Please use this identifier to cite or link to this item: https://hdl.handle.net/10216/106747
Author(s): Patrícia C. Sousa
Fernando T. Pinho
Mónica S. N. Oliveira
Manuel A. Alves
Title: High performance microfluidic rectifiers for low inertia flow
Issue Date: 2012
Abstract: The flow of Newtonian and non-Newtonian fluids within microfluidic rectifiers with a hyperbolicshape was investigated to assess the effect of the bounding walls on the diodicity of the microfluidicdevice and achieve high flow anisotropy. Three microchannels were used, with different depths andthe same geometrical configuration, which creates a strong extensional flow and generates highanisotropic 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 polyethyleneoxide (0.1% w/w) with high molecular weight. The flow patterns were visualized using streakphotography and the velocity field was investigated using micro-particle image velocimetry.Moreover, pressure drop measurements were performed in order to compare the diodicity achieved inthe microfluidic rectifiers. For the Newtonian fluid flow, the experimental results are compared withnumerical predictions obtained using a finite-volume method and good agreement was found betweenboth 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 allmicrochannels. Nevertheless, in quantitative terms, the diodicity is enhanced when the wall effect isreduced, i.e. when the channels are deeper. A maximum diodicity above six was found for the deeperchannel, a value well beyond those previously reported
Subject: Ciências da engenharia e tecnologias
Engineering and technology
Scientific areas: Ciências da engenharia e tecnologias
Engineering and technology
URI: https://repositorio-aberto.up.pt/handle/10216/106747
Related Information: info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projectos de I&DT em Todos os Domínios Científicos/PTDC/EQU-FTT/71800/2006/Optimização de microdispositivos para escoamento de fluidos viscoelásticos/OPTIMAL
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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