Please use this identifier to cite or link to this item:
https://hdl.handle.net/10216/105879
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. |
URI: | https://hdl.handle.net/10216/105879 |
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 |
Files in This Item:
File | Description | Size | Format | |
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202425.pdf Restricted Access | Artigo Original Publicado | 3.28 MB | Adobe PDF | Request a copy from the Author(s) |
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