Extensional flows of polymer solutions in microfluidic converging/diverging geometries

G.H. McKinley; Lucy E. Rodd; Monica Oliveira; J.J. Cooper-White

doi:10.1007/s11771-007-0202-1

Extensional flows of polymer solutions in microfluidic converging/diverging geometries

G.H. McKinley, Lucy E. Rodd, Monica Oliveira, J.J. Cooper-White

Mechanical And Aerospace Engineering

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)

Abstract

The effects of fluid elasticity in the flow of non-Newtonian fluids in microfluidic converging/diverging geometries are investigated. We investigate the structure and dynamics of inertio-elastic flow instabilities and elastic corner vortices which develop upstream of the contraction plane, and explore their dependence on the relative magnitudes of inertia and elastic stress generated by the high deformation rates in the contraction geometry. The results show that the shape, size and evolution of these flow structures varies with the elasticity number, which is independent of the flow kinematics and is only dependent on fluid properties (viscosity, density and polymer relaxation time) and the characteristic size of the channel.

Original language	English
Pages (from-to)	6
Journal	Journal of the Central South University of Technology
Volume	14
Issue number	1-Supplement
DOIs	https://doi.org/10.1007/s11771-007-0202-1
Publication status	Published - Feb 2007

Keywords

extensional flow
polymer solutions
converging flow
diverging flow

Access to Document

10.1007/s11771-007-0202-1

http://link.springer.com/article/10.1007/s11771-007-0202-1

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title = "Extensional flows of polymer solutions in microfluidic converging/diverging geometries",

abstract = "The effects of fluid elasticity in the flow of non-Newtonian fluids in microfluidic converging/diverging geometries are investigated. We investigate the structure and dynamics of inertio-elastic flow instabilities and elastic corner vortices which develop upstream of the contraction plane, and explore their dependence on the relative magnitudes of inertia and elastic stress generated by the high deformation rates in the contraction geometry. The results show that the shape, size and evolution of these flow structures varies with the elasticity number, which is independent of the flow kinematics and is only dependent on fluid properties (viscosity, density and polymer relaxation time) and the characteristic size of the channel.",

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author = "G.H. McKinley and Rodd, {Lucy E.} and Monica Oliveira and J.J. Cooper-White",

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T1 - Extensional flows of polymer solutions in microfluidic converging/diverging geometries

AU - McKinley, G.H.

AU - Rodd, Lucy E.

AU - Oliveira, Monica

AU - Cooper-White , J.J.

PY - 2007/2

Y1 - 2007/2

N2 - The effects of fluid elasticity in the flow of non-Newtonian fluids in microfluidic converging/diverging geometries are investigated. We investigate the structure and dynamics of inertio-elastic flow instabilities and elastic corner vortices which develop upstream of the contraction plane, and explore their dependence on the relative magnitudes of inertia and elastic stress generated by the high deformation rates in the contraction geometry. The results show that the shape, size and evolution of these flow structures varies with the elasticity number, which is independent of the flow kinematics and is only dependent on fluid properties (viscosity, density and polymer relaxation time) and the characteristic size of the channel.

AB - The effects of fluid elasticity in the flow of non-Newtonian fluids in microfluidic converging/diverging geometries are investigated. We investigate the structure and dynamics of inertio-elastic flow instabilities and elastic corner vortices which develop upstream of the contraction plane, and explore their dependence on the relative magnitudes of inertia and elastic stress generated by the high deformation rates in the contraction geometry. The results show that the shape, size and evolution of these flow structures varies with the elasticity number, which is independent of the flow kinematics and is only dependent on fluid properties (viscosity, density and polymer relaxation time) and the characteristic size of the channel.

KW - extensional flow

KW - polymer solutions

KW - converging flow

KW - diverging flow

UR - http://link.springer.com/article/10.1007/s11771-007-0202-1

U2 - 10.1007/s11771-007-0202-1

DO - 10.1007/s11771-007-0202-1

M3 - Article

VL - 14

SP - 6

JO - Journal of Central South University of Technology

JF - Journal of Central South University of Technology

SN - 1005-9784

IS - 1-Supplement

ER -