Artículo
Three-dimensional flow structures in X-shaped junctions: Effect of the Reynolds number and crossing angle
Correa, Pablo Germán
; Mac Intyre, Jonatan Raúl
; Gomba, Juan Manuel
; Cachile, Mario Andres
; Hulin, Jean-Pierre; Auradou, Harold
Fecha de publicación:
23/04/2019
Editorial:
American Institute of Physics
Revista:
Physics of Fluids
ISSN:
1070-6631
e-ISSN:
1089-7666
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We study numerically the three-dimensional (3D) dynamics of two facing flows in an X-shaped junction of two circular channels crossing at an angle α. The distribution of the fluids in the junction and in the outlet channels is determined as a function of α and the Reynolds number Re. Our goal is to describe the different flow regimes in the junction and their dependence on α and Re. We also explore to which extent two-dimensional (2D) simulations are able to describe the flow within a 3D geometry. In the 3D case, at large Re?s (≳50) and α?s (≳60°), axial vorticity (i.e., parallel to the outlet axis) of magnitude increasing both with α and Re develops in the outlet channels and cannot be reproduced by 2D numerical simulations. At lower angles (α ≲ 60°), instead, a mean vorticity component perpendicular to the junction plane is present: both its magnitude and the number of the corresponding vortices (i.e., recirculation zones) increase as α decreases. These vortices appear in both 2D and 3D simulations but at different threshold values of α and Re. At very low Re?s (≲5) and α?s (∼15°), the flow structure in 3D simulations is nearly 2D but its quantitative characteristics differ from 2D simulations. As Re increases, this two-dimensionality disappears, while vortices due to flow separation appear in the outlet channels.
Palabras clave:
X-JUNCTIONS
,
VORTEX
,
FLOW PATTERNS
,
STABILITY
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Articulos(CIFICEN)
Articulos de CENTRO DE INV. EN FISICA E INGENIERIA DEL CENTRO DE LA PCIA. DE BS. AS.
Articulos de CENTRO DE INV. EN FISICA E INGENIERIA DEL CENTRO DE LA PCIA. DE BS. AS.
Citación
Correa, Pablo Germán; Mac Intyre, Jonatan Raúl; Gomba, Juan Manuel; Cachile, Mario Andres; Hulin, Jean-Pierre; et al.; Three-dimensional flow structures in X-shaped junctions: Effect of the Reynolds number and crossing angle; American Institute of Physics; Physics of Fluids; 31; 4; 23-4-2019; 1-13
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