Viscoelastic Particle Focusing and Separation in a Spiral Channel

Overview

Journal Micromachines (Basel)

Publisher MDPI

Date 2022 Mar 26

PMID 35334653

Authors

Haidong Feng

Alexander R Jafek

Bonan Wang

Hayden Brady

Jules J Magda

Bruce K Gale

Affiliations

Soon will be listed here.

Abstract

As one type of non-Newtonian fluid, viscoelastic fluids exhibit unique properties that contribute to particle lateral migration in confined microfluidic channels, leading to opportunities for particle manipulation and separation. In this paper, particle focusing in viscoelastic flow is studied in a wide range of polyethylene glycol (PEO) concentrations in aqueous solutions. Polystyrene beads with diameters from 3 to 20 μm are tested, and the variation of particle focusing position is explained by the coeffects of inertial flow, viscoelastic flow, and Dean flow. We showed that particle focusing position can be predicted by analyzing the force balance in the microchannel, and that particle separation resolution can be improved in viscoelastic flows.

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