Numerical Study and Geometric Investigation of the Influence of Rectangular Baffles over the Mixture of Turbulent Flows into Stirred Tanks
The present work aims to define strategies for numerical simulation of the mixture of turbulent flows in a stirred tank with a low computational effort, and to investigate the influence of the geometry of four rectangular baffles on the problem of performance. Two computational models based on momen...
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MDPI AG
2022-05-01
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| author | Laísa Luiz Soares Cesare Biserni Roger da Rosa Costa João Américo Aguirre Oliveira Júnior Elizaldo Domingues dos Santos Marcelo Moraes Galarça |
| author_facet | Laísa Luiz Soares Cesare Biserni Roger da Rosa Costa João Américo Aguirre Oliveira Júnior Elizaldo Domingues dos Santos Marcelo Moraes Galarça |
| author_sort | Laísa Luiz Soares |
| collection | DOAJ |
| description | The present work aims to define strategies for numerical simulation of the mixture of turbulent flows in a stirred tank with a low computational effort, and to investigate the influence of the geometry of four rectangular baffles on the problem of performance. Two computational models based on momentum source and sliding mesh are validated by comparison with experimental results from the literature. For both models, the time-averaged conservation equations of mass, momentum and transport of the mixture are solved using the finite volume method (FVM) (FLUENT<sup>®</sup> v.14.5). The standard <i>k</i>–<i>ε</i> model is used for closure of turbulence. Concerning the geometrical investigation, constructal design is employed to define the search space, degrees of freedom and performance indicators of the problem. More precisely, seven configurations with different width/length (<i>L</i>/<i>B</i>) ratios for the rectangular baffles are studied and compared with an unbaffled case. The momentum source model leads to valid results and significantly reduces the computational effort in comparison with the sliding mesh model. Concerning the design, the results indicate that the case without baffles creates the highest magnitude of turbulence kinetic energy, but poorly distributes it along the domain. The best configuration, (<i>L</i>/<i>B</i>)<sub>o</sub> = 1.0, leads to a mixture performance nearly two times superior than the case without baffles. |
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| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T03:25:01Z |
| publishDate | 2022-05-01 |
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| series | Applied Sciences |
| spelling | doaj.art-0b50a5ffe45345f98cec25dfac68d28e2023-11-23T09:53:45ZengMDPI AGApplied Sciences2076-34172022-05-011210482710.3390/app12104827Numerical Study and Geometric Investigation of the Influence of Rectangular Baffles over the Mixture of Turbulent Flows into Stirred TanksLaísa Luiz Soares0Cesare Biserni1Roger da Rosa Costa2João Américo Aguirre Oliveira Júnior3Elizaldo Domingues dos Santos4Marcelo Moraes Galarça5Graduate Program in Computational Modeling, Federal University of Rio Grande—FURG, Itália Av., km 8, Rio Grande 96203-900, RS, BrazilDepartment of Industrial Engineering, Alma Mater Studiorum, University of Bologna, Viale Risorgimento 2, 40136 Bologna, ItalyFederal Institute of Education, Science and Technology of Rio Grande do Sul—IFRS, Alfredo Huch Engineer Street, 475, Rio Grande 96201-900, RS, BrazilEngineering Simulation and Scientific Software Ltd., Orlando Phillipi St., 100, Florianópolis 88032-700, SC, BrazilGraduate Program in Computational Modeling, Federal University of Rio Grande—FURG, Itália Av., km 8, Rio Grande 96203-900, RS, BrazilGraduate Program in Computational Modeling, Federal University of Rio Grande—FURG, Itália Av., km 8, Rio Grande 96203-900, RS, BrazilThe present work aims to define strategies for numerical simulation of the mixture of turbulent flows in a stirred tank with a low computational effort, and to investigate the influence of the geometry of four rectangular baffles on the problem of performance. Two computational models based on momentum source and sliding mesh are validated by comparison with experimental results from the literature. For both models, the time-averaged conservation equations of mass, momentum and transport of the mixture are solved using the finite volume method (FVM) (FLUENT<sup>®</sup> v.14.5). The standard <i>k</i>–<i>ε</i> model is used for closure of turbulence. Concerning the geometrical investigation, constructal design is employed to define the search space, degrees of freedom and performance indicators of the problem. More precisely, seven configurations with different width/length (<i>L</i>/<i>B</i>) ratios for the rectangular baffles are studied and compared with an unbaffled case. The momentum source model leads to valid results and significantly reduces the computational effort in comparison with the sliding mesh model. Concerning the design, the results indicate that the case without baffles creates the highest magnitude of turbulence kinetic energy, but poorly distributes it along the domain. The best configuration, (<i>L</i>/<i>B</i>)<sub>o</sub> = 1.0, leads to a mixture performance nearly two times superior than the case without baffles.https://www.mdpi.com/2076-3417/12/10/4827stirred tankmomentum source modelsliding mesh modelcomputational modelingconstructal design |
| spellingShingle | Laísa Luiz Soares Cesare Biserni Roger da Rosa Costa João Américo Aguirre Oliveira Júnior Elizaldo Domingues dos Santos Marcelo Moraes Galarça Numerical Study and Geometric Investigation of the Influence of Rectangular Baffles over the Mixture of Turbulent Flows into Stirred Tanks Applied Sciences stirred tank momentum source model sliding mesh model computational modeling constructal design |
| title | Numerical Study and Geometric Investigation of the Influence of Rectangular Baffles over the Mixture of Turbulent Flows into Stirred Tanks |
| title_full | Numerical Study and Geometric Investigation of the Influence of Rectangular Baffles over the Mixture of Turbulent Flows into Stirred Tanks |
| title_fullStr | Numerical Study and Geometric Investigation of the Influence of Rectangular Baffles over the Mixture of Turbulent Flows into Stirred Tanks |
| title_full_unstemmed | Numerical Study and Geometric Investigation of the Influence of Rectangular Baffles over the Mixture of Turbulent Flows into Stirred Tanks |
| title_short | Numerical Study and Geometric Investigation of the Influence of Rectangular Baffles over the Mixture of Turbulent Flows into Stirred Tanks |
| title_sort | numerical study and geometric investigation of the influence of rectangular baffles over the mixture of turbulent flows into stirred tanks |
| topic | stirred tank momentum source model sliding mesh model computational modeling constructal design |
| url | https://www.mdpi.com/2076-3417/12/10/4827 |
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