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Author(s): Simon J. Haward
Robert J. Poole
Manuel A. Alves
Paulo J. Oliveira
Nigel Goldenfeld
Amy Q. Shen
Title: Tricritical spiral vortex instability in cross-slot flow
Issue Date: 2016
Abstract: We examine fluid flow through cross-slot devices with various depth to width ratios alpha. At low Reynolds number, R-e, flow is symmetric and a sharp boundary exists between the two incoming fluid streams. Above an alpha-dependent critical value, Re-c(alpha), a steady symmetry-breaking bifurcation occurs and a spiral vortex structure develops. Order parameters characterizing the instability grow according to a sixth-order Landau potential, and show a progression from second- to first-order transitions as alpha increases beyond a tricritical value of alpha approximate to 0.55. Flow simulations indicate the instability is driven by vortex stretching at the stagnation point.
Related Information: info:eu-repo/grantAgreement/COMISSÃO EUROPEIA/7.º Programa-Quadro de IDT/307499/Purely-elastic flow instabilities and transition to elastic turbulence in microscale flows of complex fluids/Elastic-Turbulence
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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