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Concentration profiles of ions and particles under hydrodynamic focusing in Y-shaped square microchannel.

Abstract：

:Three-dimensional ion and particle concentrations under hydrodynamic focusing in a Y-shaped square microchannel are numerically simulated to clarify the decrease of the ion concentration along the flow direction within the focused particle stream. The simulation model is theoretically governed by the laminar flow and advection-diffusion equations. The governing equations are solved by the finite volume method. The ion and particle concentration distributions at five cross sections after the confluence of the branch channels are analyzed in 30 cases in which the sheath to sample flow rate ratio Qsh/Qsam and the Reynolds number Re are varied as parameters. The results show that the decrease of the cross-sectional average ion concentration along the flow direction within the particle stream [Formula: see text] is described by the diffusion length during the residence time with a characteristic velocity scale. In addition, the deformation of the particle stream due to inertial effects is described by a scaled Reynolds number that is a function of the flow rate ratio. The simulated particle stream thicknesses are validated by theory and a simple experiment. This paper reveals the relationship between the ion and particle concentrations and the dimensionless parameters for hydrodynamic focusing in the Y-shaped square microchannel under typical conditions.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Sato N,Kawashima D,Takei M

doi

10.1038/s41598-021-82259-4

subject

Has Abstract

pub_date

2021-01-28 00:00:00

pages

2585

issue

1

issn

2045-2322

pii

10.1038/s41598-021-82259-4

journal_volume

11

pub_type

杂志文章

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