Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.6/594
Título: Visualizations of Boger fluid flows in a 4:1 square/square contraction
Autor: Alves, Maria Arminda Costa.
Pinho, Fernando Tavares de
Oliveira, Paulo Jorge dos Santos Pimentel de
Palavras-chave: Viscoelastic flow
Boger fluid
Diverging flow
Visualization
3D contraction flow
Data: 28-Abr-2010
Resumo: Visualizations of the 3-D flow in a 4:1 square/square sudden contraction for two viscoelastic Boger fluids and two Newtonian fluids were carried out at low Reynolds numbers. In these creeping flow conditions, the vortex length remained unchanged for Newtonian fluids, whereas a nonmonotonic variation with flow rate was observed for the Boger fluids. Initially, the corner vortex slightly increased with flow rate to a local peak at a Deborah number of De=6, before decreasing significantly to a minimum at De=15 (De is based on downstream characteristics). Finally, for Deborah numbers = 20 there was intense vortex enhancement until a periodic flow was established at higher flow rates (De=45/ 52). The strong elastic vortex enhancement was preceded by the appearance of diverging streamlines on the approach flow and, for the Boger fluid with higher polymer concentration, vortex enhancement took place through a lip vortex mechanism.
URI: http://hdl.handle.net/10400.6/594
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