Abstract
Detailed simulations of aerated stirred tanks with shear-thinning power law liquids are presented. The lattice-Boltzmann scheme was used to discretize the filtered conservation equations of the liquid phase. The motion of bubbles was tracked based on the Euler-Lagrange approach with a bubble cluster concept. The collision, breakup and coalescence of bubbles were modeled as stochastic events. The predicted flow field of a single-phase stirred tank with shear-thinning power law liquid shows reasonable agreement with experimental data. For aerated systems, qualitatively similar gas holdup distribution was achieved when comparing the predicted result with experiments. Using the proposed modeling approach, it was found that a change in rheology alters the number mean diameter, Sauter diameter and the shape of bubble size distribution. (C) 2012 Elsevier Inc. All rights reserved.
| Original language | English |
|---|---|
| Pages (from-to) | 153-166 |
| Number of pages | 14 |
| Journal | International Journal of Heat and Fluid Flow |
| Volume | 36 |
| Early online date | 11 May 2012 |
| DOIs | |
| Publication status | Published - Aug 2012 |
Bibliographical note
AcknowledgementsThis work was partially funded by Sandoz GmbH, Kundl, Austria and the Research Center Pharmaceutical Engineering, Graz, Austria. Further details of the gas-liquid flow in the reactor and animated results of the dispersion pattern and the liquid velocity field are available upon request.
Keywords
- Computational fluid dynamics
- Lattice-Boltzmann method
- Euler-Lagrange model
- Aerated stirred tank
- Non-Newtonian liquids
- Bubble breakup
- Bubble coalescence
- LATTICE-BOLTZMANN SCHEME
- LARGE-EDDY SIMULATION
- NUMERICAL-SIMULATION
- BUBBLY FLOWS
- FLUID-FLOW
- VESSEL
- CFD
- DISPERSIONS
- REACTORS
- LES