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Three-dimensional simulation of grain mixing in three different rotating drum designs for solid-state fermentation
M A I Schutyser1, F J Weber, W J Briels
1Wageningen Centre for Food Sciences, P.O. Box 557, The Netherlands. maarten.schutyser@algemeen.pk.wau.nl
Biotechnology and Bioengineering
|July 13, 2002
Summary
A 3D discrete particle simulation model accurately predicts mixing in rotating drums for solid-state fermentation (SSF). Curved baffles significantly enhance radial and axial mixing, suggesting suitability for SSF processes.
Area of Science:
- Engineering
- Biotechnology
- Computational Science
Background:
- Solid-state fermentation (SSF) relies on efficient mixing for optimal performance.
- Previous models focused on 2D radial mixing; a 3D model is needed for comprehensive analysis.
Purpose of the Study:
- Extend a 2D discrete particle model to 3D to predict both radial and axial mixing.
- Evaluate mixing characteristics in rotating drums with different baffle designs (none, straight, curved).
- Validate simulation predictions with experimental data.
Main Methods:
- Developed a three-dimensional discrete particle simulation (DPS) model.
- Simulated mixing in rotating drums with three baffle configurations.
- Conducted experimental studies using video and image analysis to track axial mixing.
Main Results:
- The 3D DPS model adequately predicted radial and axial mixing for drums without baffles and with curved baffles.
- Simulations for drums with straight baffles showed less accuracy and high dependence on particle rotation.
- Drums with curved baffles achieved complete radial and axial mixing in 3-4 rotations, significantly faster than other designs.
Conclusions:
- Discrete particle simulations offer valuable insights into particle transport for optimizing SSF.
- Curved baffles demonstrate superior mixing efficiency, making them highly suitable for SSF applications.
- The 3D model aids in understanding and improving heat and mass transfer in SSF processes.