A Resolved Simulation Approach to Investigate the Separation Behavior in Solid Bowl Centrifuges Using Material Functions
The separation of finely dispersed particles from liquids is a basic operation in mechanical process engineering. On an industrial scale, continuously operating decanter centrifuges are often used, whose separation principle is based on the density difference between the solid and the liquid phase d...
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| Format: | Article |
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MDPI AG
2022-09-01
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| Series: | Separations |
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| Online Access: | https://www.mdpi.com/2297-8739/9/9/248 |
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| author | Helene Katharina Baust Simon Hammerich Hartmut König Hermann Nirschl Marco Gleiß |
| author_facet | Helene Katharina Baust Simon Hammerich Hartmut König Hermann Nirschl Marco Gleiß |
| author_sort | Helene Katharina Baust |
| collection | DOAJ |
| description | The separation of finely dispersed particles from liquids is a basic operation in mechanical process engineering. On an industrial scale, continuously operating decanter centrifuges are often used, whose separation principle is based on the density difference between the solid and the liquid phase due to high g-forces acting on both phases. The design of centrifuges is based on the experience on the individual manufacturer or simplified black box models, which only consider a stationary state. Neither the physical behavior of the separation process nor the sediment formation and its transport is considered. In this work, a computationally-efficient approach is proposed to simulate the separation process in decanter centrifuges. Thereby, the open-source computation software OpenFOAM was used to simulate the multiphase flow within the centrifuge. Sedimentation, consolidation of the sediment, and its transport are described by material functions which are derived from experiments. The interactions between the particles and the fluid are considered by locally defined viscosity functions. This work shows that the simulation method is suitable for describing the solid-liquid separation in a simplified test geometry of a decanter centrifuge. In addition, the influence of the rheological behavior on the flow in the test geometry can be observed for the first time. |
| first_indexed | 2024-03-09T22:32:21Z |
| format | Article |
| id | doaj.art-e73d0f9d22214ea6967e25133447199b |
| institution | Directory Open Access Journal |
| issn | 2297-8739 |
| language | English |
| last_indexed | 2024-03-09T22:32:21Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Separations |
| spelling | doaj.art-e73d0f9d22214ea6967e25133447199b2023-11-23T18:54:44ZengMDPI AGSeparations2297-87392022-09-019924810.3390/separations9090248A Resolved Simulation Approach to Investigate the Separation Behavior in Solid Bowl Centrifuges Using Material FunctionsHelene Katharina Baust0Simon Hammerich1Hartmut König2Hermann Nirschl3Marco Gleiß4Institute of Mechanical Process Engineering and Mechanics, Karlsruhe Institute of Technology, Straße am Forum 8, 76131 Karlsruhe, GermanyBASF SE, Carl-Bosch-Strasse 38, 67056 Ludwigshafen am Rhein, GermanyBASF SE, Carl-Bosch-Strasse 38, 67056 Ludwigshafen am Rhein, GermanyInstitute of Mechanical Process Engineering and Mechanics, Karlsruhe Institute of Technology, Straße am Forum 8, 76131 Karlsruhe, GermanyInstitute of Mechanical Process Engineering and Mechanics, Karlsruhe Institute of Technology, Straße am Forum 8, 76131 Karlsruhe, GermanyThe separation of finely dispersed particles from liquids is a basic operation in mechanical process engineering. On an industrial scale, continuously operating decanter centrifuges are often used, whose separation principle is based on the density difference between the solid and the liquid phase due to high g-forces acting on both phases. The design of centrifuges is based on the experience on the individual manufacturer or simplified black box models, which only consider a stationary state. Neither the physical behavior of the separation process nor the sediment formation and its transport is considered. In this work, a computationally-efficient approach is proposed to simulate the separation process in decanter centrifuges. Thereby, the open-source computation software OpenFOAM was used to simulate the multiphase flow within the centrifuge. Sedimentation, consolidation of the sediment, and its transport are described by material functions which are derived from experiments. The interactions between the particles and the fluid are considered by locally defined viscosity functions. This work shows that the simulation method is suitable for describing the solid-liquid separation in a simplified test geometry of a decanter centrifuge. In addition, the influence of the rheological behavior on the flow in the test geometry can be observed for the first time.https://www.mdpi.com/2297-8739/9/9/248solid-liquid separationdecanter centrifugesCFD simulation |
| spellingShingle | Helene Katharina Baust Simon Hammerich Hartmut König Hermann Nirschl Marco Gleiß A Resolved Simulation Approach to Investigate the Separation Behavior in Solid Bowl Centrifuges Using Material Functions Separations solid-liquid separation decanter centrifuges CFD simulation |
| title | A Resolved Simulation Approach to Investigate the Separation Behavior in Solid Bowl Centrifuges Using Material Functions |
| title_full | A Resolved Simulation Approach to Investigate the Separation Behavior in Solid Bowl Centrifuges Using Material Functions |
| title_fullStr | A Resolved Simulation Approach to Investigate the Separation Behavior in Solid Bowl Centrifuges Using Material Functions |
| title_full_unstemmed | A Resolved Simulation Approach to Investigate the Separation Behavior in Solid Bowl Centrifuges Using Material Functions |
| title_short | A Resolved Simulation Approach to Investigate the Separation Behavior in Solid Bowl Centrifuges Using Material Functions |
| title_sort | resolved simulation approach to investigate the separation behavior in solid bowl centrifuges using material functions |
| topic | solid-liquid separation decanter centrifuges CFD simulation |
| url | https://www.mdpi.com/2297-8739/9/9/248 |
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