

The migration of polydisperse particles and the formation of self-organized particle chains in a square channel flow of non-Newtonian fluids is studied. The effects of rheological behaviour of the fluid, solution concentration and flow rate are explored experimentally. The direct forcing/fictitious domain method is adopted to qualitatively verify the experiments and further analyse the mechanisms of particle migration and particle chain self-organization. The results show that only particles in viscoelastic fluids with negligible shear-thinning effect will remain at the channel centreline as the flow rate increases. The monodisperse particles reach the same velocity when migrating to the equilibrium position. However, in polydisperse suspensions, the smaller the particle diameter, the greater the velocity when the particle migrates to the equilibrium position. In a viscoelastic fluid, the polydisperse particles are more likely to self-organize into long particle chains along the channel centreline than the monodisperse particles, where the large and small particles are at the front and end of the chain. The dimensionless alignment factor (Af) is adopted to quantify the formation of particle chains, which is the largest in viscoelastic fluids and rapidly increases before decreasing to a stable value as the flow rate increases. For larger particle diameter ratios and stronger shear-thinning effect, the long particle chain self-organization is less obvious. The self-organizing particle chains at the channel centreline are strongly influenced by the fluid elastic properties and weakly by the inertial effect; however, the shear-thinning effect disperses the particles and prevents the formation of long straight particle chains.

JFM classification

Non-Newtonian Flows: Viscoelasticity Micro-/Nano-fluid dynamics: Microfluidics
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 936 , 10 April 2022 , A5
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Copyright
© The Author(s), 2022. Published by Cambridge University Press

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Supplementary material: File

Hu et al. supplementary movie 1

Numerical result of particle migration and chain self-organization.

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Supplementary material: File

Hu et al. supplementary movie 2

Particle migration and chain self-organization in PVP solution with Q=40μl/min.

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Supplementary material: File

Hu et al. supplementary movie 3

Particle migration and chain self-organization in PEO solution with Q=40μl/min.

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File 2.3 MB
Supplementary material: File

Hu et al. supplementary movie 4

Particle migration and chain self-organization in HA solution with Q=40μl/min.

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File 3.6 MB
Supplementary material: File

Hu et al. supplementary movie 5

Particle migration and chain self-organization in PVP solution with Q=300μl/min.

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File 3.9 MB
Supplementary material: File

Hu et al. supplementary movie 6

Particle migration and chain self-organization in PEO solution with Q=300μl/min.

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File 3.3 MB
Supplementary material: File

Hu et al. supplementary movie 7

Particle migration and chain self-organization in HA solution with Q=300μl/min.

Download Hu et al. supplementary movie 7(File)
File 4 MB