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High performance microfluidic rectifiers for viscoelastic fluid flow

Sousa, P.C. and Pinho, F.T. and Oliveira, Monica and Alves, M.A. (2012) High performance microfluidic rectifiers for viscoelastic fluid flow. RSC Advances, 2 (3). pp. 920-929. ISSN 2046-2069

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Abstract

The flow of Newtonian and non-Newtonian fluids within microfluidic rectifiers with a hyperbolic shape was investigated to assess the effect of the bounding walls on the diodicity of the microfluidic device and achieve high flow anisotropy. Three microchannels were used, with different depths and the same geometrical configuration, which creates a strong extensional flow and generates high anisotropic flow resistance between the two flow directions. The Newtonian fluid, de-ionized water, was used as a reference fluid. The viscoelastic fluid used was an aqueous solution of polyethylene oxide (0.1% w/w) with high molecular weight. The flow patterns were visualized using streak photography and the velocity field was investigated using micro-particle image velocimetry. Moreover, pressure drop measurements were performed in order to compare the diodicity achieved in the microfluidic rectifiers. For the Newtonian fluid flow, the experimental results are compared with numerical predictions obtained using a finite-volume method and good agreement was found between both approaches. For the viscoelastic fluid, significant anisotropic flow resistance can be achieved. The effect of the bounding walls was analysed and found to be qualitatively similar for all microchannels. Nevertheless, in quantitative terms, the diodicity is enhanced when the wall effect is reduced, i.e. when the channels are deeper. A maximum diodicity above six was found for the deeper channel, a value well beyond those previously reported.

Item type: Article
ID code: 41334
Keywords: Newtonian fluid, non-Newtonian fluids, microfluidic rectifiers, viscoelastic flow, velocimetry, Mechanical engineering and machinery, Chemistry, Mechanical Engineering, Mechanics of Materials, Computational Mechanics, Fluid Flow and Transfer Processes
Subjects: Technology > Mechanical engineering and machinery
Science > Chemistry
Department: Faculty of Engineering > Mechanical and Aerospace Engineering
Technology and Innovation Centre > Advanced Engineering and Manufacturing
Depositing user: Pure Administrator
Date Deposited: 03 Oct 2012 12:50
Last modified: 24 Jul 2015 08:19
URI: http://strathprints.strath.ac.uk/id/eprint/41334

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