Effects of aspect ratio and gravity level on opposed bubbly jets
Numerical simulations of bubbly flows in an opposed-jet configuration have been carried out in a two-dimensional domain. The effects of aspect ratio and gravity level on the resulting flow have been considered. Reynolds number ranges from Re = 100 up to Re = 2000, while the separation between nozzle...
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| Tipo de documento: | relatório científico |
| Data de publicação: | 2010 |
| País: | España |
| Recursos: | Universitat Politècnica de Catalunya (UPC) |
| Repositório: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglês |
| OAI Identifier: | oai:upcommons.upc.edu:2117/439499 |
| Acesso em linha: | https://hdl.handle.net/2117/439499 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Fluid dynamics Bubbles Dinàmica de fluids Bombolles Àrees temàtiques de la UPC::Física::Física de fluids |
| Resumo: | Numerical simulations of bubbly flows in an opposed-jet configuration have been carried out in a two-dimensional domain. The effects of aspect ratio and gravity level on the resulting flow have been considered. Reynolds number ranges from Re = 100 up to Re = 2000, while the separation between nozzles ranges from 10 up to 50 nozzle diameters. Simulations have been carried out at two different gravity levels, corresponding to Fr = 1 and Fr ¿ 8 (zero gravity). Bubbly jets evolve in time until they collide at the central zone. In the zero gravity case, two vertically-emerging jets are created after the collision, maintaining a symmetric flow with respect to the injection direction and the perpendicular. However, this symmetry is broken in the non-zero gravity case due to buoyancy forces. For the Fr = 1 case, a rising bubbly plume is created. Velocity field and phase volume fraction distribution have been obtained for both phases, and will be compared to experimental results. |
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