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Author(s): Robert J. Poole
Manuel A. Alves
Alexandre P. Afonso
Fernando T. Pinho
Paulo J. Oliveira
Title: Purely-elastic flow instabilities in a microfluidic cross-slot geometry
Issue Date: 2007
Abstract: In this work we demonstrate numerically, using a 3D finite-volume method, that viscoelastic flow in a microfluidic cross-slot geometry can lead to flow asymmetries under perfectly symmetric flow conditions. This supercritical instability is predicted using the upper-convected Maxwell model under creeping flow conditions, thus demonstrating that it is purely elastic in nature. The numerical results obtained agree qualitatively with the recent experimental findings of Arratia et al.[1]. We investigate the effect of the aspect ratio of the geometry, showing the stabilizing effect of the upper and lower walls. In the limit of small depth a Hele-Shaw flow is approached and the onset of asymmetric flow is suppressed. On the other hand, the elastic instability that leads to a periodic flow occurs at increasingly smaller Deborah numbers as the aspect ratio decreases.
Source: AIChE Annual Meeting, Conference Proceedings
Document Type: Artigo em Livro de Atas de Conferência Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Livro de Atas de Conferência Internacional

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