Viscoelastic instabilities in microscale flows

Francisco J Galindo-Rosales, Laura Campo-Deaño, P.C. Sousa, Vera M. Ribeiro, Monica Oliveira, M.A. Alves, F.T. Pinho

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Many artificial and natural fluids contain macromolecules, particles or droplets that impart complex flow behavior to the fluid. This complex behavior results in a non-linear relationship between stress and deformation standing in between Newton’s law of viscosity for an ideal viscous liquid and Hooke’s law for an ideal elastic material. Such non-linear viscoelastic behavior breaks down flow reversibility under creeping flow conditions, as encountered at the micro-scale, and can lead to flow instabilities. These instabilities offer an alternative to the development of systems requiring unstable flows under conditions where chaotic advection is unfeasible. Flows of viscoelastic fluids are characterized by the Weissenberg (Wi) and Reynolds (Re) numbers, and at the micro-scale flow instabilities occur in regions in the Wi–Re space typically unreachable at the macro-scale, namely high Wi and low Re. In this paper, we review recent experimental work by the authors on the topic of elastic instabilities in flows having a strong extensional component, including: flow through a hyperbolic contraction followed by a sudden expansion; flow in a microfluidic diode and in a flow focusing device; flow around a confined cylinder; flow through porous media and simplified porous media analogs. These flows exhibit different types of flow transitions depending on geometry, Wi and Re, including: transition from a steady symmetric to a steady asymmetric flow, often followed by a second transition to unsteady flow at high Wi; direct transition between steady symmetric and unsteady flows.
LanguageEnglish
Pages128-139
Number of pages12
JournalExperimental Thermal and Fluid Science
Early online date18 Mar 2014
DOIs
Publication statusPublished - Nov 2014

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Unsteady flow
Porous materials
Transition flow
Fluids
Advection
Steady flow
Macromolecules
Microfluidics
Macros
Flow of fluids
Diodes
Reynolds number
Viscosity
Geometry
Liquids

Keywords

  • viscoelasticity
  • elastic instabilities
  • microfluidics

Cite this

Galindo-Rosales, F. J., Campo-Deaño, L., Sousa, P. C., Ribeiro, V. M., Oliveira, M., Alves, M. A., & Pinho, F. T. (2014). Viscoelastic instabilities in microscale flows. Experimental Thermal and Fluid Science, 128-139. https://doi.org/10.1016/j.expthermflusci.2014.03.004
Galindo-Rosales, Francisco J ; Campo-Deaño, Laura ; Sousa, P.C. ; Ribeiro, Vera M. ; Oliveira, Monica ; Alves, M.A. ; Pinho, F.T. / Viscoelastic instabilities in microscale flows. In: Experimental Thermal and Fluid Science. 2014 ; pp. 128-139.
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Galindo-Rosales, FJ, Campo-Deaño, L, Sousa, PC, Ribeiro, VM, Oliveira, M, Alves, MA & Pinho, FT 2014, 'Viscoelastic instabilities in microscale flows' Experimental Thermal and Fluid Science, pp. 128-139. https://doi.org/10.1016/j.expthermflusci.2014.03.004

Viscoelastic instabilities in microscale flows. / Galindo-Rosales, Francisco J; Campo-Deaño, Laura; Sousa, P.C.; Ribeiro, Vera M.; Oliveira, Monica; Alves, M.A.; Pinho, F.T.

In: Experimental Thermal and Fluid Science, 11.2014, p. 128-139.

Research output: Contribution to journalArticle

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