Analysis of hydrodynamic effects on biofilm thickness in fluidized-bed tapered bioreactors
| Autor: | Leonardo Machado da Rosa, Daniela M. Koerich |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
business.industry Turbulence General Chemical Engineering Flow (psychology) 02 engineering and technology Mechanics Computational fluid dynamics 021001 nanoscience & nanotechnology Physics::Fluid Dynamics Shear (sheet metal) 020401 chemical engineering Fluidized bed Turbulence kinetic energy Fluid dynamics General Materials Science 0204 chemical engineering 0210 nano-technology business Reynolds-averaged Navier–Stokes equations |
| Zdroj: | Particuology. 58:48-57 |
| ISSN: | 1674-2001 |
| DOI: | 10.1016/j.partic.2021.01.011 |
| Popis: | Fluidized beds in tapered geometries provide advantages such as a broad range of optimum operating conditions. However, the dynamics of the flow inside these bioreactors is significantly more complex, as they promote non-uniform bioparticles distribution. To this end, the CFD technique can give a detailed description of the flow in the bioreator. Hence, the aim of this work is to assess the influence of the hydrodynamic on the steady-state biofilm thickness through numerical simulations of liquid–solid fluidized bed. Two geometries of tapered bioreactors in the operating conditions used to develop biofilms. Simulations were run to solve the two-phase RANS equations using the open-source software OpenFOAM in transient-state. The SST k − ω model was used to estimate the turbulent features of the flow. Velocity and bioparticles distribution inside the reactor were analyzed for different inlet velocities, while bioparticles collision frequency and shear stresses were evaluated for various operating conditions. The comparison between the turbulent kinetic energy and the granular temperature indicated that the fluid flow is more turbulent than the bioparticles movement. The hydrodynamics influence on the steady-state biofilm thickness was assessed, and results led to the conclusion that biofilm is more sensitive to hydrodynamic shear stress than bioparticles collisions. |
| Databáze: | OpenAIRE |
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